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KMID : 0359319950350030603
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Korean Journal of Veterinary Research
1995 Volume.35 No. 3 p.603 ~ p.613
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Progesterone assays as an aid for improving reproductive efficiency in dairy cattle
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김남기/Kim, Nam Ki
오기석/손창호/강병규/최한선/강현구/김삼주/Oh, Ki Seok/Son, Chang Ho/Kang, Byong Kyu/Choi, Han Sun/Kang, Hyun Ku/Kim, Sam Ju
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Abstract
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Plasma progesterone(P₄) assay has been introduced to apply to the differential diagnosis of reproductive disorders and the monitoring of responses of ovarian dysfunction to PGF₂α or GnRH treatment in the 204 postpartum and postinsemination subestrus dairy cows.
1. The incidence rate of reproductive disorders in 204 subestrus cows, diagnosed by palpation per rectum and plasma P₄ determination using ´Two sample test´(Day 0+Day 10) were as follows; silent heat or error of estrus detection 110(53.9%), persistent corpus luteum 26(12.7%), follicular cyst 16(7.8%), inactive ovary 12(5.9%), luteal cyst 11(5.4%), granulosa cell tumor of ovary 1(0.5%), fetal mummification 1(0.5%), endometritis 15(7.4%) and pyometra 12(5.9%), respectively.
2. After the PGF₂α treatment to the 76 cows with silent heat or error of estrus detection, persistent copus luteum, or luteal cyst, plasma P₄ concentrations at day 3 post treatment using ´Two sample test´(Day 0+Day 3) remained low(<1.0ng/㎖) in all 76 cows. Therefore all 76 cows responded positively to PGF₂α treatment. Seventeen cows with follicular cyst or inactive ovary were treated with GnRH. All 7 cows with follicular cyst and 4 cows with inactive ovary remained high(◎1.0ng/㎖) a plasma P₄ concentrations at day 12 post treatment using ´Two sample test´(Day 0+Day 12), but 6 cows with inactive ovary remained low(<1.0ng/㎖) a plasma P₄ concentrations. Therefore all 7 cows with follicular cyst and 4 cows with inactive ovary responded positively, but 6 cows with inactive ovary responded negatively to GnRH treatment.
3. The mean days from treatment to first service, number of cows conceived on first service(%), mean number of services per conception, mean days from initial treatment to conception, and mean number of cows conceived by 100 days post treatment(%) were 5.0 and 26.2 days, 45(59.2%) and 6(35.3%) cows, 1.5 and 1.7 services, 13.6 and 22.6 days, and 62(81.6%) and 9(52.9%) cows in group of PGF₂α and GnRH treatment, respectively.
These results indicated that plasma P₄ assay was practical as an aid to diagnosing reproductive disorders and to monitoring responses of ovarian dysfunction to PGF₂α and GnRH treatment in subestrus cows.
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KEYWORD
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