No, they are not born with nipples.
Donkeys have nine (9) nipples. Not sure about the horse.
You should, to ensure that the male (if he is intact) will not try to mate with the Jenny. Some donkeys and horses are aggressive to the females while mating.
Intact male donkeys are called Jacks.
They are the offspring of female horses and male donkeys.
Mules (a cross-breed between a male donkey and a female horse) are usually bred (humans assist them in mating) with other mules. If left with other horses or donkeys, mules are also known to mate with stallions (both male horses and donkeys; male donkeys are commonly called "jacks") and mares (both female horses and donkeys; female donkeys are commonly called "jennies").
Donkeys have nine (9) nipples. Not sure about the horse.
indeed male giraffes have 17 nipples and female have 20
That is not the answer. The answer is Testes.
Your testes control male characteristics. Testes are not glands. They are organs.
This is a male hormone. It is secreted by the pair of testes.
In the male testes
Its male hormones are no longer being produced by its testes so it looses its male characteristics. The same happens to all mammals, cattle, pigs, dogs and humans.
It is the testes!testes
A testes is a male gonad of the reproductive system.
You should, to ensure that the male (if he is intact) will not try to mate with the Jenny. Some donkeys and horses are aggressive to the females while mating.
Cat nipplesYes they do. As a matter of fact, most male mammals have nipples. Male cats, like female cats, have 6 nipples in total.
A steer. Steers are castrated bulls, not cows. Cows do not have testes either, and, there is no such thing as a "male cow".