Activity of selected glycosidases of whole milk in cows as related to feeding season (autumn/winter vs spring/summer)

摘要

Glycosidases affect the chemical composition and nutritive value of milk. The activities of alpha-glucosidase, beta-glucosidase, beta-galactosidase and mannosidase were determined in whole milk of Polish Red cows (with mean milk yield 4200 kg/lactation) at the end of autumn/winter (AAV) and then at the end of spring/summer (S/S) feeding season - 23 and 19 cows, respectively. Feeding was characteristic of seasons: silages, hay and concentrates during A/W or grazing and concentrates during S/S, Activities of all glycosidases were found significantly higher in milk of cows at the end of S/S than at the end of A/W season,