摘要
根据甘肃高山细毛羊母羊妊娠后期营养缺乏状况,配制出中等能量中等蛋白质补饲料Ⅰ、低能量高蛋白质补饲料Ⅱ和高能量低蛋白质补饲料Ⅲ3种补饲料。选择健康、体重相近的妊娠后期母羊60只,随机分为A、B、C、D4组,每组15只,每个重复1只羊,A、B、C组为试验组,分别补饲饲料Ⅰ、Ⅱ和Ⅲ;D组为对照组,按牧民传统方式饲养,试验期共68d。试验结果表明,A、B、C补饲组母羊平均日增重分别为102、109和114g/d;A、B、C补饲组羔羊初生重分别为4.09、3.91和4.40kg,均显著高于对照组。补饲料Ⅲ对试验羊血清葡萄糖(glucose)、甘油三酯(triglyceride)和尿素氮(blood urea nitrogen)浓度有显著影响(P<0.05);补饲料Ⅱ对试验羊血清总蛋白(total protein)、谷草转氨酶(aspartate transaminase)浓度有显著影响。补饲组试羊瘤胃液总氮、瘤胃液蛋白氮含量显著高于对照组(P<0.05)且A组显著高于其他各组,B组瘤胃液尿素氮浓度显著高于其他各组(P<0.05)。试验组瘤胃液挥发性脂肪酸(volatile fatty acid)浓度和丙酸摩尔比显著高于对照组(P<0.05);试验组瘤胃液中乙酸/丙酸显著低于对照组(P<0.05)。3种补饲料对试验羊瘤胃液pH和瘤胃液氨态氮影响均不显著(P>0.05)。
The nutrient intake of Gansu Alpine Fine-Wool ewes is often insufficient during late pregnancy.Therefore,three complementary concentrates(type Ⅰ,Ⅱ,and Ⅲ)with different energy and protein levels were designed and tested as supplementary feeds for Gansu Alpine Fine-Wool ewes during late pregnancy.Sixty healthy ewes with similar body weight in late pregnancy were randomly divided into four groups(A,B,C,and D).Each group comprised of 15 ewes with 1ewe per replicate.Groups A,B,and C were fed with supplementary feedⅠ,Ⅱ,andⅢ,respectively,while group D was grazed on pasture according to the local practice.The experiment lasted for 68 days.The average daily weight gain of group A,B,C was 102,109 and 114g,respectively,and the lamb birth weight was 4.09,3.91 and 4.40 kg,respectively.These values were higher than the corresponding values in group D.The serum glucose,triglyceride,and blood urea nitrogen concentration in ewes were significantly affected by supplementary feedⅢ(P0.05).The total protein and aspartate transaminase contents were significantly affected by feed Ⅱ.The total nitrogen and rumen protein nitrogen contents in the rumen liquid of ewes were significantly higher in groups A,B,and C than in group D(P0.05),and were significantly higher in group A than in groups B and C.The highest urea nitrogen content was in group B(P0.05).The concentration and molar ratio of volatile fatty acids were significantly higher in groups A,B,and C than in group D(P0.05),and the acetate/propionate ratio was significantly lower in groups A,B,and C than in group D(P0.05).The rumen fluid pH and ammonia nitrogen concentration did not differ significantly among the four groups(P0.05).
出处
《草业学报》
CSCD
北大核心
2017年第7期106-115,共10页
Acta Prataculturae Sinica
基金
公益性行业(农业)科研专项放牧牛羊营养均衡需要研究与示范(201303062)
牧区极端气候条件下牛羊应急专用饲料研究与示范(201303062-5)资助
关键词
甘肃高山细毛羊
妊娠后期
补饲
生产性能
血清生化指标
瘤胃内环境
Gansu Alpine Fine-wool sheep
late pregnancy
supplementary feeding
production performance
serum biochemical indices
rumen environment