摘要
浙江中白母猪繁殖成绩与地面温湿气象资料相结合进行统计分析的结果表明,母猪在60天哺乳期饲养制度下,产后发情并配种受孕平均需66.57天。其中离仔后配种占75.41％,就这部分母猪而言,离仔次旬平均日最高气温超过30℃或RH78％以上或THI值大于75,离猪后7天内的受孕率显著降低;配种时和配种后20天内受高温剌激,胎几发育数减少,平均气温25℃以上时的窝仔数(11.73头、11.83头)较20—25℃条件下少0.68头和0.37头;产前当旬处于高温的,产仔成活率较高;20日龄仔猪存活率以出生后次旬环境温度在20℃以上或THI值大于65时为高,而35—45日龄时的环境温湿度对20—60日龄仔猪存活率影响不明显。
The relationship of the reproductive performnance of zhejiang white swine with the environmental temperature and humidity had been statistically analysed. The results showed that the sows needed average 66.57 days to be pregnant under the condition of the sucking period for 60 days, in which the sows mated after weaning reached 75.41 per cent. when the maximan temperature was higher than 30℃ or the relative hamidity over 78 percent or the temperature-humidity index (THI)more than 75 within 10 days after weaning the conception rate within a week after weaning dropped remarkably. when the sows were suffered from higher temperature within 20 days after mating the member of embryo per sow and litter size reduced The Survival rate of piglets on 20 day old was the highest when the temperature was over 20℃ or THI more than 65 during 10 days after birth. The environmental temperature and humidity during the later period of sucking did not significantly effect the survival rate piglets.
出处
《家畜生态》
1993年第1期26-31,共6页
Ecology of Domestic Animal
关键词
温度
母猪
繁殖
湿度
Temperature
Sow
Reproductive performance
