The aim of this study was to evaluate the suitability of clinical mastitis (CM) observations routinely recorded by dairy farmers in their farm management software. A group of 202 dairy farmers recorded CM treatments during 30 202 lactations of 18 758 Holstein Friesian cattle. Incidences of CM during the first 210 days of lactation increased from 12% in first parity to 19% in third parity. Heritabilities of CM ranged from 0.03-0.05 and genetic correlations among parities are high (0.81 to 0.92). The results of this study indicate that CM data routinely recorded by dairy farmers in using management software systems can be useful for selection purposes.

E. PC Koenen, W. Steeneveld

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 01.64, 2006
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