A large multi-centric study in the United States assessing self-cure rates in dairy cows during the dry period from mastitis due to Staphylococcus aureus

Lloyd Reeve-Johnson; S C Nickerson

doi:10.15761/AHDVS.1000108

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A large multi-centric study in the United States assessing self-cure rates in dairy cows during the dry period from mastitis due to Staphylococcus aureus

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A large multi-centric study in the United States assessing self-cure rates in dairy cows during the dry period from mastitis due to Staphylococcus aureus

Lloyd Reeve-Johnson and S C Nickerson

Animal Husbandry, Dairy and Veterinary Science, Vol.1(2), pp.1-7

2017

DOI: https://doi.org/10.15761/AHDVS.1000108

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Abstract

Veterinary Sciences

Animal Production

dry period

mastitis

self-cure

Staphylococcus aureus

In a multicentric study, several factors were demonstrated to be linked to the ability of dairy cows to spontaneously or self cure (without dry cow therapy) over the nonlactating period from natural intramammary infections (IMI) caused by Staphylococcus aureus. Self-cure was found to be twice as likely in primiparous cows compared to multiparous cows. It was also found that primiparous cows with quarter cell counts < 1.25 × 106 /ml had a self cure probability four times greater than either primiparous or multiparous cows with higher cell counts. No cows with 3 or 4 quarters infected were found to self-cure, while 7-8% of those with 1 or 2 quarters infected were found to self-cure. Short dry periods were associated with a higher probability of self-cure. Farms which segregated cows into sub-herds of S. aureus infected and non-infected cows reduced the probability of a self-cure in the infected groups five-fold for multiparous cows compared to those where cows remained in the herd. A predictive model developed for the likelihood of self cure based upon the quarter somatic cell count (QSCC) showed that the probability of self-cure decreased by approximately 2% per additional 100,000 cells/ml from 100,000-500,000 cells/ml then a further 2% per 500,000 cells up to 1,500 000 cells/ml. This tool could be useful as an aid in the prioritization of treatment or culling decisions.

Details

Title: A large multi-centric study in the United States assessing self-cure rates in dairy cows during the dry period from mastitis due to Staphylococcus aureus
Authors: Lloyd Reeve-Johnson (Author) - University of Queensland
S C Nickerson (Author) - University of Georgia, United States
Publication details: Animal Husbandry, Dairy and Veterinary Science, Vol.1(2), pp.1-7
Publisher: Open Access Text (OAT)
Date published: 2017
DOI: 10.15761/AHDVS.1000108
ISSN: 2513-9304
Copyright note: Copyright © 2017 Reeve-Johnson L. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Organisation Unit: Faculty of Science, Health, Education and Engineering; University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99450747802621
Output Type: Journal article

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