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題名 | Use of GnRH-PGF-GnRH as a Method of Timed Insemination to Improve Fertility in Lactating Holstein Cows in Southern Taiwan=利用GnRH-PGF-GnRH定時配種法改善臺灣南部泌乳牛之受胎率研究 |
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作者 | 李善男; Lee, Shan-nan; |
期刊 | 中國畜牧學會會誌 |
出版日期 | 19990900 |
卷期 | 28:3 1999.09[民88.09] |
頁次 | 頁373-380 |
分類號 | 437.3 |
語文 | eng |
關鍵詞 | 激性腺釋素; 前列腺素; 定時配種; 受胎率; 荷蘭乳牛; PGF[feaf]扵; GnRF; Timed insemination; Pregnancy rates; Holstein cows; |
中文摘要 | 本試驗旨在比較產後之泌乳牛以GnRH-PGF-GnRH注射之排卵同期化法(試驗組)和 以傳統發情觀察法(對照組),經配種後受胎率之差異。結果顯示:1.乳牛第一次配種之受胎 率,試驗組在產後≦75日,76~120日及≧121日之受胎率均分別較對照組高(55.2 vs. 39.1%; 52.3 vs. 34.5%及43.9 vs. 27.3%)。2.第二次、三次及四次以上配種之受胎率,試驗組及 對照組分別為52.1 vs. 39.0%; 65.4 vs. 39.2%及74.2 vs. 45.3%。3.以季節別分析時,於 冬春夏秋之受胎率,試驗組及對照組分別為61.3 vs. 43.3%; 66.4 vs. 42.6%; 25.0 vs. 15.0% 及20.0 vs. 26.9%。4.若以第一次配種受胎率計算產後75日以內之每次懷孕所需費用,最 低為652元最高為1902元;76~120日為688及2008元;121日以上則為820及2392元。綜合 之資料說明:利用GnRH同期排卵法配種,對乳牛產後受胎率之提昇有顯著之效果,有利於管 理作業;然於不同季節應用時,以冬春兩季之效果較佳。定時配種在泌乳中期似可做為亞熱帶 地區有效的繁殖管理方法。 |
英文摘要 | The objective of this study was to determine the effect of a timed insemination (GnRH-PGF-GnRH, Ovsynch protocol) and artificial insemination (Al) at observed estrus and to evaluate its cost per pregnancy in Taiwan. Cows treated with the Ovsynch protocol were administered with 100 μg of GnRH i.m. Seven days later, cows received 25 mg of PGF2α and received a second injection of 100 μg of GnRH 48 h later and timed AI 16 to 18 h later. Cows in the control group were observed for estrus for AI. Pregnancy rates after first service at different stage of lactation: ≦75 d, 76-120 d and ≧121 d postpartum on the Ovsynch versus observed estrus were 55.2 vs. 39.1%, P=0.051; 52.3 vs. 34.5%. P=0.024 and 43.9 vs. 27.3%, P=0.318, respectively. Pregnancy rates after 2nd, 3rd and ≧4th services in the repeated-breeders were 52.1 vs. 39.0%, P=0.013; 65.4 vs. 39.2%, P=0.017 and 74.2 vs. 45.3%. P=0.005, respectively. Pregnancy rates in association with seasonal effect (winter, spring, summer and autumn) when cows were first serviced postpartum at Ovsynch versus observed estrus were 61.3 vs. 43.3%, P=0.047; 66.4 vs. 42.6%, P=0.005; 25.0 vs. 15.0%, P=0.429 and 20.0 vs. 26.9%. P=0.525, respectively. The range of the estimated cost, the least and the highest, per pregnancy for the first service at different stage of lactation using Ovsynch protocol were NT$ 652~1902; 688~2008 and 820~2393, respectively. Results indicated that timed AI using Ovsynch protocol at mid lactation was an effective and economic alternative for reproductive management in lactating cows in a subtropical environment. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。