温湿度与母猪受胎率关系的研究

Correlation between temperature,humidity and conception rate in sow

通过对中山市某大型猪场 449头母猪第一情期受胎率的统计及其与温湿度等主要气候生态因子的相关分析表明 ,气温对母猪第一情期受胎率的影响较大 ,它们之间呈极显著的负相关关系。其中月均气温、平均最高气温、平均最低气温及高于 30℃天数与母猪第一情期受胎率的相关系数分别为 - 0 8875 ,- 0 850 7、 - 0 90 84和 - 0 90 5 9,而气湿与情期受胎率的相关系数只有 - 0 2 65 7,经检验相关关系不显著 (P >0 0 5)。高温高湿的气候 ,最易使母猪第一情期受胎率下降。改善养猪的环境 ,夏季要注意防暑或调整日粮或配种时间 。

By analysing the first estrus conception rate in 449 sows from a pig farm in Zhongshan city, the correlation between conception rate and air temperature and so on was determined. The results showed that the first estrus rate was greatly affected by the air temperature. Air temperature was negatively correlated with conception rate with correlation coefficient -0 887 5,-0 850 7,-0 908 4 and -0 905 9, respectively between the first estrus pregnancy rate and the month avereage temperature, avereage maximum temperature, avereage minimum temperature and the days above 30℃ in a month. Humidity influence was feeble(correlation coefficient -0 265 7).The estrus conception rate was reduced in the climate of high temperature and humidity. It is suggested that more attention should be paid to preventing heat stress, adujsting the diet or breeding time in order to raise the pig conception rate in summer.