2018, Cilt 34, Sayı 1, Sayfa(lar) 025-035
Fertility and Milk Yield Traits of Different Origins of Holstein Cattle 1. Fertility Traits
Kürşat Alkoyak1, Orhan Çetin2
1Gıda, Tarım ve Hayvancılık Bakanlığı, Tarımsal Araştırmalar ve Politikalar Genel Müdürlüğü, Ankara, Türkiye
2Selçukn Uiversitesi, Veteriner Fakültesi Zootekni Anabilim Dalı, Konya, Türkiye
Keywords: Environmental factors, Reproductive performance, Holstein cattle

Aim: In this study, it was aimed to determine the reproduction traits together with environmental effects on different Holstein breed reared in a private intensive dairy in Kırşehir.

Materials and Methods: The material used in the study was comprised of the data between 2011-2014 of the pregnant Holstein heifers and their calves imported from the USA and Estonia in 2011-2012. In the study, records of 260 cows (118 from USA, 142 from Estonia) for reproductive performance, records of 79 cows from Estonia for first AI dates was analyzed.

Results: At the result of this study the proportional reproductive parameters found as; pregnancy, calving, stillbirth and abortion rates were 95.8 %, 88%, 3.3% and 8.7 %for all cows; 94.3%, 85%, 4% and 10.1% for Estonian Holsteins; 98.5 %, 93.1 %, 2 %, and 4.9% for USA Holsteins respectively. Age at first insemination, interval from first insemination to pregnancy, number of insemination per pregnancy and first calving age of reproductive performance traits were 445.97±3.75 d, 13.04±2.96 d, 1.354±0.076 and 24.590±160 d for Estonian Hosteins.

With regard to reproductive performance parameters; Origin of cows and calving season was significant (P<0.05 and P<0.001) on days to first service and first to last insemination interval (P<0.01 and P<0.05). Origin of Holsteins and calving year was also significant (P<0.001 and P<0.05) on days open and number of insemination per pregnancy(P<0.05 and P<0.05). Origin of Holsteins and calving age had effect on calving interval (P<0.05 and P<0.05). No significant difference was found for gestation length.

Conclusions: It can be concluded from this study that USA Holsteins are preferable to Estonian Holsteins in Kırsehir region of Turkey.