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研究生:穆昭安
研究生(外文):Chao An-Mu
論文名稱:超音波與陰道電阻測定對改善乳牛繁殖之應用
論文名稱(外文):The application of ultrasonography and vaginal impedance measurement in improving fertility of dairy cows
指導教授:陳鵬文陳鵬文引用關係
學位類別:碩士
校院名稱:國立中興大學
系所名稱:獸醫學系
學門:獸醫學門
學類:獸醫學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:80
中文關鍵詞:超音波陰道電阻測定繁殖乳牛
外文關鍵詞:ultrasonographyvaginal impedance measurementfertilitydairy cows
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本實驗第一部分以超音波觀察乳牛卵巢濾泡動力學。由7頭動情週期正常的乳牛共觀察12個動情週期。結果顯示二波型較三波型的濾泡發育,其出現機率為高(75.0 % vs 25%),而動情週期時間平均為21.0 ±2.8天。第二部分實驗時間由88年6月至89年5月,觀測45頭牛隻於排卵前24小時之內(D -1,D 0=排卵日)排卵濾泡的變化,其排卵濾泡的大小與不排卵者之間並無顯著性差異,而在排卵前2天與前1天的生長速度,兩者間則有極顯著差異(P <0.01)。而45頭牛隻在人工授精後的結果,其回復發情率為13.3%(6/45),不回復發情比率為87.0%(39/45),而總懷孕率為60.0%(27/45)。其中,在高溫月份共有24頭經產牛隻進行人工授精,其回復發情率為4.2%(1/24),不回復發情率為95.8%(23/24),懷孕率為58.3%(14/24)。在牛隻早期妊娠診斷方面,於人工授精後21天至30天之間,以超音波(5.0 MHz)進行胎囊及黃體的妊娠診斷結果,在第21天回復發情的牛隻黃體大小為15.9 ±1.1 mm (n=6),而以第30天觀察胎囊的比率96.3%(26/27)為最高。評估觀測黃體的敏感性(sensitivity)、特異性(specificity)及懷孕的預測值(predictive value)等以第30天為最高,皆達到10 0.0%;而胎囊的也是在第30天最高,分別為96.3%, 100.0% 及100.0%。第三部分為分析88年921集集地震對於牛隻繁殖性能的結果,在地震前牛隻人工授精後回復發情率、不回復發情率及懷孕率分別為9.1%(1/11)、90.9 %(10/11)及54.5 %(11/11),與地震後由9/21~11/30日之間所觀察的結果,分別為71.4%(5/7)、28.6%(2/7)及14.3%(1/7)相比較,地震後一個月內牛隻的繁殖性能確實較地震前為低。第四部分為測量32頭發情期牛隻的陰道電阻,在測量排卵前陰道電阻值後進行人工授精,其總懷孕率較對照組的40頭牛懷孕率高(56.3 % vs 45.0%)。而陰道黏液電阻在排卵前一天越小(£ 79 W vs > 90 W),則人工授的精懷孕率越高(66.7 % vs 25.0%),但兩者之間不具顯著性的差異。
歸納本實驗結果對於在牧場牛隻繁殖的應用上有幾點結論:1.人工授精前以超音波監控排卵並在適當時間進行人工授精,可提升高溫環境下牛隻的受孕率。2.人工授精後在第30天是超音波觀測胎囊來判定牛隻懷孕的最佳時間。3.牛隻在發情期間測量陰道黏液導電度小於79Ω,再給予人工授精會提高受胎率。4.強烈地震會導致乳牛生理機能紊亂並影響繁殖性能。

第一章 緒言-------------------------------------------------1
第二章 文獻探討
第一節 母牛動情週期之濾泡動力學----------------------------3
第二節 母牛發情期荷爾蒙之變化及排卵機制--------------------6
第三節 高溫環境對於母牛繁殖性能之探討---------------------10
第四節 母牛早期妊娠觀察之超音波影像診斷學-----------------13
第五節 母牛陰道電子導電度與配種後懷孕率的關係--------------21
第三章 材料與方法
第一節 牛隻動情週期之超音波學的觀察------------------------25
第二節 超音波對母牛早期妊娠診斷之應用----------------------28
第三節 牛隻繁殖性能之探討----------------------------------30
第四節 陰道電子導電度分析對於改善母牛受胎率之研究----------31
第四章 結果
第一節 牛隻動情週期之超音波學的觀察------------------------34
第二節 超音波對母牛早期妊娠診斷之應用---------------------38
第三節 牛隻繁殖性能之探討---------------------------------47
第四節 陰道電子導電度分析對於改善母牛受胎率之研究----------53
第五章 討論------------------------------------------------57
參考文獻----------------------------------------------------72

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