Study of influence of primary and secondary pathogens on somatic cell count and milk quality in cows. [M.Sc. thesis] | Ispitivanje patogena prvog i drugog reda na broj somatskih celija i kvalitet mleka u krava. Magistarski rad
2008
Radinovic, M.
In cumulative milk samples, most frequently isolated primary pathogens were Staphylococcus aureus and Streptococcus agalactiae. These microorganisms brough to disarrange in udder secretion and incresing in somatic cell count. Bacteriological analyses of cumulative milk samples from four trial farms showed that finding of Staphylococcus aureus and Streptococcus agalactiae brought to increasing of somatic cell count in milk from infected cows. Udder infection and subclinical mastitis caused decreasing of milk production, so the average daily production in infected cows was lower that average on the farm. Cows with negative bacteriological findings in cumulative milk samples had average somatic cell count according to IDF standards and daily production was larger then average production on their farm. Research results showed that milk production is influenced by lactation stadium and milk quality is influenced by bacteriological findings from udder, which can be best seen in results from farm B, where average production was 19.3 kg of milk and the highest production was during the first phase of lactation (23.48 kg). In cows with Staphylococcus aureus, isolated from cumulative milk samples, somatic cell count was above standards and it depended from duration of infection and parenchym damages.
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