Effect of Body Condition Score on Estrus-Ovulation Synchronization and Pregnancy in Cows and Heifers

Öz

The most important factors affecting the success of artificial insemination are the balanced nutrition of the animals and the determination of estrus. Malnutrition causes a decrease in the Body Condition Score (BCS). Low BCS affects the deterioration of the metabolism of cows which has a primary influence on estrus and offspring productivity. In this study, estrus and ovulation synchronization was performed by forming three study groups from cows and heifers with a maximum BCS average of 2.95. Cows that were 3 - 6 years old were included in Group I (n = 12) (BCS: 2.95 ± 0.62), heifers between 18-22 months of age and showing at least 1 estrus were included in Group II (n = 13) (BCS: 2.03 ± 0.37) and heifers between 18-22 months of age were included in Group III (n = 45) (BCS: 1.57 ± 0.38). Progesterone Implants remained in the vagina for 10 days in all groups. One day before removal of implants, 2000 IU PMSG and 5 ml PGF2α was injected to all groups. All animals were injected with 1500 IU hCG 24 hours after the implants were removed. After removal of implants, all animals were inseminated at 48 and 72 hours regardless of estrus symptoms. According to the groups, pregnancy rates of 58.33%, 38.46% and 13.33% were obtained, respectively. When the results were compared, it was found that the BCS rate and pregnancy rates were parallel (P<0.01). In line with these results, the importance of feeding and giving birth before has been revealed.

Anahtar Kelimeler

• fertility
• synchronization
• Body Condition Score
• cattle

İnek ve Düvelerde Vücut Kondisyon Skorunun Östrus-Ovulasyon Senkronizasyonu ve Gebelik Üzerine Etkisi

Öz

Suni tohumlamanın başarısını etkileyen en önemli faktörler, hayvanların dengeli beslenmesi ve kızgınlığın belirlenmesidir. Kötü beslenme, Vücut Kondisyon Skorunda (VKS) bir azalmaya neden olur. Düşük VKS, sığırlarda hormon metabolizmasının bozulmasına, kızgınlık tespitinin zorlaşmasına ve döl veriminde azalmaya sebep olur. Bu çalışmada maksimum VKS ortalaması 2.95 olan inek ve düvelerden üç çalışma grubu oluşturularak östrus ve ovulasyon senkronizasyonu gerçekleştirilmiştir. Uygulama grupları; Grup I (n = 12) (VKS: 2.95 ± 0.62), Grup II (n = 13) (VKS: 2.03 ± 0.37) 18 - 22 aylık düvelerde en az 1 doğum yapan 3 - 6 yaş arası inekler, Grup III'de (n = 45) (VKS: 1.57 ± 0.38) en az 1 kızgınlık gösteren 18 - 22 aylık düveler kullanıldı. Tüm gruplarda progesteron implantları vajinada 10 gün kaldı. İmplantlar çıkartılmadan bir gün önce tüm hayvanlara 2000 IU PMSG ve 5 ml PGF2α enjekte edildi. İmplantlar 24 saat sonra çıkarıldı ve 1500 IU hCG enjekte edildi. İmplantlar çıkarıldıktan sonra 48. ve 72. saatlerde östrus semptomlarına bakılmaksızın tüm hayvanlar tohumlandı. Gruplara göre sırasıyla 58.33%, 38.46% ve 13.33% gebelik oranları elde edildi. Sonuçlar karşılaştırıldığında VKS oranı ile gebelik oranlarının paralel olduğu görüldü (P<0.01). Bu sonuçlar doğrultusunda beslenmenin ve daha önce doğum yapmanın önemi ortaya konmuştur.

Anahtar Kelimeler

• senkronizasyon
• Vücut kondisyon skoru
• Fertilite
• Sığır

Kaynakça

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