STUDYING SOME NON-GENETIC FACTORS ON MILK PRODUCTION IN FRIESIAN

Abstract

The research was conducted on 71 Friesian cows reared in one of the cattle in the area of civil Qushtapa / Erbil for the years 2009 and 2010 to study the effect of Non genetic factors (year of calving, age at first birth, the sequence of birth, season of birth, and sex) in the daily milk production, in addition to study the effect of number of vaccination requested for fertilization calving interval and dry period in the milk production. The overall average of daily milk production was (19.958) kg. The results showed that for the year of calving, the sequence of birth and season of birth have a significant (p <0.01) in the daily milk production . Also found that efficiency fertilizing substances in cattle herds civil high as the number of cows which had been vaccinated with fertilizing vaccine in the first and second time in 55 cows from the whole cattle (71 cows) with 77.46%.It was also noted that the length of the period between calving within the period 361-390 days, where production was high, amounting to 21.788 kg / day was also evident that the ideal length of dry period in this study was from 46-60 days.