2022-03-172022-03-172002Duru, S. ve Tuncel, E. (2002). "Koçaş Tarım İşletmesinde yetiştirilen siyah-alaca sığırların süt ve döl verimleri üzerine bir araştırma 2. döl verim özellikleri". Turkish Journal of Veterinary & Animal Science, 26(1), 103-107.1300-0128http://hdl.handle.net/11452/25122This 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.trinfo:eu-repo/semantics/openAccessReproductive performanceCalving intervalDays openDry periodGestation lengthHolstein-friesianReproductive efficiencyArticle0001743394000162-s2.0-18244427456103107261Veterinary sciencesMilk Yield; Simmental; CalvingMilkArtificial inseminationArticleBreedingComputer programConceptionControlled studyDairy cattleNonhumanMorphological traitPerformancePregnancyReproductionStatistical analysis