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Chronic subclinical mastitis reduces milk and components yield at the cow level

Published online by Cambridge University Press:  13 May 2020

Larissa Martins ,
Melina Melo Barcelos ,
Roger I. Cue ,
Kevin L. Anderson ,
Marcos Veiga dos Santos  and
Juliano Leonel Gonçalves
Larissa Martins
Affiliation:
Department of Animal Nutrition and Production, School of Veterinary Medicine and Animal Sciences, University of São Paulo, 13635-900 Pirassununga Montreal, Quebec, SP, Brazil
Melina Melo Barcelos
Affiliation:
Department of Animal Nutrition and Production, School of Veterinary Medicine and Animal Sciences, University of São Paulo, 13635-900 Pirassununga Montreal, Quebec, SP, Brazil
Roger I. Cue
Affiliation:
Department of Animal Science, Macdonald Campus, McGill University, H9X-3V9, Canada
Kevin L. Anderson
Affiliation:
Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA
Marcos Veiga dos Santos
Affiliation:
Department of Animal Nutrition and Production, School of Veterinary Medicine and Animal Sciences, University of São Paulo, 13635-900 Pirassununga Montreal, Quebec, SP, Brazil
Juliano Leonel Gonçalves*
Affiliation:
Department of Animal Nutrition and Production, School of Veterinary Medicine and Animal Sciences, University of São Paulo, 13635-900 Pirassununga Montreal, Quebec, SP, Brazil
*
Author for correspondence: Juliano Leonel Goncalves, Email: [email protected]
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Abstract

We evaluated the effects of chronic subclinical mastitis (CSM) caused by different types of pathogens on milk yield and milk components at the cow level. A total of 388 Holstein cows had milk yield measured and were milk sampled three times at intervals of two weeks for determination of SCC and milk composition, and microbiological culture was performed. Cows were considered healthy if all three samples of SCC were ≤200 000 cells/ml and were culture-negative at the third milk sampling. Cows with one result of SCC > 200 000 cells/ml were considered to suffer non-chronic subclinical mastitis whereas cows with at least 2 out of 3 results of SCC > 200 000 cells/ml had CSM. These latter cows were further sorted according to culture results into chronic negative-culture or chronic positive-culture. This resulted in four udder health statuses: healthy, non-chronic, chronicNC or chronicPC. The milk and components yields were evaluated according to the udder health status and by pathogen using a linear mixed effects model. A total of 134 out of 388 cows (34.5%) were chronicPC, 57 cows (14.7%) were chronicNC, 78 cows (20.1%) were non-chronic and 119 cows (30.7%) were considered healthy, which resulted in a grand total of 1164 cow records included in the statistical model. The healthy cows produced more milk than each of the other groups (+2.1 to +5.7 kg/cow/day) and produced higher milk component yields than the chronicPC cows. The healthy cows produced more milk than cows with chronicPC caused by minor (+5.2 kg/cow/day) and major pathogens (+7.1 kg/cow/day) and losses varied from 5.8 to 11.8 kg/cow/day depending on the pathogen causing chronicPC mastitis. Chronic positive-culture cows had a reduction of at least 24.5% of milk yield and 22.4% of total solids yield.

Keywords

Chronicpathogensubclinical mastitis
Type
Research Article
Information
Journal of Dairy Research , Volume 87 , Issue 3 , August 2020 , pp. 298 - 305
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of Hannah Dairy Research Foundation.

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