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Studies on the diagnosis of subclinical mastitis in cows by the measurement of the electrical conductivity, 1; comparison of various methods of handling conductivity data with the use of California mastitis test and direct somatic cell count
1984
Kang, B.K. (Chonnam National Univ., Kwangju (Korea R.). Coll. of Agriculture. Dept. of Veterinary Medicine)
A total of 466 foremilk from dairy farms in Chonnam Korea [R.] district was examined for the subclinical mastitis over a period of 1 year, using a method of the electrical conductivities (EC); absolute conductivity (AC) and differential conductivity (DC) and quarter difference value (QD), in relation to the California mastitis test (CMT) and the direst somatic cell count (DSCC). The compatibility and efficiency rating between the EC values and the other screening tests was conducted
Show more [+] Less [-]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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