title: Estimation of melatonin in bovine plasma: patterns in Jersey heifers treated with cloprostenol at two times of day.
abstract: The estimation of melatonin in bovine plasma by radioimmunoassay is described and some aspects of specificity are discussed. Mean values for individual heifers ranged from 0.025 to 0.25 nmol/l during the day and were significantly (P less than 0.01) raised in each animal to mean values of 0.19 to 1.41 nmol/l at night. The hormonal changes after cloprostenol injections were not affected by the time of day at which the heifers were treated.
mesh_terms: D000818:Animals; D002417:Cattle; D002940:Circadian Rhythm / Q000187:drug effects; D003008:Cloprostenol / Q000494:pharmacology*; D005260:Female; D007986:Luteinizing Hormone / Q000097:blood; D008550:Melatonin / Q000097:blood*; D011374:Progesterone / Q000097:blood; D011461:Prostaglandins F, Synthetic / Q000494:pharmacology*; D011863:Radioimmunoassay
chemical_list: D011461:Prostaglandins F, Synthetic; D003008:Cloprostenol; D011374:Progesterone; D007986:Luteinizing Hormone; D008550:Melatonin