Optimal inkalvningsålder för rekryteringskvigor till mjölkproduktion
relaterat till data ifrån egen besättning
Heifer’s growth may be divided into three main phases: calf period, puberty and pregnancy. When the heifers are about three months old a critical period begins. This period ends when the heifer reach puberty and have her first oestrus at around 9-12 months of age. In the …