کلیدواژهها
عنوان مقاله English
نویسندگان English
In present study to evaluate reproductive traits in Holstein cows, 792 records from 405 dairy cows that calved during 2006 to 2014 were analyzed. Repeated linear model was used to statistical analysis of days to first services, interval from first to last insemination and open days. The mean values for days to first services, interval from first to last insemination and open days was 80.0, 52.0 and 134.1 days, respectively. Least-squares means in days to first service traits were different among the herds, years and season of the birth (P 0.05), while in open days' trait only herds and calving years were significantly different (P < 0.05) and the parities and calving season were ineffective on this trait (P>0.05). However, from first to last insemination trait, only the number of services affect this trait (P
کلیدواژهها English
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