So long that it is impossible for a bull to "have babies." Bulls are responsible for breeding cows, not having calves themselves. It's just like asking if a man can have a baby.
3 to 4 months
a bull
Rainbow sharks do have babies.
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about one year
12 months
two weeks
Gerbils usually have babies every 5-6 weeks
3
330 to 350 days
about one month after she getspregnant
28-35 days