Forty Years Ago in the Lower Rio Grande Valley: Day Twelve


Back in late May of 1983, four members of the Lancaster County Bird Club—Russ Markert, Harold Morrrin, Steve Santner, and your editor—embarked on an energetic trip to find, observe, and photograph birds in the Lower Rio Grande Valley of Texas.  What follows is a daily account of that two-week-long expedition.  Notes logged by Markert some four decades ago are quoted in italics.  The images are scans of 35 mm color slide photographs taken along the way by your editor.


DAY TWELVE—June 1, 1983

“KOA Hammond, LA”

“We stopped early today — About 2:30 P.M.  Cleaned the interior of the camper, washed the windows, and put everything where it belonged.  The windshield was a buggy mess.  Had supper according to the menu.  Took pictures of the place.  Had a shower.  Loafed all evening.”

After being on the go for twelve to sixteen hours a day for more than a week, it was nice to catch up on our “housekeeping”, field notes, and rest.  The campground, which was yet another nearly empty one, had an in-ground pool, so I decided to go for a swim.  As I went through the gate, I noticed that the water was a little bit dull, not sparkling clear as if treated by the usual dose of chemicals.  Upon getting closer, I could see what looked like a layer of mulm at the bottom of the pool, similar to the detritus and waste that accumulates atop the substrate in an otherwise clear aquarium tank.  Needless to say, I postponed the swim.  Later, when we happened to be in the office, I asked the owners about the pool and was momentarily puzzled when they told us that the entire campground had been flooded last month.  This was at first surprising because no stream, creek, or river was in sight, but the land is so flat and the elevation so uniform in southwestern Louisiana that a couple of feet of water can inundate miles and miles of these lowlands.  As on a beach or on a delta, building anything of value in a floodplain is risky business.

On June 2, we resumed our drive, then spent the night at the KOA campground in Sweetwater, Tennessee, at the same accommodations we visited while southbound on May 21.  There, I finally had my refreshing swim.  By the following evening, June 3, we had arrived back in Lancaster County, Pennsylvania.  During the trip from the Brownsville Airport to Lititz, Pennsylvania, the odometer had registered 1,945 miles.

This then, prompted and fortified by the notes kept by Russ Markert, have been your editor’s recollections from his ever-evaporating river of memories of an adventure forty years gone.  I hope you’ve enjoyed this modern-style slide show describing our journey to the Lower Rio Grande Valley.  I’m grateful to each of my traveling companions for inviting me to share this experience with them and am equally glad to have had the opportunity to share the story of our trip with you.

If traveling to see the wildlife and plant communities of south Texas seems like something that might interest you, I strongly urge you to go.  Many more tropical species, including native parrots, are now found north of the border and the opportunity to see vagrants is still better there than anywhere else in the country.  The hundreds of species of butterflies and the spectacular migrations of the Neotropical birds that nest here in the the higher latitudes make it a place you need to visit at least once in a lifetime.  The cooler months of the year can be a comfortable time to make the trip.  You’ll see wintering birds from both eastern and western portions of the United States and Canada, some in numbers that might amaze you.

If the Lower Rio Grande Valley is something outside your means, then may I suggest a visit to ZooAmerica in Hershey, Pennsylvania.  The theme of the collection is North American wildlife and the self-guided tour is organized by regional habitat types including the southern swamps and the southwestern deserts and scrubland.  Some of the animals we saw on our expedition, and some that we missed, are among the species under their care.

Western Diamondback Rattlesnake
The Western Diamondback Rattlesnake (Crotalus atrox) is a resident of the Texas scrublands and deserts.  Unless you’re looking for trouble by recklessly wading through the thornscrub, the only time you might get lucky enough to find one in the Lower Rio Grande Valley is late in the day when they emerge from hiding to enjoy the warmth of a quiet road or other sun-drenched surface.  We weren’t that fortunate, so I photographed this one in the desert southwest exhibit at ZooAmerica in Hershey, Pennsylvania.  (A modern digital image)
Burrowing Owls
You can see these Burrowing Owls (Athene cunicularia), a rare but regular wintering species in the Lower Rio Grande Valley, among the cacti in the desert southwest exhibit at ZooAmerica.  (Another modern digital image)

That’s it folks.  Until next time, adiós amigos.

