摘要
利用撒坝猪专门化母系 7个世代共 576头母猪的繁殖性能数据 ,对总产仔数 (x1 )、活产仔数 (x2 )、初生窝重 (x3)、 2 0日龄窝重 (x4 )、断奶窝重 (x5)、育成率 (x6 )和断奶仔数 (y) 7个繁殖性状进行了相关和通径分析 ,并在此基础上建立了估计断奶仔数的最优回归方程。结果表明 ,撒坝猪专门化母系的繁殖性能在经过 7个世代的选育后 ,获得了明显提高。各繁殖性状间在表型值上都存在不同程度的相关 ,其中以总产仔数与活产仔数的相关程度最高 (r=0 92 0 1 ) ,其次为 2 0日龄窝重与断奶仔数 (r=0 82 88) ,而初生窝重与育成率间的相关系数最低 (r=0 0 381 )。在所分析的 7个性状中 ,除了总产仔数和活产仔数与育成率间为负相关外 ,其余性状间均为正相关。所建立的估计断奶仔数的多元回归方程为 :y=- 6 1 1 90 +0 6986x2 +0 0 33 7x4 +0 0 0 4 8x5+0 0 71 8x6 。
The data of 576 Saba specific dam line female pigs were used to carry correlation and path analysis among 7 reproductive traits,total number of pigs born(TNB,x_1),number born alive(NBA,x_2),litter weight at birth(x_3),litter weight at 20 days(x_4),weaning weight of litter(x_5),weaning percentage(x_6)and number weaned(y).The optimized regression equation for estimating mumber weaned was established by stepwise regression.The results showed that the reproductive traits of Sabe specific dam line were improved effectively after 7 generations of selection.Different degree correlations existed between these traits,of which the correlation coefficient between TNB and NBA was reached to 0.920 1,Which is the highest,the secong was that between litter weight at 20 days and number weaned(r=0.828 8),and the smallest was that between litter weight at birth and weaning percentage(r=0.038 1).All the correlations were positive except those between TNB or NBA and weaning percentage.The optimized equation for estimating number weaned was y=-6.119 0+0.698 6x_2+0.033 7x_4+0.004 8x_5+0.071 8x_6.
出处
《畜牧与兽医》
北大核心
2003年第11期1-3,共3页
Animal Husbandry & Veterinary Medicine
基金
云南省"十五"科技攻关项目 (2 0 0 1NG39)。
关键词
撒坝猪
专门化母系
繁殖性状
相关分析
通径分析
Saba specific dam line pig
reproductive trait
correlation analysis
path analysis
