INHERITANCE OF CLINICAL MASTITIS AND THEIR RELATIONSHIP WITH MILK PRODUCTION IN FRIESIAN COWS IN EGYPT

Document Type : Research article

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Abstract

The data used in this investigation were taken from 285 Friesian Cows in two farms belonging to Ministry of Defense at two locations, in Rass El-Soda in Alexandria and the other in Shobra Shehab near Cairo. The average 305-days milk p < /strong>roduction of 112 cows affected with mastitis in their first or second lactation in the two farms was 3506 kgs, while the average of comparable but healthy 173 cows was 2921 kgs, the differ ence was highly significant. The regression of daily milk yield during eleven days before the onset of mastitis in affected cows was found to be 0.155 while that obtained for the eleven days after treatments was -0.008, the difference between two regression was found to be highly significant. The heritability of mastitis (using regression of daughters on dam) was found to be relatively high (0.52).

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