A systematic review and meta-analysis of prevalence of subclinical mastitis in dairy cows in India

Abstract

The purpose of the study was to provide the pooled estimate of the prevalence of subclinical mastitis among dairy cows in India and to examine the consistency of those estimates between published studies. We have conducted a systematic review of prevalence of subclinical mastitis in dairy cows for the period 1995-2014 using electronic and non-electronic databases. Meta-analysis of 28 studies was done under random effects model using Metaprop package in R software. The pooled estimate of prevalence of subclinical mastitis on cow-basis was obtained using 6344 cows from 25 studies and was found to be 46.35 % (95 % CI 39.38; 53.46). Meta-analysis for quarter-wise prevalence of subclinical mastitis was carried out using 18,721 udder quarters of dairy cows from 23 studies, and the pooled estimate of prevalence of subclinical mastitis on quarter-basis was found to be 23.25 % (95 % CI 18.15; 29.27). Meta-analysis showed that there is statistically high heterogeneity for the prevalence estimates between published studies. The present study reported that there is high prevalence of subclinical mastitis in dairy cows in India, which might be responsible for low productivity in lactating cows in India over the years and needs to be controlled by adopting scientific, managemental, and therapeutic measures. Dairy farmers can reduce incidence and economic losses due to subclinical mastitis under the guidance of field veterinarians.

Bovine mastitis prevalence and associated risk factors in dairy cows in Nyagatare District, Rwanda

“…The prevalence of mastitis found in this study is lower than that in the studies of Janzekovic et al ( 2009 ) in Slovenia, Muhammad et al ( 2011 ) in Pakistan, and Siddiquee et al ( 2013 ) in Bangladesh, all of which used the Draminski ® test and reported prevalence values of 80%, 65.2% and 55.1% respectively. However, prevalence of mastitis in this study was higher than that reported in other studies that used the Draminski ® test: Hassan, Samarasinghe and Lopez-Benavides ( 2007 ) reported a prevalence rate of 39% in New Zealand, and Yogesh et al ( 2014 ) reported a prevalence of 46.4% in India.…”

Meta-analysis of Prevalence of Subclinical and Clinical Mastitis, Major Mastitis Pathogens in Dairy Cattle in India

“…In the present study, prevalence of subclinical mastitis at cow level was 41% and was slightly less when compared to previous meta-analysis study on subclinical mastitis was 46.35% in cows (Bangar et al, 2015). However, the past study reported the prevalence of subclinical mastitis ranges from 15 to 75 % (Cynthia, 2005) and concurred with the present study.…”

“…The prevalence of mastitis in dairy animals was found to be variable from study to study due to the variations in the period and location of study, breed of animal, stage of lactation, number of samples tested, sampling strategies and management practices of the dairy farms. Previous literature has reported the metaanalysis of prevalence of subclinical mastitis in dairy cows for the period 1995-2014 (Bangar et al, 2015), however, the metaanalysis of prevalence of clinical mastitis and major mastitis pathogens were not reported so far. Among the bacteria isolated in bovine mastitis, Staphylococcus species occupies an important place.…”

Characterization of Escherichia coli Isolated from Bovine Subclinical Mastitis for Virulence Genes, Phylogenetic Groups and ESBL Production

“…(Hiitiö et al, 2017) including reports from India (Sharma et al, 2012). Meta-analysis of subclinical mastitis in cows revealed prevalence of SCM in India to the tune of 46.35% on cow basis (Bangar et al, 2015). In this study, 45% animals were positive for subclinical mastitis, which is very high for the farmers rearing small numbers of animals.…”