Frequency of excretion of group B streptococci (Streptococcus agalactiae) in the milk during subclinical forms of mammary gland diseases in cows
Kubín, V.; Franĕk, J.
Veterinarni Medicina 29(3): 129-132
1984
ISSN/ISBN: 0375-8427 PMID: 6426124 Document Number: 221317
The milk excretion of group B streptococci (Streptococcus agalactiae) from the udder quarters was examined in thirty cows of a heavily infected herd. Six samplings were performed in ten- to fourteen-day intervals. With respect to excretion rate, the set of cows could be divided into three groups: 1. group of cows excreting S. agalactiae from all udder quarters permanently and absolutely regularly; 2. cows excreting S. agalactiae regularly only from some quarters, certain quarter being negative at all samplings; 3. cows excreting streptococci from all quarters absolutely irregularly, without any conclusive order or dependence. The cytological picture of all samples exhibited no signs of inflammation. The discussion deals with some factors that may influence the excretion of streptococci with milk.