猪窝产活仔数与初生窝重、21日龄窝重的相关分析

测定84头新关系杜洛克母猪的窝产活仔数、分娩胎次、初生窝重、21日龄窝重，分别按照窝产活仔数分组进行方差分析和性状间的相关回归分析，探讨分娩胎次对猪繁殖性状的影响。结果表明：窝产活仔数、初生窝重、21日龄窝重组间差异均呈极显著（P〈0．01），初生窝重在窝产活仔猪数为9头和10头，7、8、9头差异不显著，其余各组之间差异显著或极显著。21日龄窝重在窝产活仔数为7、8、9、10、13头之间差异均不显著。对窝产活仔数与分娩胎次、初生窝重、21日龄窝重进行相关分析，分娩胎次与21日龄窝重指标不相关，其余各组指标均达到极显著（P〈0．01）水平。综合分析表明猪窝产活仔数在10～12头可取得最佳经济效益．

Correlation Analysis between Litter Size and Primary Litter Weight, 21-Day Litter Weight in Duroc Pigs

The indexes such as litter size, parity, litter weight at birth, 21-day litter weight of 84 Du- roc sows of new American variety were measured. The correlation and regression analysis of performances and analysis of variance were conducted according to litter size to explore the effect of parity on reproductive performance. The results showed that the difference of litter size , litter weight at birth as well as 21- day litter weight among groups was extremely significant（P〈0.01）, and the difference of litter weight at birth when the number of live piglet was 7, 8 and 9 was insignificant, while other groups＂ were significantly different or extremely different. The differences of 21d litter weight when the number of live piglet was 7,8,9,10,13 were all insignificant. The correlation analysis was carried out on litter size, parity, litter weight at birth and 21d litter weight. It was shown that there was no correlation between parity and 21d litter weight indexes, while other groups indexes all reached the extreme level（P〈0.01）. The compre-hensive analysis revealed that the optimized economic let ranged from 10 to 12. benefits can be achieved when the number of live pig let ranged from 10 to 12.