4～8月龄滩羊日粮能蛋比相同条件下分阶段育肥的效果研究

发布时间：2018-05-03 19:37

  本文选题：滩羊羔羊 + 能蛋水平　； 参考：《中国畜牧杂志》2016年23期

【摘要】：基于滩羊生长发育规律,实施羔羊阶段式育肥。将4月龄112只羊随机分成4个处理组,每组4个重复(公、母各2个重复)。根据羔羊体重目标,分为3个育肥阶段(22~28、29~35、36~40 kg),每个阶段结束时进行屠宰试验以测定育肥性能和肉品质。根据肉羊饲养标准(NY/T816-2004),每个阶段均设置84%(Ⅰ组)、96%(Ⅱ组)、108%(Ⅲ组)和120%标准(Ⅳ组)能量和蛋白水平,且同一阶段等能蛋比相同的日粮。结果表明:3个阶段中,滩羊的末体重、平均日增重、胴体重、屠宰率、优质切块重、GR值和尾重均呈现相同变化规律,即Ⅰ组Ⅱ组Ⅲ组Ⅳ组;22~28 kg,Ⅳ组的末体重和优质切块重显著高于Ⅱ组(P0.05),Ⅳ组的大理石评分值和肌肉中脂肪含量均显著高于Ⅰ组(P0.05),Ⅳ组的嫩度值显著小于Ⅰ、Ⅱ和Ⅲ组(P0.05);29~35 kg,Ⅳ组的末体重比显著高于Ⅱ组(P0.05),Ⅳ组大理石评分值和肌肉中脂肪含量均显著高于Ⅱ组(P0.05);36~40 kg,Ⅲ组的GR值和尾重均显著低于Ⅳ组(P0.05),Ⅲ组的大理石评分值显著高于Ⅱ组(P0.05),与Ⅳ组间无显著差异(P0.05)。由此可见,在体重22~28、29~35、36~40kg阶段,分别饲喂消化能12.30 MJ/kg和粗蛋白15.37%、消化能10.65 MJ/kg和粗蛋白13.61%、消化能9.53 MJ/kg和粗蛋白11.91%的日粮有助于提高育肥性能和获得优质滩羊肉。
[Abstract]:Based on the law of growth and development of Tan sheep, the stage fattening of lambs was carried out. 112 sheep aged 4 months were randomly divided into 4 treatment groups with 4 replicates in each group (male, female, 2 repeats). According to the body weight target, the lamb was divided into three fattening stages, namely, 22, 28, 29, 35, 36, 36, 40 kg / kg, respectively. Slaughter tests were carried out at the end of each stage to determine the fattening performance and meat quality. According to the standard of NYT / 816-2004, 84 (group 鈪，

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