An investigation on milk yield and reproductive performance of Holstein Friesian cows in Kocas state farm 2. Reproductive traits Koçaş tarim işletmesi'nde yetiştirilen Siyah-Alaca siǧrlarin süt ve döl verimleri üzerine bir araştirma 2. Döl verim özellikleri

Duru S., Tuncel E.

Turkish Journal of Veterinary and Animal Sciences, vol.26, no.1, pp.103-107, 2002 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 26 Issue: 1
  • Publication Date: 2002
  • Journal Name: Turkish Journal of Veterinary and Animal Sciences
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.103-107
  • Bursa Uludag University Affiliated: Yes


This research was conducted to determine the characteristics of reproductive performance of Holstein Friesian cows raised at Kocas state farm in Central Anatolia. The material of the research was 362 dairy cows raised from 1988 to 1995 at Kocas State farm. Statistical analysis of records was conducted with the Minitab version 9.2 computer program. Significant differences between groups were determined by the method of Least Significant Difference (LSD). The general mean values of first breeding age, age at first calving, reproductive efficiency, calving interval, gestation length, dry period, service period and insemination number per conception were 18.04±0.10 months, 27.70±0.11 months, 96.50±0.32%, 12.30±0.05 months, 276.50±0.17 days, 65.37±0.78 days, 93.33±1.57 days and 1.33±0.02, respectively.