title: Aspects of reproduction in New Zealand dairy herds. 1. Gestation length.
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D003612:Dairying; D005260:Female; D008297:Male; D011247:Pregnancy; D011270:Pregnancy, Animal; D013045:Species Specificity; D013997:Time Factors