Because most bulls don't reach sexual maturity until they are 10 to 12 months old.
Never breed a puppy,if it is a girl wait until the 2nd or even the 3rd heat if it`s a boy wait until he`s a least 1 year old.
if your budgie keeps leaving her chicks its probably because she is to young to breed. most breeders wait until their budgie is about one year old before they breed them. it is best to wait until your budgie is 18 months before breeding them
A cat is usually able to breed at 6 months, but it is good to wait until it is 1 year old to reduce risks. Color doesn't matter for when it is ready to breed.
Breeders wait until the female is part the first heat but waiting 3 years of age is recomended.
As with all dog breeds, it is best to wait until the dog is full grown. At least one year of age.
A Staffordshire Bull Terrier wins Best of Breed every year. Best of Breed is the Best dog from each breed, so there will always be one from the Staffy breed. This year (2011) a red Staffordshire Bull Terrier came third in Best in Group but a Staffy has never won Best in Show.
All puppies are still considered "puppies" until they are about 1 year old. But if you want to know something specific about your dog/breed ask your vet
It's better to wait until their second season normally. Usually 18-24 months is the given.
At least a year. Wait until the 2nd heat cycle to breed them to decrease risk of death of health problems.
No I have a really old dog who just did.
For any dog, you should wait at least for its second heat. Although most high quality dog breeders will wait until until the dog is in its second year so that the dogs general health can be properly evaluated to ensure you are breeding to improve the breed
You don't breed hamster babies until there at least 1 year old