title: A possible influence of the bull on the incidence of embryonic mortality in cattle.
abstract: Milk progesterone profiles were used to study the high incidence of embryonic mortality between 30 to 80 days after insemination in 91 cows in a single herd. The progesterone levels dropped to basal values at 46.7 +/- 1.37 days after service in 22 per cent of apparently pregnant cows. Embryo loss occurred significantly more frequently following services by one bull (Z). The mortality rates were 14/32 (44 per cent) in cows conceiving to Z compared with 8/73 (11 per cent) in cows conceiving to other bulls. There was no significant effect of the age of the cow or yield on the incidence of embryonic mortality.
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology / Q000235:genetics*; D020964:Embryo Loss / Q000453:epidemiology / Q000235:genetics / Q000662:veterinary; D005260:Female; D005313:Fetal Death / Q000235:genetics / Q000662:veterinary*; D008297:Male; D008892:Milk / Q000032:analysis; D011247:Pregnancy; D011374:Progesterone / Q000032:analysis; D012737:Sex Factors
chemical_list: D011374:Progesterone