不同蛋白质水平日粮对不同性别西农萨能羊羔羊生长发育的影响

Effects of Different Protein Levels Dietary on Growth and Development of Male and Female Xinong Saanen Dairy Goat

试验旨在研究不同性别和蛋白质水平对1～100日龄西农萨能羊羔羊生长发育的影响。选取同质性较好的新生公、母羔羊各80只,分别随机分到4个组中,每组40只羊,其中试验1、2组为母羊,试验3、4组为公羊,试验1、3组饲喂低蛋白质水平(17%)的颗粒料,试验2、4组饲喂高蛋白质水平(21%)的颗粒料。定期测量羔羊的体重和体尺指标并统计腹泻率,在试验结束当天采集血液进行生化指标分析,以确定适合西农萨能羊羔羊生长发育的颗粒饲料蛋白质水平。结果表明,在试验前中期,蛋白质水平对羔羊生长发育影响不显著(P>0.05),在此阶段可饲喂低蛋白质水平颗粒料以降低饲喂成本;而在试验中后期,高蛋白质水平可显著促进羔羊生长发育(P<0.05),在此阶段可饲喂高蛋白质水平颗粒料以保证羔羊良好的生长状况;体尺指标受日粮蛋白质水平影响较小,而高蛋白质水平日粮易引发羔羊腹泻,且在试验期内公羔羊较母羔羊表现出更快的生长发育趋势。因此,在羔羊培育中应控制高蛋白质水平饲料的饲喂量。

The present study was conducted to investigate the effects of gender and dietary protein level on the growth and development of Xinong Saanen dairy goat during 1 to 100 day age. 80 male and 80 female lambs with good similarity were se- lected and equally divided into 4 groups and 40 lambs per group. The groups 1 and 2 were females,groups 3 and 4 were males. The groups 1 and 3 were fed granulated feed with 17M protein level,the others were fed with 21~ protein level. In order to choose a feed formula that was suitable protein level for lambs growth and development, body size and weight of lambs were measured regularly and diarrhea rate was also counted. At the end day of the experiment,blood samplings were carried out and biochemical indexes were analysed. The results showed that the different level of protein had no significant effects on the growth and development of goatsduring early to medium term （P^0.05）. Granulated fed with lower protein level should be fed to reduce feeding costs from early to medium term,and feed with higher protein level was better fed during middle and later periods to ensure the rapid growth and development of the lambs（P^0.05）. Body size indexes were less affected by dietary protein level,and high protein level diet was easier to trigger diarrhea, male lambs seemed to have a faster tendence than female lambs in growth and development during the trial period. So, the feeding amount of high protein level should be controlled dur- ing lamb cultivation.