Top:
My way to breed them is, feed the ko's with their stalk and vegetable leaves, especially the stalk: it's kos' natural food. In wild habitat only the ko's immediately after born can have the stalk. However, nowadays one can purchase stalks solely grown for feeding purposes from pet shops. Therefore, make sure to let the ko's to have these food.
Middle:
When the ko' grow up til one can hold it in the palm, other (normal) food can be fed instead.
Bottom:
This is such a happy family...