日粮蛋白质水平对杜寒杂交断奶羔羊营养物质消化及瘤胃发酵的影响  

Effects of Crude Protein Levels of Rations on Nutrients Digestion and Rumen Fermentation in Dorper× Thin-Tailed Han Crossbred Weaning Lambs

作　　者：司丙文[1] 王俊 张乃锋[1] 姜成钢[1] 楼灿[1] 陈丹丹[1] 斯琴 刁其玉[1] 屠焰[1] 

机构地区：[1]中国农业科学院饲料研究所,北京100081 [2]北京市畜牧总站,北京100029 [3]内蒙古锡盟农牧业科学研究所,内蒙古锡林浩特026000

出　　处：《家畜生态学报》2014年第12期33-38,共6页Journal of Domestic Animal Ecology

基　　金：国家科技支撑计划(2012BAD39B05-3)

摘　　要：试验旨在通过饲喂不同粗蛋白质水平的日粮,研究其对羔羊瘤胃发酵参数及营养物质表观消化率的影响,从而得出一个合适的日粮蛋白质水平。试验选用120日龄的杜泊(♂)×小尾寒羊(♀)杂交一代羔羊18只,随机分成3个处理,公母各半,饲喂代谢能为10.5MJ/kg、粗蛋白水平分别为10.4%、13.0%、15.7%的全混合日粮(A、B、C组),试验期60d。结果表明,随着日粮粗蛋白水平增加,各组羔羊干物质采食量及日增重没有显著差异(P>0.05),各组营养成分表观消化率均有升高趋势;瘤胃pH及氨态氮浓度随蛋白质水平升高而显著升高(P<0.05);A组羔羊瘤胃总挥发性脂肪酸浓度显著高于B、C组(P<0.05),B、C组间差异不显著(P>0.05),随日粮蛋白质水平的提高,乙酸/丙酸比没有显著差异(P>0.05)。日粮蛋白质水平对日粮营养成分的表观消化率、瘤胃总挥发性脂肪酸含量产生影响,但乙酸/丙酸比没有差异,没有改变瘤胃的发酵类型;对于断奶羔羊日粮蛋白质水平13.0%为宜。（Objective）The effects of crude protein levels of rations on nutrient digestion and rumen fermentation in Dorper×thin-tailed Han crossbred weaning lambs were investigated to identify the optimum crude protein level of rations for lambs aged 120-180 days.（Method）Eighteen Dorper× thin-tailed Han F1 lambs were randomly divided into three groups.Each group had 6lambs,half rams and half ewes.Three groups of lambs were fed with three kinds of pelleted rations,respectively（groups A,B and C）.They contain similar metabolizable energy（10.5 MJ/kg）,but the crude protein levels are different（10.4%,13.0%,and 15.7%）.The experiment was conducted in a period of 60 days.（Result）As crude protein level increased,there was no significant difference between dry matter intake and average daily gain in each group（P〈0.05）,apparent digestibility of nutrients of three groups has a tendency to rise;rumen pH and ammonia nitrogen concentration significantly increased along with increase of protein level（P〈0.05）;the concentration of total volatile fatty acids in group A was significantly higher than in the other groups（P〈0.05）and group B and C had no significant difference（P〉0.05）.Acetate-propionate ratio had no significant difference with crude protein level increased（P〉0.05）.（Conclusion）Protein levels of rations affected nutrients apparent digestion and concentration of total volatile fatty acids,but acetate-propionate ratio had no significant difference,rumen fermentation type had not changed,13.0% protein level of ration is advisable for weaning lamb.

关 键 词：羔羊 蛋白质 消化率 瘤胃发酵 

分 类 号：S811.6[农业科学—畜牧学]