Electrical conductivity and total dissolved solid of raw milk for the detection of bovine subclinical mastitis

Vet World Vol.16 December-2023 Article-18

Research Article

Veterinary World, 16(12): 2521-2525

https://doi.org/10.14202/vetworld.2023.2521-2525

Tasnia Tabassum Anika¹, Zakaria Al Noman², A. K. M. Anisur Rahman, Nazneen Sultana¹, Mohammad Nahid Ashraf³, Munmun Pervin¹, M. Ariful Islam⁴, Md. Mokbul Hossain¹, and Mohammad Abu Hadi Noor Ali Khan¹

1. Department of Pathology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh.
2. Bangladesh Council of Scientific and Industrial Research, Dhaka, 1205, Bangladesh.
3. Department of Microbiology and Hygiene, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh.
4. Department of Medicine, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh.

Background and Aim: Bovine subclinical mastitis (SCM) is highly prevalent among dairy cattle. A cross-sectional study was conducted in Bangladesh to evaluate the performance of electric conductivity (EC) and total dissolved solids (TDS) tests for the detection of SCM.

Materials and Methods: We randomly selected 108 milk samples from cows of different breeds in the primary milk-producing region of Pabna and Sirajgonj districts of Bangladesh. Samples were subjected to the California mastitis test (CMT), white side test (WST), electric conductivity (EC), TDS, and culture. A cow was considered positive for SCM if it tested positive in CMT, WST, and culture, whereas a cow was considered negative for SCM if it tested negative in all three methods. These gold standards have been used to evaluate the performance of the EC and TDS tests. The optimal EC and TDS cutoff values for the detection of SCM were determined using the “optimal cutoff” function in R version 4.3.1.

Results: The optimal EC cutoff value for SCM detection was found to be 6159 μS/cm or 6.16 mS/cm. A positive likelihood ratio (LR+) of 31.2 and an area under the curve (AUC) of 0.905 were obtained for this cutoff value. The optimal cutoff value for TDS was 3100 mg/L of milk, which resulted in a positive LR+ of 45.5 and an AUC of 0.924.

Conclusion: To the best of our knowledge, this is the first study to evaluate the performance of EC and TDS tests in detecting SCM in Bangladesh. These results suggest that EC and TDS tests, which are inexpensive, rapid, and easy to conduct, can effectively detect SCM at the farm level. Keywords: Bangladesh, cutoff value, electric conductivity, subclinical mastitis, total dissolved solid.

Keywords: Bangladesh, cutoff value, electric conductivity, subclinical mastitis, total dissolved solid.

How to cite this article: Anika TT, Al-Noman Z, Rahman AKMA, Sultana N, Ashraf MN, Pervin M, Islam MA, Hossain MM, and Khan MAHNA (2023) Electrical conductivity and total dissolved solid of raw milk for the detection of bovine subclinical mastitis, Veterinary World, 16(12): 2521-2525.

Received: 23-07-2023 Accepted: 22-11-2023 Published online: 28-12-2023

Corresponding author: Mohammad Abu Hadi Noor Ali Khan E-mail: hadi.khan@bau.edu.bd

DOI: 10.14202/vetworld.2023.2521-2525

Copyright: Anika, et al. This article is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http:// creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.