 


 

IN MEMORIAM

J. E. Russel Markert (1912-1984)

Harold B. Morrin (1924-2012)

Steven J. Santner (1948-2021)

 


 

Forty Years Ago in the Lower Rio Grande Valley: Day Five


Back in late May of 1983, four members of the Lancaster County Bird Club—Russ Markert, Harold Morrrin, Steve Santner, and your editor—embarked on an energetic trip to find, observe, and photograph birds in the Lower Rio Grande Valley of Texas.  What follows is a daily account of that two-week-long expedition.  Notes logged by Markert some four decades ago are quoted in italics.  The images are scans of 35 mm color slide photographs taken along the way by your editor.


DAY FIVE—May 25, 1983

Bentsen State Park, Texas

Went to bed last nite about 11:30.  Did not set the alarm.  Very hot — Awoke at 7:30 A.M.  We circled the campground and then drove to the river trail.  We walked to the river, getting more lifers for Larry — Couch’s Kingbird, Olive Sparrow, and Groove-billed Ani.  The Couch’s Kingbird is my first lifer of the trip.  The Olive Sparrow has the same cadence as the Tennessee Warbler.  We then checked the resaca and found a Least Bittern.

While checking out the cattails at the resaca, we failed to catch a glimpse of a Coues’ Rice Rat (Oryzomys couesi), a semi-aquatic mammal that lives only in the Rio Grande Valley and areas south into Central America.  Instead we found an Eastern Fox Squirrel (Sciurus niger), a giant compared to the gray squirrels in Pennsylvania.  Things really are bigger in Texas.

Couch's Kingbird
This Couch’s Kingbird (Tyrannus couchii) was a “lifer” for both Russ and your editor; neither of us had ever seen one before.  (Vintage 35 mm image)

Back to our camp site for lunch, after paying for our stay at the office.  P.M. — Put out corn and sunflower seeds and loafed all P.M. trying to get pictures.  Larry had a lot of luck.  I did not do so good.

Plain Chachalacas, White-winged Doves, White-tipped Doves, Great-tailed Grackles, and a Bronzed Cowbird stopped by to sample the seed offerings.  The chachalacas and grackles created quite a racket.  It’s a good thing we didn’t have any neighbors close by!

Great-tailed Grackles
Great-tailed Grackles visit Russ’ makeshift feeding station.  These giants are 50% larger than the Common Grackles with which I was familiar.  Yes, even the blackbirds are bigger in Texas.  (Vintage 35 mm image)
Bronzed Cowbird
A Bronzed Cowbird picks up some seed morsels.  (Vintage 35 mm image)

In nearby areas of the campground there were many species—Black-bellied Whistling Duck, Anhinga, Great Egret, Common Gallinule, Turkey Vulture, Yellow-billed Cuckoo, Golden-fronted Woodpecker, Ladder-backed Woodpecker, Eastern Kingbird, Brown-crested Flycatcher, Curve-billed Thrasher, Long-billed Thrasher (Toxostoma longirostre), Altamira Oriole, and Northern Cardinal.

Golden-fronted Woodpecker
A Golden-fronted Woodpecker peers from its nest cavity.  (Vintage 35 mm image)
Long-billed Thrasher
The two thrasher species found in the campground highlighted the mix of two unique habitats.  The Curve-billed Thrasher is a species of scrubland while this Long-billed Thrasher is more typically an inhabitant of bottomlands.  (Vintage 35 mm image)

Rain is rare here — The rainy season produced no rain.  Now a light rain is falling.  The temperature dropped to 90° in the camper.  One couple wanted to see anis.  Larry picked one out 50 ft. from their campsite.

