In genetic evaluation of mastitis in first-lactation Norwegian Cattle (NRF), the trait is treated as binary. The score is based on whether or not a cow has had at least one case of veterinary treated clinical mastitis (CM) in the period going from 15 days before to 120 days after calving (Heringstad et al., 2000). This definition does not utilize fully the information available from the Norwegian health recording system, where all veterinary treatments are recorded. Some cows have several mastitis treatments during lactation and, also, the date of treatment is known, so it is possible to ascertain at what stage of lactation the disease takes place.

Y. M Chang, Daniel Gianola, B. Heringstad, G. Klemetsdal

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 16, , 20.03, 2002
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