青贮甜高粱替代青贮玉米对羔羊生产性能和养分消化代谢的影响

Effect of forage sweet sorghum silage instead of silage corn on nutrient digestibility,body weight gain of lambs

为了研究饲用甜高粱[Sorghum bicolor(L.)Moench]青贮替代玉米青贮对羔羊生产性能及养分消化代谢的影响,选取3月龄(28.10±0.32 kg)健康断奶羔羊30只,随机分为3组(Ⅰ为玉米青贮组、Ⅱ为甜高粱玉米青贮组、Ⅲ为甜高粱青贮组),每组10只,隔栏单独进行饲养和消化代谢试验。结果表明,饲用甜高粱青贮替代玉米青贮对羔羊的生产性能无显著影响(P>0.05)。Ⅱ组羔羊对磷的表观消化率极显著高于Ⅲ组(P<0.01),而Ⅰ组羔羊对磷的表观消化率与Ⅱ组差异不显著(P>0.05)。羔羊对玉米青贮和50%甜高粱青贮替代50%玉米青贮的其他养分的表观消化率均未产生显著影响(P>0.05),而对其他营养素未产生显著影响。说明饲用甜高粱青贮可以作为肉羊的优质饲料,50%的饲用甜高粱秸秆和青贮分别替代玉米青贮,可提高N的存留率和羔羊对CP消化率。

In order to study the effect of forage sweet sorghum silage instead of silage corn on lamb performance and nutrient digestion and metabolism.Thirty 3-month-old(28.10±0.32 kg)healthy weaned lambs were randomly divided into three groups(Ⅰ was corn si⁃lage group,Ⅱ was sweet sorghum corn silage group,Ⅲ was sweet sorghum silage group),each group had 10 lambs,and were fed and digested separately.The results showed that there was no significant effect on the performance of lambs(P>0.05).The apparent digest⁃ibility of groupⅡwas significantly higher than that of groupⅢ(P<0.01),while the different between that of groupⅠand groupⅡwas not significant(P>0.05).Lamb had no significant effect on the apparent digestibility of other nutrients in corn silage and 50%sweet sorghum silage instead of 50%corn silage(P>0.05),but had no significant effect on other nutrients.The results showed that sweet sorghum silage can be used as high quality feed for meat sheep,and 50%of sweet sorghum straw and silage can replace corn si⁃lage respectively,which can improve the N retention rate and CP digestibility of lamb.