Reliability of the bulk milk somatic cell count as an indication of average herd somatic cell count
| Autor: | Jan Lievaart, Herman W. Barkema, Henk Hogeveen, Wim D.J. Kremer |
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| Rok vydání: | 2009 |
| Předmět: |
Veterinary medicine
Dairy industry Cell Count General Medicine Biology medicine.disease Mastitis Milk yield Animal science Milk Herd medicine Bulk tank Animals Animal Science and Zoology Cattle Female Subclinical mastitis Animal Husbandry Somatic cell count Mastitis Bovine Management practices Food Science |
| Zdroj: | The Journal of dairy research. 76(4) |
| ISSN: | 1469-7629 |
| Popis: | Bulk milk somatic cell count (BMSCC) is a frequently used parameter to estimate the subclinical mastitis prevalence in a dairy herd, but it often differs considerably from the average SCC of all individual cows in milk. In this study, first the sampling variation was determined on 53 dairy farms with a BMSCC ranging from 56 000 to 441 000 cells/ml by collecting five samples on each farm of the same bulk tank. The average absolute sampling variation ranged from 1800 to 19 800 cells/ml. To what extent BMSCC represents all lactating cows was evaluated in another 246 farms by comparing BMSCC to the average herd SCC corrected for milk yield (CHSCC), after the difference was corrected for the sampling variation of BMSCC. On average BMSCC was 49 000 cells/ml lower than CHSCC, ranging from −10 000 cells/ml to 182 000 cells/ml, while the difference increased with an increasing BMSCC. Subsequently, management practices associated with existing differences were identified. Farms with a small ( |
| Databáze: | OpenAIRE |
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