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

The Veterinary Journal
Juliano Leonel GonçalvesMarcos Veiga dos Santos

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 d...Continue Reading

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Citations

Jun 22, 2019·Tropical Animal Health and Production·Cristian Marlon de Magalhães Rodrigues MartinsMarcos V Dos Santos
Oct 27, 2018·Frontiers in Veterinary Science·Pascal Rainard, Gilles Foucras
Aug 21, 2018·Journal of Dairy Science·A-M HeikkiläS Taponen
Mar 28, 2017·Journal of Dairy Science·Helio LangoniEduardo Nardini Gomes
Dec 2, 2020·Animals : an Open Access Journal From MDPI·Maros CobirkaPetr Slama
Mar 13, 2021·Frontiers in Microbiology·Davide PorcellatoSiv B Skeie
Jun 3, 2021·Foods·Klára PodhoreckáOndřej Elich
Sep 10, 2021·Frontiers in Veterinary Science·Carsten KirkebyKaare Græsbøll

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