Groove-billed Ani
The Groove-billed Ani (Crotophaga sulcirostris) is a large-billed relative of the cuckoos.  Because it is totally black in color, it can be very difficult to spot among the dense foliage where it typically feeds.  It ranges north from Mexico only into south Texas.  (Vintage 35 mm image)

The rain cooled the air to make the evening tolerable, but we would pay for it tomorrow with an increase in the humidity.

Green Jay
A Green Jay during the evening rain.  (Vintage 35 mm image)

We paid for another nite and at dusk went to the Elf Owl tree where eventually 4 young came out and tried their wings and crawled around.  The two adults flew in and Larry was ecstatic taking pictures with his strobe light.  We met some people.  One couple never saw Eastern Bluebirds.  I gave him my card.  Another couple pinpointed the owl tree.

This evening was certainly highlighted by the emergence of the young Elf Owls (Micrathene whitneyi) from their nest cavity.  But in addition, we again heard the sounds of some of the other nocturnal birds found in the park—Common Nighthawk, Common Pauraque, and Eastern Screech Owl.

Elf Owls
The Elf Owl is a species of desert bottomlands and canyons throughout southwestern portions of the United States and northwestern Mexico.  Bentsen-Rio Grande State Park and the adjacent areas of Hidalgo County, Texas, are about as far east as they get.  Look closely and you may discern two juveniles emerging from their nest cavity in a large tree.  (Vintage 35 mm image)
Juvenile Elf Owls
Juvenile Elf Owls checking out the visitors.  (Vintage 35 mm image)
Juvenile Elf Owls
Juvenile Elf Owls having a look around.  (Vintage 35 mm image)
Elf Owl
One of the adult Elf Owls arrives.  In the desert, these tiny owls often nest and roost in a hollow portion of a standing cactus.  (Vintage 35 mm image)
Juvenile Elf Owl
One of four juvenile Elf Owls seen at the Bentsen-Rio Grande Valley State Park nest site.  (Vintage 35 mm image)

Are Your Eggs All They’re Cracked Up To Be?

Looks like I’m gonna be in the doghouse again—this time by way of the hen house.  But why should I care?  Here we go.

A few weeks ago, back when eggs were still selling for less than five dollars a dozen, the Pennsylvania Department of Agriculture renewed calls for owners and caretakers of outdoor flocks of domestic poultry (backyard chickens) to keep their birds indoors to protect them from the spread of  bird flu—specifically “Highly Pathogenic Avian Influenza” (H.P.A.I.).  At least one story edited and broadcast by a Susquehanna valley news outlet gave the impression that “vultures and hawks” are responsible for the spread of avian flu in chickens.  To see if recent history supports such a deduction, let’s have a look at the U.S.D.A.’s Animal and Plant Health Inspection Service’s 2022-2023 list of the  detection of Highly Pathogenic Avian Influenza in birds affected in counties of the Lower Susquehanna River Watershed in Pennsylvania.

H.P.A.I. 2022 Confirmed Detections as of January 13, 2023

This listing includes date of detection, county of collection, type/species of bird, and number of birds affected.  WOAH (World Organization for Animal Health) birds include backyard poultry, game birds raised for eventual release, domestic pet species, etc.

12/30/2022  Adams            Black Vulture

12/15/2022   Lancaster     Canada Goose

12/15/2022   Lebanon        Black Vulture

12/15/2022   Adams            Black Vulture (3)

11/8/2022     Cumberland Black Vulture (4)

11/4/2022      Dauphin         WOAH Non-Poultry (130)

10/19/2022   Dauphin         Captive Wild Rhea (4)

10/17/2022   Adams            Commercial Turkey (15,100)

10/11/2022    Adams            WOAH Poultry (2,800)

9/30/2022    Lancaster      Mallard

9/30/2022    Lancaster      Mallard

9/29/2022     Lancaster     WOAH Non-Poultry (180)

9/29/2022     York                 Commercial Turkey (25,900)

