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贵州香猪7~25kg生长阶段的氨基酸沉积规律与需要量的研究

DOI: 10.3969/j.issn.1006-267x.2011.11.023

Keywords: 贵州香猪,氨基酸,沉积规律,扣除蛋白质等消化能

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Abstract:

为研究贵州香猪7~25kg生长阶段的氨基酸沉积规律,本试验选取60~75日龄的贵州香猪34头(公母各占1/2),采用扣除蛋白质等消化能(protein-freeequalizeddigestibleenergy,DEpf)饲粮设计,通过比较屠宰试验,旨在建立贵州香猪在此生长阶段的氨基酸需要量模型。结果表明,贵州香猪每千克无脂增重的可消化赖氨酸(DLys)沉积量在7~16kg和16~25kg2个体重生长阶段及相应体重段的蛋白质与氨基酸不同梯度饲粮间基本一致,平均沉积量为15.33g;其他必需氨基酸的沉积量与Lys沉积量间保持稳定的比例关系;摄入DLys扣除与增重相应的维持Lys消耗后,剩余的几乎全部用于体蛋白质沉积,平均沉积率为95.36%。上述结果表明,Lys是贵州香猪的第一限制性氨基酸,每千克自然增重生长的DLys需要量为(13.58-0.075BW)g;以DLys沉积量为100建立的用于生长的可消化必需氨基酸需要量模型为:Lys100、Thr55、Val104、Met23、Ile44、Leu123、Phe15、His44、Arg92和Trp17。

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