影响湖北白猪Ⅵ系六月龄体重有关性状的多元统计分析

Multi-factor Analysis of Relative Traits Affecting the Weight of Six-month-age Hubei White Pig (Line VI)

通过对湖北白猪Ⅵ系3世代226头后备猪6月龄8个表型性状的通径分析、决定系数分析以及逐步多元回归分析,结果表明:影响湖北白猪Ⅵ系6月龄体重的主要性状依次为胸围(P＜0.01),体长(P＜0.01)、腹围(P＜0.01)、臀宽(P＜0.01)、体高(P＜0.01),而臀长(P＞0.05)、半臀围(P＞0.05)对体重影响不大.6月龄体重与其它各性状都为中等以上的正相关(P＜0.01),但各性状对6月龄体重的直接影响都不大,表现为综合性状影响,因此.对湖北白猪生长速度的选育在对本性状直接选择的同时,可以结合综合性状进行选择.影响6月龄体重的回归方程为:Y=-136.65037+0.4507X_1+0.5122X_2+0.7176X_3+0.3339X_4+1.1786X_5(P＜0.01,R^2＝0.7467).

The path analysis and gradual multi -factor regression analysis were done for eight traits of 226 six-month-age finishing pigs (generation three) of Hubei white pig (line VI). The results indicated that the major traits affecting the weight of six-month-age Hubei white pig (line VI) were bust(p<0. 01), body length(p<0. 01), belly circumference (p< 0. 01), buttocks width (p<0. 01), body height(p<0. 01). Buttocks length and half buttocks circumference nearly did not affecf the weight (p>0. 05). The positive relation were extreme-ly significant (p<0. 01) between six-month-age weight and other traits, however, each trait had little direct effect on six-month-age weight, the effects were comprehenssive. Therefore, the comprehenssive selection should be adopted in the breeding of growth velocity of Hubei white pig. The regression formule of six-month-age weight to its relative traits was: Y = -136. 65037+ 0. 4057X1 + 0. 5122X2+0. 7176X3 + 0. 3339x4+1. 1786X5 (p<0. 01 ,R2 = 0. 7467)