8/24/2022     Dauphin         Captive Wild Crane

7/15/2022      Lancaster     Great Horned Owl

7/15/2022      York                 Bald Eagle

7/15/2022      Dauphin         Bald Eagle

6/16/2022      Dauphin         Black Vulture

6/16/2022      Dauphin         Black Vulture (4)

5/31/2022      Lancaster      Black Vulture (2)

5/31/2022      Lancaster      Black Vulture

5/10/2022-Lncstr-Commercial Egg Layer (72,300)

4/29/2022-Lncstr-Commercial Duck (19,300)

4/27/2022-Lncstr-Commercial Broiler (18,100)

4/26/2022-Lncstr-Commercial Egg Layer (307,400)

4/22/2022-Lncstr-Commercial Broiler (50,300)

4/20/2022-Lncstr-Commercial Egg Layer (1,127,700)

4/20/2022-Lncstr-Commercial Egg Layer (879,400)

4/15/2022-Lncstr-Commercial Egg Layer (1,380,500)

In the Lower Susquehanna River Watershed, it’s pretty obvious that the outbreak of avian flu got its foothold inside some of the area’s big commercial poultry houses.  Common sense tells us that hawks, vultures, and other birds didn’t migrate north into the Lower Susquehanna River Watershed carrying bird flu, then kick in the doors of the enclosed hen houses to infect the flocks of chickens therein.   Anyone paying attention during these past three years knows that isolation and quarantine are practices more easily proposed than sustained.  Human footprints are all over the introduction of this infection into these enormous flocks.  Simply put, men don’t wipe their feet when no one is watching!  The outbreak of bird flu in these large operations was brought under control quickly, but not until teams of state and federal experts arrived to assure proper sanitary and isolation practices were being implemented and used religiously to prevent contaminated equipment, clothing, vehicles, feed deliveries, and feet from transporting virus to unaffected facilities.  Large poultry houses aren’t ideal enclosures with absolute capabilities for excluding or containing viruses and other pathogens.  Exhaust systems often blow feathers and waste particulates into the air surrounding these sites and present the opportunity for flu to be transported by wind or service vehicles and other conveyances that pass through contaminated ground then move on to other sites—both commercial and non-commercial.  Waste material and birds (both dead and alive) removed from commercial poultry buildings can spread contamination during transport and after deposition.  The sheer volume of the potentially infected organic material involved in these large poultry operations makes absolute containment of an outbreak nearly impossible.

A farm with a biosecurity perimeter or control area.  (United States Department of Agriculture Animal and Plant Inspection Service image)
A U.S.D.A. Animal and Plant Inspection Service Veterinary Services employee decontaminates footwear at the entrance to a biosecurity zone.  (United States Department of Agriculture Animal and Plant Inspection Service image)

Looking at the timeline created by the list of U.S.D.A. detections, the opportunity for bird flu to leave the commercial poultry loop probably happened when wild birds gained access to stored or disposed waste and dead animals from an infected commercial poultry operation.  For decades now, many poultry operations have dumped dead birds outside their buildings where they are consumed by carrion-eating mammals, crows, vultures, Bald Eagles, and Red-tailed Hawks.  For these species, discarded livestock is one of the few remaining food sources in portions of the Lower Susquehanna River Watershed where high-intensity farming has eliminated other forms of sustenance.  They will travel many miles and gather in unnatural concentrations to feast on these handouts—creating ideal circumstances for the spread of disease.

The sequence of events indicated by the U.S.D.A. list would lead us to infer that vultures and Bald Eagles were quick to find and consume dead birds infected with H5N1—either wild species such as waterfowl or more likely domestic poultry from commercial operations or from infectious backyard flocks that went undetected.  As the report shows, Black Vultures in particular seem to be susceptible to morbidity.  Their frequent occurrence as victims highlights the need to dispose of potentially infectious poultry carcasses properly—allowing no access for hungry wildlife including scavengers.

Black Vultures
Black Vultures and other scavengers including Bald Eagles are attracted to improperly discarded poultry carcasses and will often loiter in areas where dumping occurs.

