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Research article - Peer-reviewed, 1999

Relation of milk production loss to milk somatic cell count

Koldeweij, E.; Emanuelson, Ulf; Janson, L.


The average daily milk yield was 19.7 kg/day in first lactation and 22.0 in later lactations. The geometric mean of SCC was 63.1 in first lactation and 107.2 in later lactations. The incidence of clinical mastitis treated by a veterinarian was 19.8% of the lactations-at-risk. Linear relationships were found between the production parameters and Log(10)(SCC). Quadratic and cubic effects were evaluated, but were found to contribute little to the overall fit of the models. The individual milk yield loss was 1.29 kg/day for each unit increase in Log(10)(SCC) for cows in first lactation. Milk yield decreased by 2.04 kg/day per unit Log(10)(SCC) for older cows. Corresponding values for protein yield were 0.042 and 0.067 kg/day for first and later lactations, respectively.


dairy cows; mastitis; milk loss

Published in

Acta Veterinaria Scandinavica
1999, Volume: 40, number: 1, pages: 47-56