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Mycobacterium avium subsp. paratuberculosis (MAP) is the causative agent of Johne’s disease in dairy cattle populations around the world. The objective of this study was to evaluate MAP antibody kinetics in serum and milk samples throughout the lactation period in dairy cattle. The samples were collected simultaneously from eight MAP-positive and two healthy MAP-negative (control group) cows. The MAP antibody was detected by using serum and milk ELISA. The serum and milk MAP antibody titers fluctuated between the positive and negative cut-off values in this study. Specifically, cattle with low MAP antibody titer (<100) showed fluctuation between the cut-off values. Variable changes of MAP antibody titer were also observed after parturition. Between the serum and milk MAP antibody titers, there was a positive correlation (R2 = 0.5358) observed throughout the assessment period. The milk MAP ELISA test had low diagnostic performance in cows with low MAP titer due to its weak correlation (R2 = 0.0198). Finally, this study suggest that the periodic MAP ELISA test is recommended for the application of Johne’s eradication program due to the fluctuating nature of MAP antibody kinetics.

T he majority of Bangladesh's population is, directly and indirectly, reliant on agricultural activity. Agriculture is one of the main economic sectors, accounting for 13.31% of GDP. The involvement of agricultural workers in the labor force as a whole is 43% (BBS, 2019). The population of cattle in Bangladesh is now 243.91 lakh in number and the contribution of Livestock to the Gross Domestic Product (GDP) is 1.47% (DLS, 2021). One of the main obstacles to the production of cattle may be gastrointestinal (GI) parasite diseases ( Jittapalapong et al., 2011). A condition known as gastrointestinal (GI) parasitic infestation is brought on by a variety of genera of parasites that live in the gastrointestinal tracts of cattle. Due to subclinical or chronic infections that produce economic losses, the infection decreases productivity through decreased feed intake, decreased efficiency, and infeed utilization (Stromberg et al., 2012;Deo et al, 2019). Mainly, helminth, protozoa, cestode, and trematode are what induce GI parasitism in cattle (Pinilla et al., 2019). The protozoan Eimeria spp., which parasitizes ruminants, equines, and rabbits and causes bovine coccidiosis, is a member of the phylum Apicomplexa (Shaikh et al., 2022). Cattle and

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