title: Temporal patterns of growth hormone in blood and seminal plasma of mature dairy bulls.
abstract: This study was conducted to determine if growth hormone (GH) concentration in bovine seminal plasma would be proportional to but less variable than blood plasma GH. The relationship between GH in blood and seminal plasma was also examined critically. Blood samples were collected at 15-min intervals for 5.75 h, while semen was collected at 30-min intervals over the same time period. Average seminal plasma GH concentrations were 3.2 times higher (P less than .05) than blood plasma GH concentrations (40.4 +/- 15.8 ng/ml vs 12.6 +/- 1.2 ng/ml, respectively). The within animal correlation between blood and seminal plasma was consistently low and nonsignificant (P greater than .05). Overall blood plasma GH and seminal plasma GH concentrations were weakly correlated (r = .418; P greater than .05) among bulls. A predictable relationship between blood and seminal plasma GH concentration does not exist under the conditions of this study.
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D002417:Cattle / Q000378:metabolism*; D013006:Growth Hormone / Q000097:blood / Q000378:metabolism*; D008297:Male; D012661:Semen / Q000378:metabolism; D013997:Time Factors
chemical_list: D013006:Growth Hormone