补饲日粮不同精粗比对妊娠后期藏母羊生产性能及血清指标的影响

Effects of different concentrate to roughage ratios of supplementary feeding diet on production performance and serum biochemical parameters of Tibetan ewes at late stages of pregnancy

试验旨在研究补饲日粮不同精粗比添加量对妊娠后期藏母羊生产性能及血清生化指标的影响,以确定母羊补饲日粮适宜精粗比。试验采用单因素完全随机区组设计,将900只体况良好,体重、胎次和配种时间接近的妊娠后期105 d藏母羊,随机分为3个处理,每个处理300只羊。分别饲喂3种不同精粗比(精料补充料麦青干草=46,55,64)的妊娠后期藏母羊补饲日粮,试验期45 d。结果表明:1随着精粗比例的提高,母羊分娩后失重越小,母羊的产羔率和羔羊的初生重也随之提高,羔羊的初生重Ⅱ组和Ⅲ组差异不显著(P>0.05),但都极显著高于Ⅰ组(P<0.01),饲喂精粗比为55和64的补饲日粮,母羊的生产性能较好;2随着精粗比例的提高,三组血清中总蛋白(TP)、白蛋白(ALB)、甘油三酯(TG)、总胆固醇(CHO)的含量差异不显著,Ⅱ组含量最高,只有血糖(GLU)含量随之升高,但Ⅱ组和Ⅲ组差异不显著(P>0.05),饲喂精粗比为55补饲日粮,母羊的血清营养物质含量较高;3饲喂精粗比为55补饲日粮,经济效益最好。在本试验条件下,妊娠后期母羊补饲日粮的适宜精粗比(精料补充料和燕麦青干草日补饲量分别为75 g/只,DE和NDF水平分别为1.37 MJ和50.42 g)为55,45 d补饲成本为15.86元/只。

This experiment was conducted to investigate the effects of different concentrate to roughageratios of supplementary feeding diet（SFD） on production performance and serum parameters of Tibetanewes at late stages of pregnancy and to determine supplementary dietary optimal concentrate to rough-age ratio of Tibetan ewes. Nine hundred healthy Tibetan ewes on 105 th late pregnancy with similarbody weight, parity, and mating time were randomly assigned to three treatments with three hundredsheep in each treatment by a single factor completely randomized block design. Ewes in different treat-ments were fed SFDs with three concentrate to roughage ratios, which were 46, 55 and 64 re-spectively. The test lasted for 45 days. The results showed as follows： 1 The ewe lambing rate andthe birth weight of the lamb were increased withthe increasing of concentrate to roughage ratio,to the contrary, ewe weight loss after childbirthdecreasing. Lamb birth weight in Ⅱ and Ⅲgroup has no significant difference（P〉0.05）, sig-nificantly higher than that of group Ⅰ（P〈0.01）.The production performance of ewes Fed dietswith concentrate to roughage ratios of 55 and6 4 is better than that of the other group. 2With the improvement of concentrate to roughage ratio, serum total protein（TP）, albumin（ALB）, tri-glycerides（TG） and total cholesterol（CHO） have no significant difference between groups, the content ofⅡ group being the highest level. Otherwise the content of blood glucose（GLU） in Ⅱ and Ⅲ grouphave no significant difference（P〉0.05）, increasing with the advancement of concentrate to roughage ra-tio. The serum nutrient level of ewes Fed diets with concentrate to roughage ratios of 55 is betterthan that of other two groups. 3 The economic benefits is best in 55 group. Under the experimentalcondition, Tibetan ewes have higher production performance of SFDs with concentrate to roughage ra-tio of 55. The 45-day cost of SFD is 15.86 Yuan.