国产LRH—A₃提高河北细毛羊受胎率最佳剂量试验

Study on the Optimal Dose of Chinese LRH-A_3 for Rairing Pregnancy Rate of Hebei Finl Wool Sheep

在河北细毛羊配种季节，根据发情羊只数，随机分成３组，即试验１组：在输精的同时每只羊肌注ＬＲＨ－Ａ３４０μｇ；试验２组注射８０μｇ；对照组只输精不注射．然后比较其情期受胎率，第２年根据上一年的试验结果，在同一时期、同一羊群内，调整ＬＲＨ－Ａ３剂量．即试验３组，每只羊注射５０μｇ．试验回组注射１００μｇ；时照组只输精不注射．其它方法均相同，以筛选ＬＲＨ－Ａ３的最佳剂量，试验结果表明：ＬＲＨ－Ａ３的最佳剂量为５０μｇ，情期受胎率为９３．５％（２９／３１），较对照组７３．５％（２５／３４）提高２００个百分点，差异显著（Ｐ＜０．０５）．有效剂量为４０～８０μｇ，比对照组的情期受胎率提高４．４～２０．０个百分点．结果表明，在配种的同时，给细毛羊注射适宜剂量的ＬＲＨ－Ａ３方法简单适用，提高受胎率效果显著，可作为提高养羊生产经济效益的一项技术措施进行推广．

During tupping season,according to the number of ewes in estrus they were divided into three groups at random,i.e.first test group's ewes were inseminated and at the same time injected LRH-A3 40μg;control group's ewes were not injected,in order to compare their non-return rate.For screening the optimal dose of LRH-A3 dose was corrected,consulting the results of first year cxperiment, in second year with the same flock,i.e. third group's ewes were injected 50μg;fourth groups ewes, 100μg.The conclusion was put forward that 50μg LRH-A3 was the optimal dose,which non-return rate was 93.5% (29/31),higher than that of control(73.5%),the difference was significant(P<0.05)and 40-80μg was effective dose.