In a cattle herd the female yearlings and two year olds are considered heifers. They will usually not have their first calf until they are two years old. 2nd calvers are then considered "cows". So you are looking at 3 year olds being considered cows.
Raise what to 600
Cow
A jersey cow can easily raise two to four calves on grass, so long as the grass itself is of high nutrient value and she also has access to mineral and water.
It will take an average of about 24-72 hours for a cow to fully digest their feed from mouth to anus.
One day.
50 years
about 0 to 2 days
cow hand that raise live stock
calf and a cow
Yes.
About 5 minutes.
You need to provide more information. However, from what I understand, it takes a lot of work.