GnRH对提高母猪受胎率和产仔存活数作用的研究

Studies on Imroving fertility Rate of Sows and Viability of Piglets byGnRH

在工厂化猪场，繁殖占有重要地位，它是提高猪群数量和质量的前提条件，产仔数的多少，标志着猪场繁殖水平的高低，但由于工厂化猪场存在各方面条件因素，尤其是国外引进猪种（长白、大约克、杜洛克、汉普夏），常出现母猪不孕，产仔数少，存活率低，死胎多等问题。针对这些情况，我们试用促性腺激素释放激素（ＧｎＲＨ）给发情母猪肌肉注射，以期提高受胎率和产仔数。本实验在四平市种猪场随机选出２３头母猪，分为２组，第一组为实验用１３头母猪，分两个剂量注射，７头母猪注射剂量为２ｍＬ（含ＧｎＲＨ１００μｇ），６头母猪注射４ｍＬ（含ＧｎＲＨ２００μｇ）。另一组１０头母猪为对照组，不做任何处理。结果表明：实验组受胎率（９２．３％）明显高于对照组（８０％）。用药母猪产仔存活率也出现增高，实验组平均窝产仔数为１０．３３头，产活仔数为９．４２头，产仔存活率为９１．２％，对照组平均产仔数为８．７５头，产活仔数为７．０头，产仔存活率为８０％。

In factory pig farms,reproduction is importet and prerequisite forimproving number and quality of swine herd.The number of piglets mensthe ability of reproduction.But some factors,esecially the breeds ofswine from abroad (landrace,Yorkshire,Duroc and Hampshire),often resultin infertility,few piglets,low viability rate and high embryonic death.In order to solve the problems,we try injecting intramuscularly GnRHto estrus sows to improve fertility rate and the number of piglets.Thispaper selected at random 23 sows in Si ping pig farms.Thirteen sowswere used as experiment group,seven of which were injected 2 ml(GnRH100 μg) and six were injected 4 ml(200 μg).The other sows were nottreated with GnRH and used as control group.The results showed thefertility rate inexperiment group(92.3%)was apparently higher than theone in control group(80%).In experiment group the averagenumber ofpiglets was 10.33 and viable number was 9.42 and viability rate was 91.2% while in control group the average number of pilets was 8.75 andviable number was 7.0 and viability rate was 80%.