A Study on the Bacteria Causing Subclinical Mastitis in Dairy Cows and its Effect on Somatic Cell Count and Milk Chemical Composition parameters | ||
| Zagazig Veterinary Journal | ||
| Article 3, Volume 43, Issue 1, March 2015, Pages 26-35 PDF (709.31 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/zvjz.2015.29341 | ||
| Authors | ||
| S M El-Sayed1; I E Awad1; Mira EK I2; S MIA Shalapy2 | ||
| 1Food Control Department, Faculty of vet. Med., Zagazig University, Egypt | ||
| 2Food Hygiene Department, Animal Health Research Institute, Dokki-Cairo | ||
| Abstract | ||
| The Present study was designed to investigate the prevalence of Subclinical mastitis. A total number of one hundred and sixty (160) cow's quarter milk samples were collected from different dairy farms at Sharkia Governorate for detection of the causative agents of Subclinical mastitis. The results revealed that California mastitis test (CMT) was graded as (- , ± , + , ++ , +++ ) with incidence of ( 12.5 , 6.25 , 34.375 , 25.526 , and 21.25 % ) respectively, the mean ± SEM of milk electrical conductivity ( EC ) ( ms / cm ) of 6.5 ± 2.5 , and the mean ± SEM of milk Somatic cell count ( SCC) ( cells / ml ) was 547.5 × 103 ± 507.5 × 103 , the mean ± SEM of milk Chloride % was 0.235 % ± 0.165 % , the mean ± SEM of measured Fat % was 2.65 % ± 1.15 % , the mean ± SEM of measured Protein % was 3.1 % ± 1.1 % , the mean ± SEM of measured Lactose % was 3.55 % ± 1.45 % , the mean ± SEM of measured SNF % was 7.5 % ± 1.5 % . The most predominant single pathogens in 100 out of 160 milk samples was S . aureus, S.agalactiae, S.dysagalactiae, S.uberis and E.coli with incidence of (21.875, 15.625, 12.5 , 6.25 and 6.25 % ) respectively, and normal healthy control 20 ( 12.5 % ) milk samples (didn't yield any pathogens), and 40 ( 25 %) milk samples yield mixed bacterial pathogens . It can be concluded that CMT was used to determine the severity of Subclinical mastitis. CMT positive and SCC>250.000 (cells / ml ) in individual quarter foremilk samples was found to be accompanied by several production effects and sever depression in milk chemical parameters. Bacterial contamination of milk from affected cows render it unfit for human consumption, and there is correlation between SCC and decrease chemical milk parameters. | ||
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