Anytime.
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A cow can deliver one calf at a time.
If it is a group of calves born from different mothers than you call them a herd of calves or a group of calves. If it is two calves born at the same time from the same mother than they are twins, just the same as human offspring would be called.
two calves were born yesterday.
No. Blue eyes in calves is a very rare genetic occurrence. Almost all calves born into this world are born with brown eyes, not blue.
Always one. I've never heard of two calves being born at the same time; if there were twins, it's always one after the other, as the cow's pelvis is only wide enough to allow one calf through at a time.
Yes.
goats are born in the spring that's what I think okay
This question is impossible to answer since we have no idea of location where these calves are born, location as in country or state/province.
Yes, most newborn calves have a few teeth already sprouted by the time they are born.
Studies have shown that calves born in summer are lighter than calves born in winter.
April to May.