Comparison of milk production of the progeny of BLAD-carrier and healthy Holstein bulls in Hungary
1999
Janosa, A. | Baranyai, B. | Dohy, J.
The relationship between bovine leukocyte adhesion deficiency (BLAD) genotype of bulls, their breeding value for milk yield, milk fat yield and milk protein yield of their daughters was investigated. BLAD-carrier and healthy bulls were compared on the basis of their breeding value published in November 1997. The first 100 bulls ranked according to the total production index were used, including 9 BLAD carriers and 77 healthy sires with 2835 and 21 950 daughters respectively. The BLAD genotype was not indicated for 14 bulls. The healthy animals significantly outperformed the BLAD carriers. It is concluded that in a BLAD elimination programme, the identification of BLAD carriers and planned mating are required to avoid 'inter se' mating of BLAD-carrier top bulls.
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