Repeated superovulation treatments in Kivircik ewes during breeding and nonbreeding seasons

Authors : Burcu ÜSTÜNER, Selim ALÇAY, Yavuz NAK, Zekariya NUR

Pages : 480-484

Doi:10.3906/vet-1401-20

View : 16 | Download : 3

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The present study compared superovulation and embryo recovery rates applied repeatedly during breeding and nonbreeding seasons in the same 20 Kivircik sheep. Trials 1 and 3 were performed during the breeding season and the trial 2 was performed in the nonbreeding season. We synchronized the sheep`s estrus cycles and induced a superovulatory response with porcine follicle stimulating hormone insert ignore into journalissuearticles values(pFSH); injections. Natural mating took place 12 h after the last FSH injection. The embryos were collected by laparotomy 7 days after natural mating. There was no significant difference between the number of corpora lutea insert ignore into journalissuearticles values(CL); counted following the 1st insert ignore into journalissuearticles values(breeding); and 2nd insert ignore into journalissuearticles values(nonbreeding); superovulatory treatments insert ignore into journalissuearticles values(P > 0.05);. However, the number of CL in the 3rd insert ignore into journalissuearticles values(breeding); treatment was dramatically lower than that in the other groups insert ignore into journalissuearticles values(P < 0.001);. Recovery rates showed significant differences among embryo flushing treatments insert ignore into journalissuearticles values(P < 0.001);. The number of morulae + blastocysts and freezable-quality embryos decreased considerably for the 3rd flushing treatment insert ignore into journalissuearticles values(P < 0.001);, while no significant difference was observed between the 1st and 2nd flushing treatments insert ignore into journalissuearticles values(P > 0.05);. In conclusion, our study demonstrated that 2 consecutive in vivo embryo production programs can be successfully applied in Kivircik ewes with suitable superovulation treatments and operation techniques, irrespective of the season.
Keywords : Sheep, superovulation, embryo, FSH