Abstract
The subclinical mastitis is more serious and is responsible for much greater loss to the dairy industry in Bangladesh. This study was performed to determine the prevalence of subclinical mastitis and identify the associated risk factors in randomly selected 200 lactating buffaloes (192 local and 8 crossbred) at some selected regions of Bhola district, Bangladesh during the period from March 2018 to February 2019. California Mastitis Test (CMT) was performed on each quarter milk sample of lactating buffaloes at field condition for the determination of subclinical mastitis in dairy buffaloes. Overall prevalence of subclinical mastitis was 10.50% (21/200). The prevalence of subclinical mastitis (SCM) was comparatively higher in crossbred (12.5%) as compared to local breed (10.42%). The highest prevalence of SCM in dairy buffaloes was also found in late lactation period (12.82%), age group 7 to 18 years (13.46%), rainy season (11.1%) and 2nd parity group (10.74%). Moreover, the buffaloes graze in free range areas; large and medium sized farms; poor health conditions and other diseases of post parturient period increasing the susceptibility of SCM. For early diagnosis of subclinical mastitis, CMT can be performed regularly as a control measures and emphasis should be provided on farm management practices; particularly on milking hygiene and udder sanitation.
 Asian J. Med. Biol. Res. December 2020, 6(4): 697-704
Highlights
Bangladesh is a densely populated agro based developing country where livestock plays a crucial role in the national economy
Among the 21 positive cases from 200 dairy buffaloes, subclinical mastitis (SCM) was recorded as 7(7.29%) and 14(13.46%) in the age group of 3 to 6 years and 7 to 1 8 years, respectively shown in Table 1.The parity wise prevalence of SCM was recorded as 10.13% and 10.74 % during the parity numbers 1 and 2, respectively
The present study showed that the prevalence of subclinical mastitis in dairy buffaloes as 5.88 %, 10.42 % and 12.82 % in early, mid and late lactation, respectively
Summary
Bangladesh is a densely populated agro based developing country where livestock plays a crucial role in the national economy. Annual milk production in Bangladesh is 9.4 million metric tons and about 95% milk comes from cattle (DLS, 2017-18). The produced milk can fulfill only 13.6% of the total requirement in Bangladesh. Yeast and fungus have been found frequently infecting the udder (Andrews et al, 1985). It has many negative economic impacts on dairy farms in terms of abnormal milk, reduced production, deterioration of milk quality and treatment cost (Seegers et al, 2003). The disease causes huge economic loss to the dairy industry and the annual economic losses due to mastitis have been estimated to be Tk.122.6 (US$ 2.11) Million
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