| Progesterone assays as an aid for improving reproductive efficiency in dairy cattle V. Plasma progesterone determination as applied to the differential diagnosis of reproductive disorders and judgement of treatment responses to PGF2α or GnRH tr |
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Byong-kyu Kang1, Han-sun Choi1, Chang-ho Son1, Ki-seok Oh1, Hyun-ku Kang1, Sam-ju Kim1, Hyek-jin Kim2, Nam-ki Kim3 |
1College of Veterinary Medicine, Chonnam National University
2Yudang Livestock Co. LTD.
3Guil Livestock Co. LTD. |
| Progesterone 농도측정(濃度測定)에 의한 유우(乳牛)의 번식효율증진(繁殖效率增進)에 관한 연구(硏究) V. 혈장(血漿) progesterone 농도측정(濃度測定)에 의한 무발정(無發情)의 감별진단(鑑別診斷) 및 PGF2α 또는 GnRH 치료효과(治療效果)의 판정(判定) |
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강병규1, 최한선1, 손창호1, 오기석1, 강현구1, 김삼주1, 김혁진2, 김남기3 |
1전남대학교 수의과대학
2(주)유당농산축산부
3(주)구일산업축산부 |
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| Abstract |
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Plasma progesterone($P_4$) assay has been introduced to apply to the differential diagnosis of reproductive disorders and the monitoring of responses of ovarian dysfunction to $PGF_2{alpha}$ 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 $P_4$ 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 $PGF_2{alpha}$ treatment to the 76 cows with silent heat or error of estrus detection, persistent corpus luteum, or luteal cyst, plasma $P_4$ concentrations at day 3 post treatment using 'Two sample test'(Day 0+Day 3) remained low(<1.0ng/ml) in all 76 cows. Therefore all 76 cows responded positively to $PGF_2{alpha}$ 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($${geq_-}1.0ng/ml$$) a plasma $P_4$ concentrations at day 12 post treatment using 'Two sample test'(Day 0+Day 12), but 6 cows with inactive ovary remained low(<1.0ng/ml) a plasma $P_4$ 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 $PGF_2{alpha}$ and GnRH treatment, respectively. These results indicated that plasma $P_4$ assay was practical as an aid to diagnosing reproductive disorders and to monitoring responses of ovarian dysfunction to $PGF_2{alpha}$ and GnRH treatment in subestrus cows. |
| Key Words:
progesterone, anestrus, $PGF_2{alpha}$, GnRH, dairy cow |
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