Study on the prevalence of subclinical mastitis in goat milk
AbstractThe study on the prevalence of subclinical mastitis in goat milk and comparison of different methods of determining the number of somatic cells in goat milk were carried out. The goat herds of German white, Anglo-Nubian, Alpine and local breeds, were studied twice to determine the subclinical mastitis: 83 dairy goats were examined in autumn, and 144 animals in spring. The first portions of milk were examined by mastoid test and the California mastitis test (CMT). Samples of milk were studied at the Laboratory of Food Hygiene at the Department of Parasitology, Veterinary and Sanitary Expertise at the Dnipro State Agrarian and Economic University. The settling test was conducted and the determination of somatic cell count in milk was carried out by viscosimetric method. We also made milk films and stained them by the May-Grunwald method. After that the number of somatic cells using microscope was calculated. As a result of bacteriological research of milk on pathogens, mastitis Staphylococcus aureus was isolated in autumn. In six months, the number of goats suffering from subclinical mastitis decreased from 12% to 8%, by improving the control of the udder health of farm animals. The mastoid test was better than the California mastitis test with goat milk, due to the formation of a tighter clot. From the milk samples which were positive or questionable on mastoid test, 29% samples were found consistent with the requirements of DSTU 7006:2009 for second-rate quality milk by viscosimetric method and settling test. Using the arbitration method (direct microscopy), it was found that the number of somatic cells did not meet the requirements of DSTU in all tests. The exact somatic cell count in goat milk should be determined only by direct microscopic or fluoroptoelectronic calculation. In samples that showed the largest somatic cell count in milk films (> 20 million/cm3), only 2 818 ± 956 ×103 cells/cm3 were determined by viscometric method, which proves the accuracy of the arbitration method. For continuous milk production and good-quality goods with a low number of somatic cells using viscometric method (< 600 thousand/cm3), it is recommended to continuously renovate the goat herd, since the lowest number of somatic cells in milk is observed in goats of the first lactation (firstborns).
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