Two times a year, leading to over 20 piglets a year, 8-12 per litter.
2 times in a year
Once.
250
Normally once.
twice
Usually only once.
Small mammals like mice and shrews can give birth many times in a year.
An echidna lays a single egg just once a year.
Cows typically give birth once a year. The gestation period for a cow is around nine months, so they will usually have one calf per year.
Deer breed one time a year and they only give birth one time a year!
They can give birth to as many as 40 pups per year, and those progeny can start having babies about 8 weeks later each producing up to 10 litters per year.
The gray fox has one litter of kits each spring.