Physiological Mechanisms of Multiple Ovulations and Factors Affecting Twin Calving Rates in Cattle

Öz

Anahtar Kelimeler

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Physiological Mechanisms of Multiple Ovulations and Factors Affecting Twin Calving Rates in Cattle

Öz

Büyük baş hayvanlarda üreme çok çeşitli faktörlerden etkilenmektedir. Bu faktörler hayvanların üreme performansında gözlenen bazı varyasyonu açıklar niteliktedir. Doğumda ikizlik görülme sıklığını değerlendirmek için kapsamlı birçok çalışma, süt ve et ırkı büyükbaş hayvanlarda yapılmıştır. Bu anlamda, sığırlarda üreme sistemi üzerine etkili pek çok çevresel ve genetik faktörler oldukça geniş bir şekilde ele alınmıştır. Sığırlarda çoklu doğumun görülme oranı çok düşük olsa bile, ırk farklılıkları, besleme ve yönetim sistemleri ve bunun yanında doğum sırası, ana yaşı, yılın mevsimi ve yetiştirilen hayvanın coğrafik konumu gibi değişik çevre faktörleri de ikiz doğum oranı üzerine etkili bazı varyasyonun görülmesine neden olabilmektedir. Dolayısıyla, bu derlemenin amacı sığırlarda çoklu ovulasyonu düzenleyen fizyolojik mekanizmayı ve aynı zamanda büyükbaş hayvan yetiştiriciliğinde çoklu doğumu olumlu ya da olumsuz yönde etkileyen bazı önemli faktörleri vurgulamak ve açıklamaktır

Anahtar Kelimeler

• Çift ovulasyon, foliküler gelişim, ikiz buzağılama, risk faktörleri, doğum sırası ve mevsimsel etkiler, ırk farklılığı

Kaynakça

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