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Texas hunting

Started by Texas Ranger, October 10, 2022, 04:46:41 PM

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barbender

WV- "modern problems require modern solutions"😂

It is a real head scratcher how some animals you can't keep their populations from exploding, and others even with very intense management it is difficult to maintain healthy populations.

 I've read that coyotes respond to lower coyote numbers by having bigger litters. Almost the harder you hunt them, the more you end up with. I wonder if pigs do the same?
Too many irons in the fire

Southside

It's not that they have more pups, it's that more pups survive because there is less competition for their preferred food source so they have improved odds of making it. 
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Ianab

Quote from: barbender on October 16, 2022, 04:13:16 PMI've read that coyotes respond to lower coyote numbers by having bigger litters. Almost the harder you hunt them, the more you end up with. I wonder if pigs do the same?


Less animals means more food for the few that are there, so possibly bigger litters and better survival for the young-uns. Conversely a dense population probably limits food, and reduces the breeding success. 

Of course pigs being smart, a shortage of food would encourage them to move to new territory.

The issue with endangered animals is often an introduced predator or competitor. This either simply eats the endangered species, or eats it's food supply. Someone mentioned how pigs hit the ground nesting game birds (turkeys etc). Too many pigs running around and you might find turkeys become endangered?  Most of the NZ conservation efforts revolve around controlling introduced predators (like pigs, rats and stoats), or species that are basically eating the forest (goats and Aussie possums). Take away those introduced problems (in a fenced reserve or Island etc) and the otherwise endangered animals breed normally and build up their numbers. 

Kiwi birds for example only lay one large egg, and if there are stoats or ferrets in the area the survival rate is less than 10%. As you can imagine that's a quick road to extinction. But remove the predators and survival is 80-90%, so after a few years numbers soon build up again. The local fenced reserve is having to rehome kiwi birds to other areas, with decent pest control, but still some risk. The adult birds can defend themselves, but young chicks are sitting ducks. 
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WV Sawmiller

BB,

  Good point. We learned in wildlife biology classes about the larger litter sizes and the females will breed at earlier ages and sometimes have more litters. That generally assumes habitat conditions are at or near ideal and populations are low.

  The basic tenant of wildlife biology is manage the habitat for the target animal. That includes food, nesting/denning conditions are met and in some cases predator control and initial stocking/re-stocking may be required.

  As Jake mentioned species like feral pigs are deadly on ground nesting birds like quail and turkeys. Quail were already seriously threatened by fire ants where they have been introduced. Ground reared mammals like fawns and rabbits are at great risk. Even snakes and turtles are at risk. If the pythons in the Everglades had legs and hair, they would be feral pigs.
Howard Green
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"Feral pigs are known carriers of at least 45 different parasites (external and internal) and diseases (bacterial and viral) that pose a threat to domestic livestock, pets, wildlife and human health. The threat of disease transmission from feral pigs to domestic livestock is a major concern to the farming industry.
Several of these diseases are swine specific (both feral and domestic) but others can affect cattle, sheep, goats, dogs, horses and several species of native wild mammals. Infectious diseases that are significant to livestock include: Pseudorabies Virus (PRV)
Swine brucellosis (Brucella suis)
Bovine tuberculosis (TB)
Foot & Mouth Disease
African swine fever and Classical swine fever (Hog Cholera)
Zoonotic diseases transmissible from feral pigs to humans include:
Leptospirosis,
Brucellosis, E. coli,
Salmonellosis,
Toxoplasmosis,
Rabies,
Swine Influenza viruses,
Trichinosis,
Giardiasis and Cryptosporidiosis.
 
Agricultural practices or irrigation.  Irrigation pivot pulls water from a fecal e-coli infected water source and irrigates a spinach field. Consumer purchases the spinach from a local grocery store and eats it without thoroughly washing, then gets sick or dies from e-coli bacteria. This scenario already happened in California where ignorant people protect feral swine while suing farmers for allowing e-coli in their food.
 
Reproduction: A single sow (female) will produce two litters of six to 10 pigs annually and their offspring will reach sexual maturity in six to eight months of age. 100 sows can escalate to 1,600 pigs (100 x 16) in one year. Feral pigs destroy agricultural fields just as termites destroy residential homes. A farmer has the same right to remove feral swine from their fields as your right to remove termites from your home. Insect versus mammal makes no difference to the legal definition of a pest when public health, property damage and disease is concerned."

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