回归法测定生长猪内源钙排泄量及钙真消化率的研究*

 采用多重线性回归法测定生长猪内源钙排泄量及菜粕和豆粕钙的真消化率。试验选用5头健康大白×长白阉公猪为试验动物，平均体重为（21.6±1.43）kg。试验采用5×5拉丁方设计，设5个钙水平（0.10%, 0.15%, 0.20%, 0.25%和 0.25%）。日粮以豆粕、葡萄糖、玉米淀粉等为基础，以菜粕为待测植物性饲料，配制半纯合试验日粮，菜粕和豆粕为钙唯一来源。结果表明，生长猪采食豆粕加菜粕日粮的内源钙的排泄量为（0.61±0.18）g/kg DMI，对菜粕钙真消化率为（48.72±24.04）%，对豆粕钙真消化率为（67.80±7.12）%。相对于表观消化率，日粮钙真消化率更稳定（表观消化率为7.85%～48.37%；真消化率为59.63%～66.78%）。豆粕和菜粕钙表观消化率可加性差，而真消化率配制日粮具有很好的可加性。

Endogenous Outputs and True Dotulgestibility of Calcium Associated with Rapeseed Meal and Soybean in Growing Pigs by Multiple Linear Regression Aanalysis Technique

Multiple Regression analysis technique was used to measure the fecal calcium （Ca） endogenous outputs and true Ca digestibility values with rapeseed meal and soybean meal in this study with growing pigs. 5 Yorkshire ×Landrace barrows, with average initial body weight of （21.6±1.43）kg, were allocated to one of five experimental diets, according to a 5×5 Latin square design. The 5 experimental diets were formulated to contain 5 Ca level （0.10%, 0.15%, 0.20%, 0.25% and 0.25%）, with the rapeseed meal and soybean meal as the sole Ca source. The results showed that the Ca endogenous output of growing pigs was （0.61±0.18）g/kg DMI, true Ca digestibility of rapeseed meal was （48.72±24.04）%, and true Ca digestibility of soybean was （67.80±7.12）%. True Ca digestibility rather than apparent digestibility，showed a perfect additivity associated with rapeseed meal and soybean meal when used in diet formulation for swine.