晋南牛体重估测公式的研究

Studies on Body Weight Estimation Formulae of Jinnan Cattle

为准确、方便、快速地度量晋南牛的体重 ,运用二元回归原理 ,采用只测量体长 (cm)、胸围 (cm)来估测体重。共测量、验证了 6 90头成年晋南公母牛 ,通过一、二、三类不同膘情的测量、称重、验证 ,总结出一类膘情体重 (kg) =(1.91×体长 (cm) +3.4 7胸围 (cm) - 517.6 )× 1.1;三类膘情体重 (kg) =(1.91×体长 (cm) +3.4 7×胸围 (cm) - 517.6 )× 0 .9,即 :晋南牛体重估测公式为体重(kg) =2×体长 (cm) +3.5×胸围 (cm) - 537,校正系数一类膘为 1.1,三类膘为 0 .9。

The body length (BL) and heart girth (HG) were measured using the duality regression analysis to make an accurate,easy and quick estimation of body weight (BW) After measuring 690 adult male and female Jinnan cattle which were classified as grade 1, 2, and 3 according to fattening condition, the body weight estimation formula were summarized for grade 1 and 3, BW of grade 1 cattle= (1 91*BL + 3 47*HG - 517 6)*1 1; BW of grade 3 cattle = (1 91*BL + 3 47*HG - 517 6)*0 9; the general BW estimation formulae of Jinnan cattle could be written as following, estimated BW = 2*BL + 3 5*HG - 537, the correction coefficients of grade 1 and 3 were 1 1 and 0 9 respectively