Determining the optimum voluntary waiting period and synchronization protocol in Simmental cows

Year 2023, Volume: 16 Issue: 3, 401 - 409, 30.09.2023

Uğur Kara Mehmet Düzer Hatice Hızlı Duygu Baki Acar

https://doi.org/10.30607/kvj.1282056

Abstract

The objective of the present study was to compare four different synchronization protocols at the end of various voluntary waiting period (VWP) and evaluate the effect of parity and milk yield on pregnancy rates with synchronization in Simmental cows. All animals were randomly allocated into four synchronization groups and one control group. Parity, milk yield (≤23 kg/d; >23 kg/d), and days in milk (DIM; 45-60, 61-90, >90 days) were compared according to synchronization protocols. Ovsynch (Group I; n=81), Ovsynch+Progesterone (Group II; n=30), G6G (Group III; n=66), 2xG6G (Group IV; n=45), and a control group (n=35) were designed for the study. The parity significantly affected the pregnancy rates in the primiparous cows, especially in Group II (P<0.05). The pregnancy rates between synchronization and control groups did not differ significantly (P>0.05). There was no significant difference between milk yield and pregnancy rates (P>0.05). In conclusion, the synchronization of Simmental cows with Ovsynch, Ovsynch+Progesterone, G6G, or 2xG6G did not affect pregnancy rates across various DIM. These data suggest that the suitable VWP could be planned according to the farm’s economic and local market targets, with veterinarians able to choose a protocol based on practicality, effectiveness and cost, as well as the specific requirements of the herd.

Keywords

Simmental Cow, Synchronization, Woluntary Waiting Period

Supporting Institution

No support was received during this study.

Project Number

-

Simmental Irkı İneklerde Optimum Gönüllü Bekleme Süresi ve Senkronizasyon Programının Belirlenmesi

Abstract

Bu çalışmanın amacı, Simental ırkı ineklerde farklı gönüllü bekleme sürelerinin (GBS) sonunda dört farklı senkronizasyon programının etkinliğinin karşılaştırılması, doğum sayısı ve süt veriminin bu senkronizasyon protokolleri ile gebelik oranlarına etkilerinin değerlendirilmesidir. Hayvanlar rastlantısal olarak dört farklı senkronizasyon ve bir kontrol grubuna ayrıldı. Doğum sayısı, süt verimi (≤23 kg/gün; >23 kg/gün) ve sağılan gün sayısının (SGS; 45-60, 61-90, >90 günler) uygulanan senkronizasyon protokollerine etkileri karşılaştırıldı. Ovsynch (Grup I; n=81), Ovsynch+Progesteron (Grup II; n=30), G6G (Grup III; n=66), 2xG6G (Grup IV; n=45) ve kontrol (n=35) grupları oluşturuldu. Doğum sayısının gebelik oranlarına etkisi karşılaştırıldığında, ilk laktasyondaki primipar ineklerde multipar ineklere göre özellikle Grup II’de istatistiksel önemin (P<0,05) yüksek olduğu tespit edildi. Senkronizasyon ve kontrol grupları arasında gebelik oranları bakımından fark gözlenmezken (P>0,05), süt veriminin de gebelik oranı üzerinde istatistiksel öneme yol açmadığı (P>0,05) belirlendi. Sonuç olarak, Simental ırkı ineklerin Ovsynch, Ovsynch+Progesteron, G6G ve 2xG6G protokolleri ile senkronizasyonunun farklı sağılan gün sayısı (SGS)’na göre gebelik oranlarını etkilemediği belirlendi. Sunulan çalışmadan elde edilen veriler veteriner hekimlerin pratik, etkili, uygun maliyetli ve çiftliğin özel ihtiyaçlarını karşılayabilecek yukarıda belirtilen herhangi bir senkronizasyon protokolünü seçebileceğini, en uygun gönüllü bekleme süresinin ise çiftliğin ekonomik ve bölgesel piyasa hedeflerine göre planlanmasının daha etkili ve verimli olacağını ortaya koymaktadır.

Keywords

Simental İnek, Senkronizasyon, Gönüllü Bekleme Süresi

Project Number

-

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