Affiner votre recherche
Résultats 1-2 de 2
Immunoglobulins and lactoferrin concentration in milk and bacteria causing subclinical mastitis in dairy cows
2005
Kocina, I.(Latvia Univ. of Agriculture, Jelgava (Latvia))E-mail:iveta.kocina@pvd.gov.lv | Antane, V.(Latvia Univ. of Agriculture, Jelgava (Latvia)) | Lusis, I.(Latvia Univ. of Agriculture, Jelgava (Latvia))
Natural defence mechanisms of the mammary gland tissues play a vital role in protecting the gland from infections. The progress of mammary infection depends on the ability of bacterial pathogens to adapt to milk and udder tissues, and on the various virulence factors they activate, as well as on the cow's response. The levels of immunoglobulins (lg) and lactoferrin (Lf) concentration in the milk from dairy cows with and without subclinical mastitis were determined. In this investigation it was stated that 82.5% of samples were negative, but 17.5% of samples were positive for pathogens. Cows had subclinical mastitis caused by Coagulase negative staphylococci observed in 48.60%, Streptococcus uberis - 32.10%, Staphylococcus aureus - 18.90% of cases in milk samples. There were no significant differences between all classes of immunoglobulins concentration in the milk without pathogens and with pathogens. The lactoferrin concentration was significantly increased for 40.33% in the milk with pathogens.
Afficher plus [+] Moins [-]Evaluation of microflora and somatic cell count changes in mastitic udder secretion
2002
Konosonoka, I.H. (Latvia Univ. of Agriculture, Sigulda (Latvia). Research Centre "Sigra")
Udder secretion samples from mastitic and healthy udders were examined at the Department of Veterinary Medicine of the LUA Research Centre "Sigra". In total, 117 samples from 117 cows were investigated. Somatic cell count was recorded for cows with clinical and subclinical infections, and uninfected cows. The mean somatic cell counts for cows with clinical and subclinical mastitis were 1 825 250+-417 697 cells ml*[-1) and 967 866+-75 796 cells ml*[-1), respectively. For healthy cows the mean somatic cell count was 87 666+-15 384 cells ml*[-1). Gram-positive microorganisms from the genera Micrococcus, Staphylococcus, Streptococcus, and Corynebacterium, and gram-negative microorganisms from the genera Enterobacter, Klebsiella, Salmonella, Escheria and Pseudomonas were isolated from samples from mastitic quarters.
Afficher plus [+] Moins [-]