Effect of porcine somatotropin administration in young pigs during the growth phase from 10 to 25 kilograms.

摘要: We conducted two experiments to determine the efficacy of exogenous porcine somatotropin (pST) on enhancing performance during an early phase growth (10 kg initial BW) when pigs are already growing efficiently and have high rates lean deposition low lipid deposition. In Exp. 1, was measured 45 barrows that received one five daily doses (0, 50, 100, 150 200 microg/kg recombinant pST. 2, 27 were used in a slaughter-balance study which groups either buffer (control) or 120 BW pST third group slaughtered for body composition. both experiments, i.m. injections their respective dose 20 d. The diet fed ad libitum consumption calculated contain 3.5 Mcal DE/kg, 22.3% CP, 1.5% lysine. Administration failed alter overall rate efficiency gain experiment. However, 2 treated with had increased protein water but reduced rates. Furthermore, treatment resulted characteristic reductions plasma urea nitrogen elevations glucose NEFA. Plasma concentrations insulin IGF-I also increased, IGF-II IGF binding protein-2. Overall, data demonstrated very young respond enhanced tissue accretion metabolic changes, response is attenuated compared previous studies older pigs.