The estimation of genetic parameters for holstein cattle raised in Kirsehir

In this study, 4589 milk yield records of Holstein cows raised in 389 farms located in Kırşehir Cattle Breeders Association between 2007-2017 were used. Of milk yield characteristics, 305 days of milk yield (DMY), lactation lenght (LL) and dry period (DP), and effects of calving year, parity, calving season, calving age and farm size on these factors were determined. In present study, the overall mean of 305 DMY, LL and DP were calculated as 7350,5 ± 30,70 kg, 398,2 ± 1,61 days and 62,5 ± 17,02 days, respectively. Effects of calving year, parity, calving season and farm size on 305 DMY and LL were statically important (p<0,01). Effects of calving year and farm structure on DP were statically important (P>0,05), but effects of parity and calving season on its were non important. Heritability and repeabilty for 305 DMY, LL and DP were determined as 0,23, 0,07 and <0,01;0,23, 0,14 and 0,02, respectively. In addition, breeding value was calculated as -8.58 kg \ year. To conclude, it can be believed that milk yield traits and genetic parameter estimations calculated for Hostein cows raised in Kırşehir province were will be quide for breeding studies in future genearations.