Bülent BALLİ, Mehmet CENGİZ, Armağan HAYIRLI

Soğuk şartların süt ineklerinde gebelik oranları üzerindeki olumsuz etkileri

Bu çalışma, soğuk ve ılık mevsimlerde 70 adet sağlıklı Fleckvieh sütçü ineklere uygulanan iki seksüel senkronizasyon programı sonrası gebelik oranlarını değerlendirmek amacıyla gerçekleştirildi. Doğum sonrası 35. günde, inekler gerçek doğum tarihine göre eşleştirdikten sonra [soğuk mevsim (-38 to 0 ºC) (Kasım - Şubat), ılık mevsim (0 to 32 ºC) (Mart - Ekim)], Co-Synch (CoS) veya çift doz PGF2α enjeksiyon (dPG) protokol gruplarına rastgele dağıtıldı. İlk tohumlamada gebelik oranının belirlenmesi için 2 analizi uygulandı. İlk tohumlamada toplam gebelik oranı, sırasıyla Grup CoS ve dPG için , 57,1 ve 40,0 (2 = 2,03, P = 0,15) ve soğuk ve sıcak mevsimler için % 35,0 ve 66,7 (2 = 6,78, P = 0,009) olarak bulundu. Soğuk (2 = 1.17, P = 0,28) ve sıcak mevsimler (2 = 1,62, P = 0,20) için ilk tohumlamada gebelik oranı üzerine protokol etkisi belirgin değildi. Özetle, soğuk şartlar ilk tohumlamada gebelik oranını olumsuz etkiledi. İnekler soğuk şartlara maruz bırakıldığında senkronizasyon protokolüne bağlı olarak gebelik oranı değişmedi.

The negative effects of cold conditions on pregnancy rates in dairy cows

This study was conducted to determine the pregnancy rate in response to two sexual synchronization protocols in 70 healthy multiparous Fleckvieh dairy cows during the cold and warm seasons. After pairing by the actual parturition date [cold seasons (-38 to 0 ºC) (Nov - Feb) vs. warm seasons (0 to 32 ºC) (Mar-Oct)], cows were randomly subjected to either Co-Synch (CoS) or double PGF2α injection (dPG) on d 35 postpartum. Data were subjected to Chi-Square (2) analysis to determine the pregnancy rate at the first service. Overall pregnancy rates (%) at the first service were 57.1 and 40.0 for Groups CoS and dPG, respectively (2 = 2.03, P = 0.15) and 35.0 and 66.7% during cold and warm seasons, respectively (2 = 6.78, P = 0.009). The protocol effect on the pregnancy rate at the first service was insignificant during cold (2 = 1.17, P = 0.28) and warm (2 = 1.62, P = 0.20) season. In summary, the cold conditions negatively affected the pregnancy rate at the first service. The synchronization protocol methods did not differ to improve the pregnancy rate at the first service when cows were exposed to cold conditions.

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