A Study of the Gestation Period of Holstein-Friesian Cows

Investigators have made occasional studies of the duration of gestation of cattle for over a century. Most of these studies have been made with a relatively small number of animals and because of the extreme variation found by some of the earlier investigators, it seems quite probable that some of the records to which they had access may not have been as accurate as could be desired. Those who have studied this subject more recently have, in general, found less variation and have arrived at conclusions that are more uniform.