Sütçü ineklerde lsı stresinin döl verimi üzerine etkisi

Son yıllarda yapılan çalışmalarda özellikle tropikal bölgelerde ısı stresinin önemli bir infertilite nedeni olduğu ortaya konmuştur. Türkiye’nin de içinde bulunduğu kuzey yarımkürede yaz aylarında çevre sıcaklığı ortalama 21°C ve üzerinde seyretmektedir. Bu sıcaklık seviyesi, özellikle sütçü ineklerde verimin düşmeye başladığı kritik değerdir. Dolayısıyla, hayvanlar yılda 3–5 ay kadar önemli ölçüde ısı stresine maruz kalmaktadırlar. Stresin şiddeti ile doğrusal orantılı hastalık ve mortalite riski artmakta, gelişme, büyüme, süt üretimi ve üreme fonksiyonları değişime uğramaktadır. Bu nedenle, bu derlemede ısı stresinin fertilite üzerine etkisi hakkında kapsamlı bilgiler verilecektir.

Anahtar Kelimeler:

sıcaklık stresi, döl verimi, süt ineği, sığır, kızgınlık, üreme davranışı, stres yanıtı

The effect of heat stress on fertility in dairy cows

With the recent studies, it was concluded that heat stress is a significant infertility reason particularly in tropical regions. In the Northern Hemisphere, the mean temperature in summer months is 21°C and above it. This temperature level is a threshold for the decreasing fertility in dairy cows. Hence, animals are exposed to a considerable heat stress during 3-5 months per year. With the severity of stress, both the risk of disease and mortality increase, on the other hand, growing, milk production, reproduction functions vary as well. Therefore, in this review comprehensive informations will be presented about the effect of heat stress on fertility.

Keywords:

heat stress, fertility, dairy cows, cattle, oestrus, reproductive behaviour, stress response,

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