The productive and reproductive traits of friesian cows in Egypt [electronic resource].

Includes references.

Data relevant to 654 Friesian cows Raised at the Dairy Unit of Milk and Meat Project of the Faculty of Agriculture, Alexandria University, between 1982-1999 were utilized to evaluate the productive and reproductive traits of Friesian cows. Also, The effects of sire, age at first calving, season and year of calving and parity were studied. The least squares analysis with unequal subclass numbers indicated that the overall least squares means of total milk yield. 305-days milk yield. lactation period. average daily milk yield. maximum daily milk yield. persistency and dry period were 4237.8 kg, 3948.2 kg, 302.7 day, 14./ kg. 22.5 kg. 174.1 and 75.1 day, in respective order. Corresponding means for age at first calving, days open and calving interval were 29.6 month. 126.3 day and 399.8 day, respectively. Sire had highly significant effect on all studied traits except the lactation period where the effect was not-significant. Age at first calving had no significant effect on any of the traits under investigation except average daily milk yield which was highly significantly affected Season of calving had highly significant effect on total milk yield , 305-days milk yield. average daily milk yield. maximum daily milk yield. persistency and age at first calving. but had no significant effect on lactation period. dry period. days open and calving interval. Year of calving and parity had highly significant influence on all studied traits except dry period which Was influenced only significantly and no significantly, respectively.

Summary in Arabic.

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