At about 10 months old.
A Holstein bull calf can be around 12 months of age to be able to breed.
The Bull Dog Breed was created in 1930-02.
That breed is alive and breeding. The only bull breed extincted is the Cuban pit bull.
A cork-screw bull is a bull with a cork-screw penis. A bull with this defect cannot breed females because the penis is not straight enough to be able to enter a cow's or heifer's vagina to breed her. The penis is, in a way, bent, but it is more shaped like a cork-screw than anything.
It is a breed of dog.
The bull's name in the movie "The Rare Breed" was Vindicator.
A 20 month-old bull should be able to breed around 10 to 30 cows in a breeding season. The most may be 40, but that could be pushing it.
No, the American Pit Bull Terrier is a pedigree breed of dog.
A mutt
There is no such breed.
Staff is short for Staffordshire Pit Bull Terrier or just Pit Bull and is a dog breed.
Breed a cow with a bull and hope you get a bull calf.