The Effectiveness of Cosynch Protocol in Dairy Heifers and Multiparous Cows

The aim of the present study was to evaluate the effects of Cosynch protocol on some reproductive parameters in Holstein multiparous cows (MC) (n = 54) and heifers (n = 53). Follicular development, presence of corpus luteum (CL) at different stages of Cosynch protocol, ovulation time and pregnancy rates were evaluated by ultrasonography in MCs and heifers. Pregnancy rates (PR) in MCs and heifers were found as 41% and 51% (P: 0.29, Z: -1.06). At the time of first Gonadotropinreleasing hormone (GnRH) (GnRH1), Prostaglandin F2a (PGF2a) and final GnRH (GnRH2) injections, PRs in heifers and MCs which had CL on their ovaries were detected as 47.4%-48.7% (P: 0.91, Z: 0.12), 60.5%-48.7% (P: 0. 30, Z: -1.4) and 62.1%-36.4% (P: 0.031, Z: -2.15) respectively. Ovulations occurred in 24-30 h interval after artificial insemination (AI) in MCs (50%) and heifers (35%) (P: 0.13, Z: 1.51). In conclusion, Cosynch protocol was found more effective and practical in heifers than MCs. In addition, ovulations that occurred before AI could be the reason of low conception rate for Ovsynch procedure in heifers.

The Effectiveness of Cosynch Protocol in Dairy Heifers and Multiparous Cows

The aim of the present study was to evaluate the effects of Cosynch protocol on some reproductive parameters in Holstein multiparous cows (MC) (n = 54) and heifers (n = 53). Follicular development, presence of corpus luteum (CL) at different stages of Cosynch protocol, ovulation time and pregnancy rates were evaluated by ultrasonography in MCs and heifers. Pregnancy rates (PR) in MCs and heifers were found as 41% and 51% (P: 0.29, Z: -1.06). At the time of first Gonadotropinreleasing hormone (GnRH) (GnRH1), Prostaglandin F2a (PGF2a) and final GnRH (GnRH2) injections, PRs in heifers and MCs which had CL on their ovaries were detected as 47.4%-48.7% (P: 0.91, Z: 0.12), 60.5%-48.7% (P: 0. 30, Z: -1.4) and 62.1%-36.4% (P: 0.031, Z: -2.15) respectively. Ovulations occurred in 24-30 h interval after artificial insemination (AI) in MCs (50%) and heifers (35%) (P: 0.13, Z: 1.51). In conclusion, Cosynch protocol was found more effective and practical in heifers than MCs. In addition, ovulations that occurred before AI could be the reason of low conception rate for Ovsynch procedure in heifers.

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Turkish Journal of Veterinary and Animal Sciences-Cover
  • ISSN: 1300-0128
  • Yayın Aralığı: Yılda 6 Sayı
  • Yayıncı: TÜBİTAK
Sayıdaki Diğer Makaleler

The effectiveness of Cosynch protocol in dairy heifers and multiparous

Orkun DEMİRAL, Murat ABAY, Tayfur BEKYÜREK, Mustafa ÜN, Ahmet ÖZTÜRK

Detection of Slime Factor Production and Antibiotic Resistance in Staphylococcus Strains Isolated from Various Animal Clinical Samples

Süheyla TÜRKYILMAZ, Seza ESKİİZMİRLİLER

The Effects of Bacterial Inoculants on the Fermentation, Aerobic Stability and Rumen Degradability Characteristics of Wheat Silages

Ekin SUCU, İsmail FİLYA

Effects of Double Injections of PGF2a at Different Intervals on Some Reproductive Traits in Tuj Ewes

Nalan BAYŞU SÖZBİLİR, Şaban MARAŞLI, Yavuz ÖZTÜRKLER, Ömer UÇAR

Comparison of Polymerase Chain Reaction and Conventional Methods for the Diagnosis of Listeria monocytogenes in Stuffed Mussels

Ergün Ö. GÖKSOY, Şükrü KIRKAN, Osman KAYA

In vitro effects of prostaglandin F2 $alpha$ and metamizol on the motility of diluted bull semen

Gaffari TÜRK, Seyfettin GÜR, İzzet KARAHAN

In Vitro Effects of Prostaglandin F2a and Metamizol on the Motility of Diluted Bull Semen

İzzet KARAHAN, Gaffari TÜRK, Seyfettin GÜR

Plasma Ascorbic Acid Levels in Lambs With Coccidiosis

Şima ŞAHİNDURAN, Kenan SEZER, Tülay BÜYÜKOĞLU, Bayram Ali YUKARI, Metin Koray ALBAY

Effect of the Hatching Month as an Environmental Factor on the Hatching Features of Bronze Turkeys

Mahiye ÖZÇELİK, Harun CERİT, Fikriye EKMEN, İsmet DOĞAN

The Effectiveness of Cosynch Protocol in Dairy Heifers and Multiparous Cows

Orkun DEMİRAL, Mustafa ÜN, Murat ABAY, Tayfur BEKYÜREK, Ahmet ÖZTÜRK