Production traits in holstein friesian x deoni crossbred cows

Data representing 287 Holstein Friesian x Deoni cows over a 30 years period were analysed to determine the effect of Age at first calving, season of calving and period of calving on production traits. The overall least squares means of lactation milk yield, peak milk yield, days to reach peak milk yield, lactation period and dry period were 1466.15 32.91, 7.44 0.02, 35.68 0.18, 291.95 2.37 and 144.20 3.91. The age at first calving had non significant effect on all production traits except Lactation milk yield (LMY). The variation in season of calving on production traits were non significant except lactation period. The period of calving had significant effect on peak milk yield and days to reach peak milk yield, whereas it did not significantly affected lactation milk yield, lactation period and dry period.