Hayvan Bilimi ve Ürünleri Dergisi

Yazarlar: Naci TÜZEMEN

Konular:Ziraat, Sütçülük ve Hayvan Bilimleri

Anahtar Kelimeler:Dairy cattle,Fertility,Calving interval,Breeders associations,Devrekâni

Özet: In this study, some reproductive performance characteristics of cattle raised in two enterprises belonging to Kastamonu Devrekani provincial breeding cattle breeders association were investigated. The mean value of the smallest squares of the first calving age, service period and calving interval of Holstein cattle was 26,931 ± 0,125 months; 174,838 ± 5,335 days; 440,519 ± 3,773 days respectively. As a result of the analysis of variance, the effect of age and age on the first calving age of Holstein cows grown in two different farm in the province of Devrekani is very significant (P<0.01) and seasonal effect is insignificant. In the service period, the effect of the age of the mother was significant (P<0.05), the effect of the season was very significant (P<0.01) and the effect of the enterprise was negligible. Enterprise and age of cow, very important effect on calving interval (P<0.01), while the impact of the seasonal effect was not significant. Reproductive performance and effective factors were found to be positive and significant (P<0.01). İn terms of the correlation coefficients calculated between birth season, cow age, first calving age, service period. However, there were negative and very significant correlations (P<0.01) between the fertility characteristics (excluding service period) and the fertility characteristics that were considered by the enterprise factor.

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