Repeated superovulation treatments in Kivircik ewes during breeding and nonbreeding seasons

ÜSTÜNER B., ALÇAY S., NAK Y., NUR Z., NAK D., Tuna B., ...More

TURKISH JOURNAL OF VETERINARY & ANIMAL SCIENCES, vol.38, no.5, pp.480-484, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 38 Issue: 5
  • Publication Date: 2014
  • Doi Number: 10.3906/vet-1401-20
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.480-484
  • Bursa Uludag University Affiliated: Yes


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 (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 (CL) counted following the 1st (breeding) and 2nd (nonbreeding) superovulatory treatments (P > 0.05). However, the number Of CL in the 3rd (breeding) treatment was dramatically lower than that in the other groups (P < 0.001). Recovery rates showed significant differences among embryo flushing treatments (P < 0.001). The number of morulae + blastocysts and freezable-quality embryos decreased considerably for the 3rd flushing treatment (P < 0.001), while no significant difference was observed between the 1st and 2nd flushing treatments (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.