母猪配种前后气候因子与窝产仔数的关系

本文分析了某猪场１９９３年３月至１９９４年３月之间１７２２胎窝产仔数，夏季（１９９３年６月至９月份）配种所产仔猪数显著低于其它月份（Ｐ〈０．０５）。母猪配种时期气候因素如平均日照，温度，相对湿度和风速与窝产仔猪数的相关系分别为－０．５１６，－０．７７５，－０．２８１，－０．７５１，用通径分析法对以上相关系及各气候因子间的相关系进行部分，求出以上各气候因子以窝产仔猪数的通径系数分别为０．５０７，－０

Relationship between climatic factors around mating and sows litter size

Total of 1722 litters of sows mated between March 1993 and March 1994 were analysed. The average littersize of sows mated in summer months(June 10 September,1993)was significantly(p<0.05)lower than in othermonths.Mothly averages of daily average sun shine Period,temperature,relative humidity and wind speed correlatedstrongly with litter size of sows mated in respective months,with the correlation coefficients of -O. 516,-0.775,-0.281and-0.751.The correlation coefficients between the climatic factors and between clamitic factors and litter size weresubjected to path analysis;The path coefficients of climatic factors to litter size were 0.507,-0.871 ,0515 and O. 512for sun shine period,temperature, relative humidity and wind speed respectively.The determining coefficient of sunshine period,temperature,relative humidity and wind speed to litter size were 0.257,0.759,0.265 and 0.262.There-fore temperature around mating exerted the strongest influence over the subsequent litter size.