Emanuelson, Ulf
- Swedish Dairy Association
Abstract
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.
Keywords
dairy cows; mastitis; milk loss
Published in
Acta Veterinaria Scandinavica
1999, volume: 40, number: 1, pages: 47-56
Publisher: DANSKE DYRLAEGEFORENING
SLU Authors
Janson, L.
- Department of Animal Biosciences, Swedish University of Agricultural Sciences
- Department of Animal Biosciences, Swedish University of Agricultural Sciences
UKÄ Subject classification
Other Veterinary Science
Publication identifier
- DOI: https://doi.org/10.1186/bf03547040
Permanent link to this page (URI)
https://res.slu.se/id/publ/48952