Studies upon resistance factors in the mammary gland of the cow. II. Lysozyme (muramidase) in cows' milk from udders experimentally infected with Streptococcus agalactiae
Janota Bassalik, L.; Piotrowska, E.; Zajac, M.; Wojtaszkiewicz, M.
Prace i Materialy Zootechniczne 1975(8): 125-134
3 ml of suspensions of Str. agalactiae in milk (3 X 104 colony-forming units/ml) were infused 2 h after milking into 2 quarters of each of 4 Polish Black-and-White Lowland cows at the start of 1st lactation. Udders and milk were then examined for 2 months. Differences in response between cows were more marked than those between individual quarters of the same cow.