Prevalence and risk factors of subclinical mastitis in lactating dairy cows in north and south regions of Bangladesh

Abstract

The purpose of the study was to identify the potential risk factors for subclinical mastitis (SCM) in lactating dairy cows in Bangladesh. A cross-sectional study was carried out on randomly selected 212 smallholder dairy farms of Sadar upazilas of Rangpur, Mymensingh, and Satkhira districts of Bangladesh during January to October 2011. The direct interview using a structured questionnaire and physical examination of the cows were done to collect data on 15 variables. Milk samples collected from study cows were subjected to California Mastitis Test (CMT). The diagnosis of SCM was based on the results of CMT and physical examination of udder and milk. The bivariable followed by multivariable analysis was done using SPSS 17.0. Of the total cows examined, 20.2 % had subclinical mastitis. In bivariable analysis, eight risk factors were identified. However, in the final model of multivariable analysis, four potential risk factors were identified. These were history of previous clinical mastitis (odds ratio (OR) 10.51, p<0.001), pendulous type of udder (OR 2.26, p=0.008), no grass feeding (OR 1.84, p=0.039), and body condition score (BCS) 2.5 or less (OR 7.25, p=0.054). Four different factors were significantly associated with the occurrence of subclinical mastitis, which need to be considered in the control of the disease. However, particular emphasis should be given on grass feeding and BCS because these traits can be modified or improved to allow prevention of SCM.

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

“…However, less prevalence was reported as 29.5% (Islam et al, 2011) and 20.2 % (Sarker et al, 2013) in Bangladesh for SCM. The pooled estimates of CM prevalence were 27%, which was less when compared to the SCM, indicating the importance of SCM in India.…”

Prevalence of Subclinical Mastitis in Lactating Cows and Efficacy of Intramammary Infusion Therapy

“…The subclinical mastitis (SCM) is more serious and is responsible for much greater loss to the dairy industry in Bangladesh (Kader et al, 2003). Subclinical mastitis is 15 to 40 times more prevalent than the clinical form, is of long duration and difficult to detect ( (Almaw et al, 2008;George et al, 2008;Sarker et al, 2013). In Bangladesh, the prevalence of SCM is recorded from 20 to 44% at cow level based on California Mastitis Test (CMT) (Rahman et al, 2009;Islam et al, 2010;Rabbani and Samad, 2010).…”

“…But there are not properly known by dairy farmers to infuse of intramammary antibiotics in SCM affected lactating cows. However, the reports on the efficacy of intramammary infusion in lactating cows are very limited (Siddiquee et al, 2013) Sarker et al, 2013). Therefore, the objectives of this study were to estimate the prevalence of subclinical mastitis in lactating cows using (CMT) and to evaluate the efficacy of intramammary infusion against SCM in lactating dairy cows.…”

Bovine Mastitis and Its Therapeutic Strategy Doing Antibiotic Sensitivity Test

“…Moreover, cow's parity has significant influence of on prevalence of mastitis in farms. Cows in parity number more than 3 have considerably higher mastitis prevalence than those of parity 2-3 and primiparous one [64]. Primiparous cows have stronger defense mechanism than multiparous cows that make them less susceptible to mastitis.…”

“…Herd management and milk hygiene are also considered significant risk factors for mastitis [64,75]. The occurrence of bovine mastitis is remarkably higher in less clean udder in contrast to clean one.…”