title: Pregnancy diagnosis by milk progesterone on days 18, 22, and 24 postbreeding in dairy cows.
abstract: Milk samples were collected from 91 dairy cows on days 18, 22, and 24 postbreeding. The progesterone values of these samples were assayed, using enzyme-immuno-assay for pregnancy diagnosis. These animals were classified by nonpregnant (low progesterone values, 5 ng/ml or less) and pregnant (high progesterone values, more than 5 ng/ml). The accuracy of diagnosis on days 18, 22, and 24 postbreeding were 56%, 78%, and 79% for pregnant cows and 90%, 93%, and 93% for nonpregnant animals. The sampling date had a significant effect on diagnostic accuracy (P less than 0.05).
authors.affiliation: Cairo University, College of Veterinary Medicine, Department of Surgery and Theriogenology, Giza, Egypt.
authors.forename: A A
authors.initials: AA
authors.lastname: Seida
authors.forename: K N
authors.initials: KN
authors.lastname: Bretzlaff
authors.forename: R G
authors.initials: RG
authors.lastname: Elmore
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D005260:Female; D007124:Immunoenzyme Techniques; D008892:Milk / Q000737:chemistry*; D011247:Pregnancy; D011258:Pregnancy Tests / Q000662:veterinary*; D011374:Progesterone / Q000032:analysis*; D013997:Time Factors
chemical_list: D011374:Progesterone