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Studies on staphylococci isolated from bovine mastitis, 3; activity of penicillins and gentamicin to isolates
1984
Park, C.K. (Kyongbuk National Univ., Taegu (Korea R.). Dept. of Veterinary Medicine)
The in vitro activity of penicillins (penicillin G, ampicillin, carbenicillin, methicillin and cloxacillin) and gentamicin to Staphylococcus aureus and coagulase-negative staphylococci isolated from bovine mastitic milk samples was determined. The growth of all isolates of staphylococci tested was inhibited by cloxacillin and methicillin at concentration of 0.78 micro g/ml and by gentamicin at a minimum inhibitory concentration (MIC) of 1.56 micro g/ml
Afficher plus [+] Moins [-]Studies on pregnancy of dairy cows based on hormone concentrations in blood serum and milk
1984
Kim, S.K. (Chungnam National Univ., Taejon (Korea R.). Dept. of Veterinary Medicine)
The study was to find out the changes of hormone levels in blood serum and milk of Holstein cows during the estrous cycle. The progesterone, estradio 1-17beta from the blood serum and milk samples were assayed by radioimmunoassay methods. During 20 to 25 days after artificial insemination, the accuracy of pregnancy diagnosis from the blood serum progesterone levels were 87.5% for non pregnant cows (2.Ong/ml) and 83.3% for pregnant cows (3.Ong/ml). The accuracy of pregnancy diagnosis from the milk progesterone levels were 75.0% for non-pregnant cows (2.4ng/ml), and 94.4% for pregnant cows (3.2ng/ml)
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