The positive test on a Great Horned Owl is an interesting case.  While the owl may have consumed an infected wild bird such as a crow, there is the possibility that it consumed or contacted a mammalian scavenger that was carrying the virus.  Aside from rodents and other small mammals, Great Horned Owls also prey upon Striped Skunks with some regularity.  Most of the dead poultry from flu-infected commercial flocks was buried onsite in rows of above-ground mounds.  Skunks sniff the ground for subterranean fare, digging up invertebrates and other food.  Buried chickens at a flu disposal site would constitute a feast for these opportunistic foragers.  A skunk would have no trouble at all finding at least a few edible scraps at such a site.  Then a Great Horned Owl could easily seize and feed upon such a flu virus-contaminated skunk.

Striped Skunk
Striped Skunks and many other mammals are readily attracted by improperly discarded poultry carcasses.

BACKYARD POULTRY

Before we proceed, the reader must understand the seldom-stated and never advertised mission of the Pennsylvania Department of Agriculture—to protect the state’s agriculture industry.  That’s it; that’s the bottom line.  Regulation and enforcement of matters under the purview of the agency have their roots in this goal.  While they may also protect the public health, animal health, and other niceties, the underlying purpose of their existence in its current manifestation is to protect the agriculture industry(s) as a whole.

This is not a trait unique to the Pennsylvania Department of Agriculture.  It is at the core of many other federal and state agencies as well.  Following the publication of Upton Sinclair’s The Jungle in 1906, a novel decrying “wage slavery” in the meat packing industry, the federal government took action, not for the purpose of improving the working conditions for labor, but to address the unsanitary food-handling practices described in the book by creating an inspection program to restore consumer confidence in the commercially-processed meat supply so that the industry would not crumble.

Locally, few things make the dairy industry and the Pennsylvania Department of Agriculture more nervous than small producers selling “raw milk”.  In the days before pasteurization and refrigeration, people were frequently sickened and some even died from drinking bacteria-contaminated “raw milk”.  In Pennsylvania, the production and sale of dairy products including “raw milk” is closely regulated and requires a permit.  Retention of a permit requires submitting to inspections and passing periodic herd and product testing.  Despite the dangers, many consumers continue to buy “raw milk” from farms without permits.  These sales are like a ticking time bomb.  The bad publicity from an outbreak of food-borne illness traced back to a dairy product—even if it originated in an “outlaw” operation—could decimate sales throughout the industry.  Because just one sloppy farm selling “raw milk” could instantly erode consumer confidence and cause an industry-wide collapse of the market resulting in a loss of millions of dollars in sales, it is a deeply concerning issue.

Enter the backyard chicken—a two-fold source of anxiety for the poultry industry and its regulators.  Like unregulated meat and dairy products, eggs and meat from backyard poultry flocks are often marketed without being monitored for the pathogens responsible for the transmission of food-borne illness.  From the viewpoint of the poultry industry, this situation poses a human health risk that in the event of an outbreak, could erode consumer confidence, not only in homegrown organic and free-range products, but in the commercial line of products as well.  Consumers can be very reactive upon hearing news of an outbreak, recalling few details other than “the fowl is foul”— then refraining from buying poultry products.  The second and currently most concerning source of trepidation among members of the poultry industry though is the threat of avian flu and other diseases being harbored in and transmitted via flocks of backyard birds.

The Green Revolution, the post-World War II initiative that integrated technology into agriculture to increase yields and assure an adequate food supply for the growing global population, brought changes to the way farmers raised poultry for market.  Small-scale poultry husbandry slowly disappeared from many farms.  Instead, commercial operations concentrated birds into progressively-larger indoor flocks to provide economy of scale.  Over time, genetics and nutrition science have provided the American consumer with a line of readily available high-quality poultry products at an inexpensive price.  Within these large-scale operations, poultry health is closely monitored.  Though these enclosures may house hundreds of thousands of birds, the strategy during an outbreak of communicable disease is to contain an outbreak to the flock therein, writing it off so to speak to prevent the pathogens from finding their way into the remainder of the population in a geographic area, thus saving the industry at the expense of the contents of a single operation.  Adherence to effective biosecurity practices can contain outbreaks in this way.

