are dairy cows milked year round?
HOW COWS MAKE MILK. Before a cow can start producing milk, she must have delivered a calf. Cows usually produce one calf each year. A cow starts to produce milk when her first calf is born, which typically happens when the cow is about two years old.Pregnancy lasts nine months and the cow is usually able to fall pregnant again about 100 days after her calf is born.This annual cycle ensures that calves are born at the best time of year. She continues to produce milk for the first seven months of pregnancy. cow starts to produce milk when her first calf is born, which typically happens when the cow is about two years old. Pregnancy lasts nine months and the cow is usually able to fall pregnant again about 100 days after her calf is born.