Sensitivity and specificity of a hand-held milk electrical conductivity meter compared to the California mastitis test for mastitis in dairy cattle

Trajkovska, Biljana and Kochoski, Ljupche and Karapetkovska-Hristova, Vesna and Makarijoski, Borche and Tomovska, Julijana (2015) Sensitivity and specificity of a hand-held milk electrical conductivity meter compared to the California mastitis test for mastitis in dairy cattle. Journal of Hygienic Engineering and Design, 11. pp. 3-8. ISSN 1857-8489

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Abstract Improving hygiene and the milk quality is a common interest of both its consumers and the farmers. The goal of this research was to determine the management practices which lead to improvement of the hygiene and the quality of the bulk tank milk in accordance with the current regulations. The subject of the research were Holstein Friesian cows, (N = 520), kept in tied up system and milked separately. The results obtained from 730 raw milk samples which were tested for their physical and chemical parameters using an infrared analyser Milcoscan, pH meter Metller Toledo and thermometer (proteins, milk fat, dry matter, pH, temperature) and their microbiological parameters (somatic cells (SCC) (Fossomatic 5000) and total bacteria count (TBC) (BactoScan) within a period of two years. A face to face survey was conducted with the farmer at the end of the first year, in reference with the milking procedure and the manner of the building and the milking equipment cleaning. The survey results were processed and some correctional measurements were applied with the purpose of improvement of the hygiene and the milk quality. The following results were reached during this research: the average number ofSCC on the farm during the first year was 304.17 x 103 cells/mL, and after the application of the correctional measurements that number diminished to 129.05 x 103 cells/mL. Also, a decrease was recorded in the average number of microorganisms which number from 163.84 x 103 cells/mL in the first year dropped to 56.29 x 103 cells/mL in the second year. No changes in the physical and chemical properties of the milk were registered. Management practices associated with low SCC included the use of teat disinfection post-milking, correct udder preparation and milking. At the farm level, the incorrect maintenance of the milking equipment and the insufficient level of hygiene in the building proved as a source of bacterial contamination. Key words: Management practices, SCC, TBC, Cow, Bulk tank milk.

Item Type: Article
Subjects: Scientific Fields (Frascati) > Agricultural Sciences > Animal and diary science
Divisions: Faculty of Biotechnical Sciences
Depositing User: Prof. d-r Ljupche Kochoski
Date Deposited: 29 Apr 2020 22:26
Last Modified: 29 Apr 2020 22:26

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