Here's why:
* Teats are for milk production, not calf-raising: The number of teats doesn't affect a cow's ability to give birth or care for her calf. The teats are primarily for milk production, and the calf's ability to thrive depends on the amount of milk available, not the number of teats.
* Motherly instincts: Cows have strong maternal instincts and will care for their calves regardless of their physical traits.
* Calves can nurse from different teats: A calf can nurse from multiple teats, so even if one or more teats aren't functioning properly, the calf can still get enough milk.
It's important to note that having an extra teat can sometimes cause problems, like mastitis (inflammation of the udder), but this doesn't usually affect the cow's ability to raise a calf.