Bovine subclinical intramammary infection caused by coagulase-negative staphylococci increases somatic cell count but has no effect on milk yield or composition

Journal of Dairy Science
Tiago TomaziMarcos Veiga dos Santos

Abstract

The aim of this study was to evaluate the effect of subclinical intramammary infection (IMI) caused by coagulase-negative staphylococci (CNS) as a group and by specific CNS species on milk yield and composition and somatic cell count (SCC) of dairy cows. Selection of cows with IMI caused by CNS was performed by microbiological cultures of composite samples collected from 1,242 dairy cows distributed in 21 dairy herds. After selection of cows, milk yield was measured and milk samples were collected at the mammary quarter level (i.e., 1,140 mammary samples collected from 285 cows) for analysis of milk composition and SCC. In total, 108 isolates of CNS were identified at the species level by PCR-RFLP analysis. Forty-one pairs of contralateral mammary quarters, with and without IMI, were used to evaluate the effect of CNS on milk yield and composition. Mammary quarters infected with CNS had higher geometric mean SCC (306,106 cells/mL) than noninfected contralateral mammary quarters (62,807 cells/mL). Intramammary infection caused by CNS had no effect on milk yield or on contents of fat, crude protein, casein, lactose, total solids, and solids-not-fat. Staphylococcus chromogenes was the most prevalent CNS species in this study and t...Continue Reading

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Citations

Oct 18, 2015·Journal of Dairy Science·T TomaziM V Dos Santos
Jun 28, 2017·The Journal of Dairy Research·Juliano Leonel GonçalvesKevin L Anderson
Nov 28, 2017·Journal of Dairy Science·A-K NymanK Persson Waller
Jul 27, 2018·The Veterinary Record·Athanasios I GelasakisGeorgios Arsenos
Feb 23, 2018·The Journal of Dairy Research·Sotiria VourakiGeorgios Arsenos
Jun 22, 2019·Tropical Animal Health and Production·Cristian Marlon de Magalhães Rodrigues MartinsMarcos V Dos Santos
May 22, 2017·Journal of Dairy Science·Larissa A Z CondasHerman W Barkema
Aug 21, 2018·Journal of Dairy Science·A-M HeikkiläS Taponen
Aug 28, 2018·Journal of Dairy Science·R F LeiteM V Santos
May 4, 2021·Frontiers in Veterinary Science·Jeroen De BuckHerman W Barkema

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