An offshoot of the Green Revolution, a large-scale poultry operation.
Modern science has produced a genetic map of the domestic chicken (Gallus gallus domesticus) allowing faster development of varieties with improved disease resistance, productivity, and other traits.  (United States Department of Agriculture image by Peggy Greb)
A technician checks eggs produced by immunized birds for the presence of flu virus.  A flu vaccine could provide an added layer of protection to biosecurity in the poultry industry.  (United States Department of Agriculture image by Stephen Ausmus)

The renewed popularity of backyard poultry is a reversal of the decades-long trend towards reliance on ever-larger indoor operations for the production of birds and eggs.  But backyard flocks may make less-than-ideal neighbors for commercial operations, particularly when birds are left to roam outdoors.  Visitors to properties with roaming chickens, ducks, geese, and turkeys may pick up contamination on their shoes, clothing, tires, and equipment, then transmit the pathogenic material to flocks at other sites they visit without ever knowing it.  Even the letter carrier can carry virus from a mud puddle on an infected farm to a grazing area on a previously unaffected one.  Unlike commercial operations, hobby farms frequently buy, sell, and trade livestock and eggs without regard to disease transmission.  The rate of infection in these operations is always something of a mystery.  No state or county permits are required for keeping small numbers of poultry and outbreaks like avian flu are seldom reported by caretakers of flocks of home-raised birds, though their occurrence among them may be widespread.  The potential for pathogens like avian flu virus circulating long-term among flocks of backyard poultry in close proximity to commercial houses is a real threat to the industry.

Live poultry and eggs are frequently sold to and traded among operators of backyard flocks without monitoring for disease.  (United States Department of Agriculture image by Keith Weller.)

There are a variety of motivations for tending backyard poultry.  While for some it is merely a form of pet keeping, others are more serious about the practice—raising and breeding exotic varieties for show and trade.  Increasingly, backyard flocks are being established by people seeking to provide their own source of eggs or meat.  For those with larger home operations,  supplemental income is derived from selling their surplus poultry products.  Many of these backyard enthusiasts are part of a movement founded on the belief that, in comparison to commercially reared birds, their poultry is raised under healthier and more humane conditions by roaming outdoors.  Organic operators believe their eggs and meat are safer for consumption—produced without the use of chemicals.  For the movement’s most dedicated “true believers”, the big poultry industry is the antagonist and homegrown fowl is the only hope.  It’s similar to the perspective members of the “raw milk” movement have toward pasteurized milk.  True believers are often willing to risk their health and well-being for the sake of the cause, so questioning the validity of their movement can render a skeptic persona non grata.

What’s in your eggs?  (United States Department of Agriculture image by Peggy Greb)

For the consumer, the question arises, “Are eggs and poultry from the small-scale operations better?”

While many health-conscious animal-friendly consumers would agree to support the small producer from the local farm ahead of big business, the reality of supplying food for the masses requires the economy of scale.  The billions of people in the world can’t be fed using small-scale and/or organic growing methods.  The Green Revolution has provided record-high yields by incorporating herbicides, insecticides, plastic, and genetic modification into agriculture.  To protect livestock and improve productivity, enormous indoor operations are increasingly common.  Current economics tell the story—organic production can’t keep up with demand, that’s why the prices for items labelled organic are so much higher.

A commercial poultry operation (in this case turkeys) produces economical consumer products.  (United States Department of Agriculture image by Scott Bauer)

To the consumer, buying poultry raised outdoors is an appealing option.  Compared to livestock crowded into buildings, they feel good about choosing products from small operations where birds roam free and happy in the sunshine.

