Early Growth in Brown Swiss and Holstein Cattle

Yıl 2021, Cilt: 16 Sayı: 1, 1 - 7, 26.04.2021

Ömer Coban , Murat Genç , Ali Osman Kesen

Öz

The study was carried out to determine the effects of race, gender, birth season, lactation order, body condition score (BCS) values of dams before birth, maternal BMD value, milk yields in previous lactation, lactation period and dry period length on growth in Brown Swiss and Holstein calves up to 12 weeks of age. A total of 90 calves born between 04.10.2012 and 31.12.2013 were used for the data of the mother and calves. Brown Swiss calves had higher live weight than Holstein calves from birth to 12 weeks of age. The lowest birth weight was observed in calves born in summer (37.3±2.31 kg). It was determined that the k value calculated with the Gompertz growth model in the period from birth to the age of 12 weeks is successful in explaining the growth. There was no relationship between BCS value of mothers before birth, milk yield, lactation order, dry period length and birth weight and live weights in other periods. It has been concluded that race, sex and parity are effective factors on growth until 12 weeks of age. Considering that the optimum level of early growth may affect the long-term performance of these animals, it will be beneficial to develop feeding programs by determining energy and protein values that are appropriate for at least macro environmental conditions.

Anahtar Kelimeler

Breed, calf, growth, growth model

Esmer ve Siyah Alaca Sığırlarda Erken Dönem Büyüme

Öz

Çalışma, Esmer ve Siyah Alaca buzağılarda 12 haftalık yaş dönemine kadar ırk, cinsiyet, doğum mevsimi, laktasyon sırası, anaların doğum öncesi vücut kondisyon skoru (VKS) değerleri, anaların bir önceki laktasyondaki süt verimleri, laktasyon süresi ve kuru dönem uzunluğunun büyüme üzerine etkilerinin belirlenmesi amacı ile yapılmıştır. Ana ve buzağılara ait veriler için 04.10.2012 ile 31.12.2013 tarihleri arasında doğan toplam 90 baş buzağı kullanılmıştır. Esmer buzağılar doğumdan 12 haftalık yaşa kadar Siyah Alaca buzağılardan daha yüksek canlı ağırlığa sahip olmuşlardır. En düşük doğum ağırlığı yaz mevsiminde doğan buzağılarda (37.3±2.31 kg) gözlenmiştir. Doğumdan itibaren 12 haftalık yaşa kadarki dönemde Gompertz büyüme modeli ile hesaplanan k değerinin büyümeyi açıklamada başarılı olduğu belirlenmiştir. Anaların doğumdan önceki VKS değeri, süt verimi, laktasyon sırası ve kuru dönem uzunluğu ile doğum ağırlığı ve diğer dönemlerdeki canlı ağırlıklar arasında ilişki belirlenememiştir. Irk, cinsiyet ve laktasyon sırasının 12 haftalık yaş dönemine kadarki büyüme üzerine etkili faktörler olduğu sonucuna varılmıştır. Optimum erken büyüme düzeyinin bu hayvanların uzun vadeli performansını etkileyebileceği düşünüldüğünde, en azından makro çevre koşullarına uygun enerji ve protein değerleri belirlenerek beslenme programlarının geliştirilmesi faydalı olacaktır.

Anahtar Kelimeler

Buzağı, büyüme, büyüme modeli, ırk

Kaynakça

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