Comparison of Pregnancy Rates after Timed Artificial Insemination in Ovsynch, Heatsynch and CIDR-Based Synchronization Protocol in Dairy Cows

Çevik M., Selçuk M., Dogan S.

KAFKAS UNIVERSITESI VETERINER FAKULTESI DERGISI, cilt.16, sa.1, ss.85-89, 2010 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 16 Sayı: 1
  • Basım Tarihi: 2010
  • Dergi Adı: KAFKAS UNIVERSITESI VETERINER FAKULTESI DERGISI
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.85-89
  • Anahtar Kelimeler: Estrus synchronization, Ovsynch, Heatsynch, CIDR, Dairy cow, FOLLICULAR WAVE EMERGENCE, 2 ESTRUS SYNCHRONIZATION, ESTRADIOL CYPIONATE, PROGESTERONE INSERT, BETA-CAROTENE, BEEF HEIFERS, OVULATION, CATTLE, RESYNCHRONIZATION, PROGRAMS
  • Ondokuz Mayıs Üniversitesi Adresli: Evet

Özet

The objective of this study was to compare the effects of three different estrus synchronization protocols on the pregnancy rates of lactating dairy cows. Group 1 (Ovsynch protocol; n=20) animals received 20 mu g GnRH on day 0, 500 mu g PGF2 alpha on day 7 and 20 mu g GnRH on day 9; Group 2 (Heatsynch protocol; n=20) received 20 mu g GnRH on day 0, 500 mu g PGF2 alpha on day 7 and an injection of 1 ml estradiol cypionate i.m. on day 8; Group 3 (CIDR protocol; n=20) an intravaginal CIDR insertion on day 0, inject with 500 mu g PGF2 alpha on day 6, and removed CIDR on day 7. All animals were fixed-time artificial inseminated (FTAI) on day 10. Pregnancy diagnosis was performed on all animals via transrectal ultrasonography at 35+/-3 days following FTAI. Estrus activity observed in the Heatsynch group animals was higher than that in the Ovsynch and CIDR-based groups (P<0.05). There were significant differences among groups for vaginal electrical resistance in days 7 and 10 (P<0.05), but there was no significant difference among groups on first and second service pregnancy rates (P>0.05). In conclusion, these three synchronization protocols providing satisfactory pregnancy rates in lactating dairy cows can be equally usable.