An outdoor flock of backyard chickens.  (United States Department of Agriculture Animal and Plant Inspection Service image)

But is the quality really better?  Some research indicates not.  Salmonella outbreaks have been traced back to poultry meat sourced from small unregulated operations.  Studies have found dioxins in eggs produced by hens left to forage outdoors.  The common practice of burning trash can generate a quantity of ash sufficient to contaminate soils with dioxins, chemical compounds which persist in the environment and in the fatty tissue of animals for years.  The presence of elevated levels of dioxins in eggs from outdoor grazing operations may pose a potential consumer confidence liability for the entire egg industry.

Birds raised or kept in an outdoor zoo or backyard poultry setting can be susceptible to viruses and other pathogens when wild birds including vultures and hawks become attracted to the captives’ food and water when it is placed in an accessible location.  In addition, hunting and scavenging birds are opportunistic— attracted to potential food animals when they perceive vulnerability.  Selective breeding under domestication has rendered food poultry fat, dumb, and too genetically impaired for survival in the wild.  These weaknesses instantly arouse the curiosity of raptors and other predators whose function in the food web is to maintain a healthy population of animals at lower tiers of the food chain by selectively consuming the sickly and weak.  In settings such as those created by high-intensity agriculture and urbanization, wild birds may find the potential food sources offered by outdoor zoos and backyard poultry irresistible.  As a result they may perch, loaf, and linger around these locations—potentially exposing the captive birds to their droppings and transmission of bird flu and other diseases.

Variation produced under domestication has left poultry unfit for life among the perils found outdoors.  (United States Department of Agriculture image)
Turkey Vulture and White-tailed Deer
Millions of years of natural selection have made scavengers and predators ideally suited for the role of detecting and consuming dead, dying, and diseased wild animals, thus reducing accumulations of rotting carcasses and the spread of infectious pathogens among prey species.  Their distribution and reproductive success is closely controlled by the availability of food.  Humans need not disturb this balance or create unnatural congregations of these animals by providing supplemental foods such as dead poultry.

While outdoor poultry operations usually raise far fewer birds than their commercial counterparts, their animals are still kept in densities high enough to promote the rapid spread of microbiological diseases.  Clusters of outdoor flocks can become a reservoir of pathogens with the capability of repeatedly circulating disease into populations of wild birds and even into commercial poultry operations—threatening the industry and food supply for millions of people.  For this reason, state and federal agencies are encouraging operators to keep backyard poultry indoors—segregated from natural and anthropogenic disease vectors and conveyances that might otherwise visit and interact with the flock.

BACK TO THE FUTURE?—NOT LIKELY

The hobby farmer, the homesteader, the pet keeper, and the consumer seldom realize what the modern farmer is coming to know—domestic livestock must be segregated from the sources of contamination and disease that occur outdoors.  Adherence to this simple concept helps assure improved health for the animals and a safer food supply for consumers.  In the future, outdoor production of domestic animals, particularly those used as a food supply, is likely to be classified as an outdated and antiquated form of animal husbandry.

Outside and Inside Animals
It’s as simple as ABC and 123.
Cage-free chickens can be housed within the protective envelop of a building where they can be segregated from the microbes and pollutants found outdoors.  The U.S.D.A. defines “free-range” poultry as birds with some access to an outdoor setting where the benefits of biosecurity and quarantine are, for all intents and purposes, nullified.  (United States Department of Agriculture image by Stephen Ausmus)
Pigs
Pigs raised outdoors by homesteaders and hobby farmers pose the threat of spreading a number of diseases including Swine Fevers and Brucellosis into pork industry operations.   Escaped individuals are often attracted to commercial hog houses where they can loiter outside and contaminate the ground surrounding entrance ways used by personnel tending the animals.  Like other domestic animals, pigs should be contained inside buildings for biosecurity.
Dairy cows in an indoor feed lot.
Dairy cows and other cattle raised within well-designed indoor and semi-indoor settings are less prone to injury and consumption of contaminated foods and water.
Domestic Cat
Domestic Cats (Felis catus), particularly when allowed to roam outdoors, can contract the parasite Toxoplasma gondii during interactions with mice.  Humans, dogs, pigs, and other animals coming in contact with the Toxoplasma oocysts shed in feline feces can contract Toxoplasmosis, a disease with various physical and mental health symptoms.  According to the Centers for Disease Control, there are approximately three million cases of Toxoplasmosis among humans in the United States annually.

