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Hey Frank1
This is a very good question.
There are two type of vegans :
The Plant based one, they are "in" for the benefits to the health of their body. Probably too for the reduction of pollution and the better carbon footprint.
The "animals lives matter" ones, those guys are in claiming that every single animal life matter. Which isn't wrong, and make sense but the human species has always relied on animals to survive / evolve (silk, wool, leather, farm animal). Where those get a little bit hypocritical sometime is that they would buy an iphone or nike shoes made by a 10 year old children paid 2$ / day. Children are animals too.
Anyway, now that i have laid this very basic explanation of the two type of vegan (according to my views, happy to discuss the veracity). what would happen to all the animals ?
Chicken ?
Hen lay eggs everyday, but not all eggs are fertilized by a rooster.
Not all eggs survive, rodents eat eggs, then small chicks are being eaten by fox and other predators.
And finally, the reason we have millions and milions of hens/chicken is due to heavy farming.
If you look into the wild, you don't see that many chicken roaming wild. I guess at first human will have to play god and reduce the number of chicken by not replacing the ones being eaten by none vegan (no one believe that the world will just wake up vegan, it will take years, chicken can live up to 10 years, surely we have 10 years of chicken resources for the people that want an extension of time before becoming vegan).
Then all of a sudden, no need for chicken, plenty of space for chicken to roam free. Why not releasing the chicken in the field, they are very good at eating parasite within crops, they also fertilize crops with their manure. Farmers would save on chemicals and...
Dog and Cats, I don't think that vegans are against nutting cats and dogs.
Cows ? same as with the chickens, (except releasing them in crops haha). Without the need to artificially inseminate them, there would less cows, and they wouldn't be in the city centers. They would be in the wild. doing cow stuff.
Off course there would be some example of cow on the road causing accidents and stuff, but no solution is perfect.
Look at India, cows are goddess there. They do what they want, but you can't really say that they are over populated.
And when a cow is too old, she dies, and a predator will eat it. (could be an eagle / a cougar ... same fate as dead antelope in africa).
Sheep, vegans are probably not against cutting the wool of wild sheep to prevent them of over heating.
Vegans may even agree that sheep could be "farmed" if they had like 500 m2 of green pasture per animal, no killing of their offspring, no artificial insemination and wool trimming once a year. Basically sheep almost roaming free on large body of land, and being left alone except for the yearly wool collection. No harm there.
Plenty of countries in the world that have excess of green pasture.
Regarding the pest, well it is a hard one.
Maybe that we have a separate way to deal with them.
Maybe we continue to use pest control, maybe a memorandum will say that for the greater good, pest must be controlled.
After all, we jail human because they do bad things to the environment or other human.
It could be the same for pest.
What do you think ?
The damage would be tremendous.
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Not mentioning they would live in pain, since cows for example require milking otherwise they will experience great pain and vegans do not drink dairy products.
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Cows only have milk if they have a calf, once the calf is big enough to eat grass, the mother cow stops making milk.
In the modern farming industry, cow are artificially inseminated so they have babies (calves) every year and produce milk all the time.
Once they calf is born, he is being sent to a shredder (alive) and sent to trash.
This wouldn't happen in a world where cows are free.