Primarily it's always once a year.
Most likely once a year.
Not very often. It is more common for a cow to have twins than triplets: triplets occur maybe 1:100,000 births. A cow will have twins 1:1000 births.
reproduction
Sexual reproduction
Vegetative reproduction through suckers.
Via sexual reproduction: The bull mates with the cow.
cones
by living with your mom
Reduction division
Yes. They are constantly replenished through the process of sexual reproduction.
cutting
528.2