title: Radioimmunoassay for measurement of bovine alpha-lactalbumin in serum, milk and tissue culture media.
abstract: A sensitive, specific radioimmunoassay for bovine alpha-lactalbumin (alpha-la) suitable for measurement of serum, tissue culture media and milk was developed. alpha-La was not detected in serum from prepubertal male or female cattle, but was detected as early as 60 d of gestation in nulliparous Holstein heifers, the level being greatly increased during the last one third of gestation. Serum from cross bred beef heifers contained less alpha-la and it was not detected until late gestation. Concentrations of alpha-la in serum samples from pregnant multiparous Holstein cows decreased at drying-off and subsequently increased just before parturition. Secretion of alpha-la by mammary tissue explants from steroid-primed prepubertal Holstein heifers was induced by the addition of bovine prolactin, ovine prolactin or human growth hormone to tissue culture media.
mesh_terms: D000780:Anestrus; D000818:Animals; D002417:Cattle; D003470:Culture Media / Q000032:analysis; D005260:Female; D007768:Lactalbumin / Q000032:analysis* / Q000097:blood; D007774:Lactation; D008297:Male; D008892:Milk / Q000032:analysis*; D009919:Orchiectomy; D011247:Pregnancy; D011863:Radioimmunoassay
chemical_list: D003470:Culture Media; D007768:Lactalbumin