Variation of the Prepartal and postpartal Body Weight in the Dairy Cow

Variation of the prepartal and postpartal body weight in the dairy cows was investigated for three years from April 1968. The experimental results were summarized as follows: 1) Twenty-nine heads of the dairy cows were used for the expriment, of which the primiparous cows were 6 heada, the second calving cows were 7 heabs, the third and the fourth calving cows were 6 heads, respectively, and the fifth calving cows were 4 heads. 2) The body weight were measured every month from the mating, at the time of taking in tho lying-in room, at the first pospartum week, and every month to the minth postpartum month. 3) After mating, body weight generelly increases gradually until the fifth month of gestation