THE THREAT FROM PRIONS

If there are three things the world learned from the SARS CoV-2 (Covid-19) epidemic, it’s that 1) eating or handling bush meat can bring unwanted surprises, 2) dense populations of very mobile humans are ideal mediums for uncontrolled transmission of disease, and 3) quarantine is easier said than done.

If you think viruses are bad, you don’t even want to know about prions.  Prions are a prime example of why now is a good time to begin housing domestic animals, including pets, indoors to segregate them from wildlife.  And prions are a good example of why we really ought to think twice about relying on wild animals as a source of food.  Prions may make us completely rethink the way we interact with animals of any kind—but we had better do our thinking fast because prions turn the brains of their victims into Swiss cheese.

Stained slide of cow brain tissue affected by Bovine Spongiform Encephalopathy (BSE). The pale-colored air pockets are voids in the tissue caused by the disease.  (United States Department of Agriculture image by the late Dr. Al Jenny)

Diseases caused by prions are rapidly progressing neurodegenerative disorders for which there is no cure.  Prions are an abnormal isoform of a cellular glycoprotein.  They are currently rare, but prions, because they are not living entities, possess the ability to begin accumulating in the environment.  They not only remain in detritus left behind by the decaying carcasses of afflicted animals, but can also be shed in manure—entering soils and becoming more and more prevalent over time.  Some are speculating that they could wind up being man’s downfall.

The  Centers for Disease Control lists these human afflictions caused by prions…

The Centers for Disease Control lists these prion-caused ailments of other animals…

Dairy cows in a pasture.
Bovine Spongiform Encephalopathy (BSE), also known as Mad Cow Disease, is a neurodegenerative disorder fatal to cattle.  It is caused by the same prion that, when consumed or otherwise contracted by humans, causes Creutzfekd-Jokob Disease (CJD).
Chronic Wasting Disease (CWD), a fatal disease caused by a prion, is currently spreading among populations of the White-tailed Deity in the mid-Atlantic region.  Prions are understood to be folded proteins, not living things, thus they are not destroyed by cooking and other disinfection practices.  If you are wondering whether various forms of these pathogens will begin accumulating in the environment and affecting more and more species with new and more frightening afflictions, well, time will tell.  Meanwhile, we at susquehannawildlife.net are staying away from “game” and any other form of bush meat.  Thanks, but no thanks!
The future with a safe food supply will require domestic animals to be contained indoors while wildlife roams unmolested outdoors.

SOURCES

Schoeters, Greet, and Ron Hoogenboom.  2006.  Contamination of Free-range Chicken Eggs with Dioxins and Dioxin-like Polychlorinated Biphenyls.  Molecular Nutrition and Food Research.  (10):908-14.

Szczepan, Mikolajczyk, Marek Pajurek, Malgorzata Warenik-Bany, and Sebastian Maszewski.  2021.  Environmental Contamination of Free-range Hen with Dioxin.  Journal of Veterinary Research.  65(2):225-229.

U.S.D.A. Animal and Plant Inspection Service.  2022 Confirmations of Highly Pathogenic Avian Influenza.  aphis.usda.gov/aphis/ourfocus/animalhealth/animal-disease-information/avian/avian-influenza/hpai-2022/2022-hpai-commercial-backyard-flocks as accessed January 14, 2023.

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Photo of the Day

Birds of Conewago Falls in the Lower Susquehanna River Watershed: Great Horned Owl
This juvenile Great Horned Owl and its sibling have attained their first set of flight feathers and left the nest.  The duo is still being watched and fed by their parents, which remain hidden in a nearby woodlot.