Just one.
it is pregnant 23 months
mares (women zebras) can give birth to one foal (baby zebra) every 12 months . they can have as many as they want. http://en.wikipedia.org/wiki/Zebra
They lay eggs, rather than have live young
Ostriches don't give live birth. They're birds, they lay eggs.
Boas generally have between 30 and 40 living young but can have as many as 60.
Yes, ferrets give birth to live young known as kits. A ferret litter can be as few as 1 kit or as many as 17 kits.
A yak is a mammal, so they give birth to live young. After a gestation period of about 9 months, they give birth to a single calf.
No. Many nonvenomous snakes, such as boas, give birth to live young. Conversely, a number of venomous snakes lay eggs.
None. Boas give birth to live young. The number of young depend on the species.
Red Pandas usually give birth from 1-4 live young.
Small mammals will often give birth to over 50 babies annually. Larger mammals have a much lower birth rate of 1 or 2 per year.
I'm no expert, but due to the size of a baby zebra I would estimate 1-2 (three at most)