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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effects of bovine subclinical mastitis caused by Corynebacterium spp. on somatic cell count, milk yield and composition by comparing contralateral quarters

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Author(s):
Goncalves, Juliano Leonel [1] ; Tomazi, Tiago [1] ; Barreiro, Juliana Regina [1] ; Beuron, Daniele Cristine [1] ; Arcari, Marcos Andre [1] ; In Lee, Sarah Hwa [2] ; de Magalhaes Rodrigues Martins, Cristian Marlon [1] ; Araujo Junior, Joao Pessoa [3] ; dos Santos, Marcos Veiga [1]
Total Authors: 9
Affiliation:
[1] Univ Sao Paulo, Sch Vet Med & Anim Sci, Dept Anim Sci, Pirassununga, SP - Brazil
[2] Univ Sao Paulo, Sch Anim Sci & Food Engn, Dept Food Engn, Pirassununga, SP - Brazil
[3] State Univ Sao Paulo Julio de Mesquita UNESP, Inst Biosci, Botucatu, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: VETERINARY JOURNAL; v. 209, p. 87-92, MAR 2016.
Web of Science Citations: 14
Abstract

Subclinical mastitis caused by Corynebacterium spp. (as a group and at the species level) was investigated by evaluating contralateral (healthy and infected) mammary quarters for somatic cell count (SCC), milk yield and composition. Selection of cows with subclinical mastitis caused by Corynebacterium spp. was performed by microbiological culture of composite samples collected from 1242 dairy cows from 21 dairy herds. For each of the selected cows, milk yield was measured and milk samples were collected at the mammary quarter level (i.e., 1140 mammary samples collected from 285 cows) for analysis of milk composition and SCC. The identification of Corynebacterium spp. isolates was performed by 16S rRNA gene sequencing. One hundred and eighty Corynebacterium spp. isolates were identified, of which 167 (92.77%) were C. bovis and eight (4.44%) non-C. bovis; for five of the Corynebacterium spp. isolates (2.77%), sequencing of 16S rRNA genes did not allow identification at the species level. Mammary quarters infected with Corynebacterium spp. as a group had a higher geometric mean SCC (197,900 cells/mL) than healthy contralateral mammary quarters (85,800 cells/mL). Species of Corynebacterium non-C bovis were infrequently isolated and did not change SCC, milk yield or milk solid contents when evaluated at the contralateral quarter level. Although C. bovis infection showed no effect on milk yield, fat, protein, casein or total solids in milk, it increased SCC and decreased lactose and milk solids non-fat content. (C) 2016 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 11/14284-5 - Milk yield and composition in cows with mastitis caused by minor pathogens
Grantee:Marcos Veiga dos Santos
Support Opportunities: Regular Research Grants