江西时时彩三星选好:Effects of arginine supplementation during early gestation (day 1 to 30) on litter size and plasma metabolites in gilts and sows作者：Li J, Xia H, Yao W, Wang TT, Li JT, Piao XS, Thacker, Wu GY and Wang FL*
時間: 2015 來源: 農業部飼料中心
期刊：J Anim Sci.2015.93:5291-5303
摘要：Two experiments were conducted,under typical commercial swine production conditions,to determine effects of dietary arginine supplementation during early gestation on the performance of gilts and sows. In Exp. 1, between d 1 and 30 of gestation, 62 Landrace gilts and 113 sows consumed a corn- and soybean meal–based diet supplemented with 1.3% l-arginine HCl or 2.2% l-alanine. Total numbers of piglets born (P < 0.05) and born alive (P <0.01) per litter and litter birth weights of piglets born(P < 0.05) and born alive (P < 0.05) were increased in the arginine group compared with the control. In Exp. 2, 155 multiparous Landrace sows received 1.3% L-arginine HCl supplementation between d 1 and 14(T2; n = 41), d 15 and 30 (T3; n = 40), or d 1 and 30 (T4; n = 37), whereas the control group received 2.2% l-alanine supplementation between d 1 and 30 (T1; n = 37). Blood samples were randomly obtained from 6 sows per group on d 1, 14, and 28 of gestation to determine plasma concentrations of AA and related metabolites. Total numbers of piglets born (P = 0.084) and born alive (P = 0.080) per litter tended to be higher for sows supplemented with arginine between d 1and 14 of gestation (T2) than for control sows (T1).Concentrations of arginine and nitric oxide metabolites were greater (P < 0.05) in T4 compared with T1 and T3 on d 14 of gestation and were also greater in T4 compared with T1 and T2 on d 28 of gestation. Plasma concentrations of spermidine (P < 0.001) were increased in T3 and T4 compared with T1 and T2 on d 28. These results indicate that dietary arginine supplementation during early gestation improves the reproductive performance of gilts and sows, possibly via nitric oxide and polyamine-dependent mechanisms.