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Associations of the first occurrence of pathogen-specific clinical mastitis with milk yield and milk composition in dairy cows

Published online by Cambridge University Press:  13 August 2018

Mitsunori Kayano ,
Megumi Itoh ,
Nobuyuki Kusaba ,
Osamu Hayashiguchi ,
Katsuya Kida ,
Yoshiharu Tanaka ,
Keiko Kawamoto  and
Yrjö T Gröhn
Mitsunori Kayano*
Affiliation:
Research Center for Global Agromedicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan Field Science Center, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan
Megumi Itoh
Affiliation:
Department of Applied Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan
Nobuyuki Kusaba
Affiliation:
Large Animal Clinic and Research Center, Federation of Hokkaido Agricultural Mutual Aid Associations, Sapporo, Japan
Osamu Hayashiguchi
Affiliation:
Department of Animal Husbandry, Federation of Tokachi Agricultural Mutual Aid Associations, Obihiro, Japan
Katsuya Kida
Affiliation:
Field Science Center, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan
Yoshiharu Tanaka
Affiliation:
Hokkaido Dairy Milk Recording and Testing Association, Sapporo, Japan
Keiko Kawamoto
Affiliation:
Research Center for Global Agromedicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan Department of Applied Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan
Yrjö T Gröhn
Affiliation:
Section of Epidemiology, Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, USA
*
*For correspondence; e-mail: kayano@obihiro.ac.jp
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Abstract

The aim of this study was to estimate the associations of the first occurrence of pathogen-specific clinical mastitis (CM) with milk yield and milk composition (somatic cell count (SCC), lactose, fat, protein content in milk and milk urea nitrogen (MUN)). We studied 3149 dairy cows in 31 Hokkaido dairy farms in Japan. Five pathogen groups were studied: Streptococcus spp.; Staphylococcus aureus (S. aureus); coagulase-negative staphylococci (CNS); coliforms; and fungi. Test-day milk data and clinical records were collected from June 2011 until February 2014. Mixed models with an autoregressive correlation structure were fitted to quantify the effects of CM and several other control variables (herd, calving season, parity, week of lactation, and other diseases). Primipara (first lactation) and multipara (second and later lactations) were analysed separately. All pathogens, particularly S. aureus and fungi, were associated with significant milk losses in multipara. In this study, S. aureus and CNS infections were not associated with significant milk loss in primipara. All pathogens, in particular S. aureus and fungi, significantly increased SCC in both parity groups. All pathogens, especially CNS (in primipara) and S. aureus (in multipara), decreased lactose content. All pathogen groups except for fungi were associated with significant changes in fat, protein and MUN. Some pathogens such as Streptococcus spp. and coliforms seemed to be associated with long-term fat, protein and MUN changes. These findings provide estimates that could be used to calculate precise costs of CM, and also provide better indicators of pathogen-specific mastitis.

Keywords

Milk yieldmilk compositionSCCmastitispathogen
Type
Research Article
Information
Journal of Dairy Research , Volume 85 , Issue 3 , August 2018 , pp. 309 - 316
Copyright
Copyright © Hannah Dairy Research Foundation 2018 

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