Authors : R.D. Martinez-Rojero , J. Hernandez , L. Reyna and R. Santos
Abstract: In order to evaluate the fertility rate in Creole goats synchronized in estrous during the nonbreeding season and inseminated into the uterus with frozen-thawed semen or mating by fertile male 24 h after estrus detection, a study was carried out in Southern of Mexico, at 18 15�NL. Ninety multiparous (from 1 to 4 parity) non cycling Creole goats an five males (four Nubian and one Boer bucks) were utilized. Goats were synchronized in estrous by means of intravaginal sponges containing 40 mg of FGA during 11 d, plus an intramuscular injection of eCG (200 IU) at moment that sponges were withdrawal. Only 73 females showed heat manifestations. Twelve hours after estrous detection, 37 does receiving natural mating, while rest 36 goats were inseminated into the uterus by laparoscopy with frozen- thawed semen obtained from Boer male (100 million of spermatozoids), five month later fertility rate was registered. Chi-square test was utilized. No difference was found (p>0.05) for fertility rate between artificial insemination (33.3%) and natural mating (51.3%). It concluded that fertility rate registered inseminated into the uterus with thawed-frozen semen is similar that fertility registered in Creole goats receiving natural mating, synchronized in estrous during non reproductive season.
R.D. Martinez-Rojero , J. Hernandez , L. Reyna and R. Santos , 2007. Intrauterine Insemination with Frozen-Thawed Semen in Creole Goats, Synchronized in Estrous During the Nonbreeding Season . Research Journal of Animal Sciences, 1: 76-80.