Short Communication: Association Between Milk Yield at Dry-Off and Probability of Intramammary Infections at Calving
| Autor: | Päivi J. Rajala-Schultz, K.L. Smith, J.S. Hogan |
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| Rok vydání: | 2005 |
| Předmět: |
Ice calving
Biology Intramammary infection Milk yield Animal science Pregnancy Genetics Clustered data medicine Animals Lactation Significant risk Mastitis Bovine business.industry Parturition food and beverages Milk production medicine.disease Biotechnology Mastitis Herd Cattle Female Animal Science and Zoology business Food Science |
| Zdroj: | Journal of Dairy Science. 88:577-579 |
| ISSN: | 0022-0302 |
| Popis: | The association between milk yield at dry-off and intramammary infections at calving was evaluated from 116 lactations in one herd. Duplicate quarter samples were collected within 3 d after calving to estimate prevalence of intramammary infection at calving; information on cows' parity, daily milk yields, weekly somatic cell counts, and dry-off and calving dates were available for the data analyses. Generalized linear models with logit link were used to model the probability of a cow or a quarter being infected at calving, accounting for the clustered data. Increasing milk production at dry-off was a significant risk factor for both a cow and a quarter being infected with environmental pathogens at calving, but infections caused by coagulase-negative staphylococci at calving were not associated with milk yield at dry-off. For every 5-kg increase in milk yield at dry-off above 12.5 kg, the odds of a cow having an environmental intramammary infection at calving increased at least by 77%. |
| Databáze: | OpenAIRE |
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