营养条件对荷斯坦公犊生长发育及血液中激素水平的影响

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选择同期出生的48头中国荷斯坦公犊,在其1月龄时随机分为4组,Ⅰ、Ⅱ、Ⅲ、Ⅳ组分别采用全乳、全乳+精料、代乳粉(料)和精料(对照组)进行饲养,研究不同日粮饲喂犊牛对其生长发育的影响。结果表明:I组的体重在2~6月龄时均显著高于Ⅲ、Ⅳ组(P〈0,05);尽管Ⅲ组的体重和日增重在2月龄时显著低于另3组(P〈0.05),但到6月龄时,其日增重达到1.35kg/d,且与Ⅰ组无显著差异(P〉0.05)并明显高于Ⅳ组(P〈0.05)。说明代乳料饲喂的犊牛在后期的生长能够接近全乳饲喂的水平。4组间体长指数和髋胸指数在分
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