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題名 | 誘發不孕乳牛泌乳之研究1:性腺素劑量與分娩經驗對誘發泌乳牛隻泌乳性狀和生理反應之影響 |
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作者 | 劉炳燦; 鄭三寶; 楊忠亮; 朱志成; | 書刊名 | 國立屏東技術學院學報 |
卷期 | 3 1994.06[民83.06] |
頁次 | 頁219-234 |
分類號 | 437.3 |
關鍵詞 | 誘發泌乳; 不孕乳牛; 雌素二醇; 助孕酮; 泌乳性狀; Induced lactation; Infertile cows; Estradiol; Progesterone; Lactational performance; |
語文 | 中文(Chinese) |
中文摘要 | 捌頭繁殖障礙之乾乳荷蘭種乳牛供探討應用外源性性腺素誘發泌乳時,性腺素劑 量與分娩經驗對泌乳性狀和內泌素處理後之生理反應之影響。 試驗動物依性腺素劑量 2 組 ×分娩經驗 2 組之設計, 逢機分配, 每組 2 頭。 劑量處理分為全劑量〔( estradiol benzoate 0.1mg+progesterone 0.25mg ) /kg.BW/day 〕和半劑量(全劑景之一半) 2 組 ;分娩經驗分經產和未經產 2 組。處理開始時不顧及試驗牛之生殖生理周期。 外源性性腺 素經由皮下注射, 連續 7 日, 每日分 2 次(首次注射之日為第 1 日),在第 18 ∼ 20 日,各組均經由肌肉注射 dexamethasone 0.028mg/kg.BW/day,連續 3 日,每日 1 次,而 於第 21 日同提供搾乳。內泌素處理期間及泌乳期間各組均定期採集血液和乳汁樣品,俾供 檢測雌素二醇和助孕酮等血清中之性腺素,與乳糖、乳脂和乳蛋白質等牛乳組成分之含量。 試驗牛迄開始提供搾乳之 31 日止或其後之泌乳期中,若每日之泌乳量未達 2 kg/day, 則 予乾乳處理。 試驗牛之誘乳成功率為 100 %,泌乳期平均為 219 日, 泌乳高峰呈現在泌乳期之第 8 ∼ 10 週, 不論是否具有分娩經驗,劑量別間之泌乳能力(泌乳期之長短、呈現泌乳高峰之週 別及該週之泌乳量、總泌乳量)差異不顯著。而經產牛之泌乳日數、泌乳高峰週之週泌乳量 和總泌乳量等, 均顯著低於未經產牛隻組(> 36 月齡)者( 152 ± 69 286 ± 23 日, 34 ± 8 vs 62 ± 19kg,762 ± 232 vs 1731 ± 633kg,p<0.05 )。 試驗牛隻血清中雌 素二醇和助孕酮之含量于性腺素處理結束時, 自處理前(第 0 日)之 16pg ╱ ml vs 1.2ng/ml (全劑量組與半劑量組)迅速增加至結束時(第 8 日)之最高值( 1276pg ╱ ml vs 2.4ng ╱ ml ),之後即迅速下降,迄開始提供搾乳(第 21 日)時,則均已近于採 自同背景畜群中正常分娩母牛血液樣品之分析值( 59pg ╱ ml vs 0.6ng ╱ ml ), 於性 腺素處理劑量別和分娩經驗別間, 僅全劑量組于性腺素處理開始後第 10、16、18、 20 和 21 日之雌素二醇值顯著( p<0.05 )或極顯著( p<0.01 )地高於採自同期間之半劑量組 之血液樣品者,其餘血樣中之雌素二醇或助孕酮之含量,在本試驗設計之各分組間,均未見 顯著之差異。 於生乳組成分中,除未經產牛組之乳糖含量顯著高于經產牛組( 4.9 ± 0.3 vs 4.2 ± 0.4 %,p<0.05 )外,其餘各項在劑量別間和分娩經驗別間差異皆不顯著。 試 驗牛隻於性腺素處理期間,迄首次搾乳前後,多呈現發情前期之行為,唯其卵巢則均見萎縮 ,未能被診知有濾泡或黃體之存在,於性腺素處理之劑量別間並無明顯之差異。 綜合本研究之結果顯示:牛隻個體別間反應于性腺素處理之泌乳能力差異大,然其經誘乳處 理後,生乳中之營養組成分均在正常變異範圍內。在本試驗應用之外源性性腺素劑量下,自 性腺素處理後,迄首次提供搾乳時,試驗牛隻之卵巢均呈萎縮之現象。而當應用之性腺素劑 量較提高時,反應之總泌乳量雖有增加之趨勢(全劑量組╱半劑量組= 126 %,P>0.05 ) ,唯處理期間牛隻血清中之雌素二醇值將相對提高,于血中持續之時間亦較久( p<0.05 ) 。 |
英文摘要 | Eight nonlactating infertile Holstein cows were randomly allotted to 2 × 2 treatment groups to examine the effects of the dose levels (1 dose or 1/2 dose) of the exogenous ovarian hormones (1 dose = 0.1mg estradiol benzoate plus 0.25mg progesterone/kg.BW/day) and calving experience (multipara or nullipara) on the lactational performance and physiological response of the cows hormonally induced into lactation in the hot season in Taiwan. The protocol of the hormonal treatment was subcutaneous injections of estradiol benzoate and progesterone twice daily for 7 consecutive days (the day of the 1st. injection was defined to day 1 of the treatment), followed by 0.028 mg dexamethasone (synthetic glucocorticoids)/ kg.BW/ day, once daily, IM, on day 18 to 20, milking was all commenced on day 21. The cow was dried off when her milk production was not more than 2.0kg/day by milking day 31 or during her milking period thereafter. Two animals that were in postpartum lactation in the same herd were designated as controls in this study. The appearance of the udder developed and the adverse side effect (proestrous activity) during treatment period, success rate (100%), weeks to peak production (8-10 weeks), persistence of the milking period (219 days), actual or projected ME-2x-305d-FCM production, percents of the fat、 protein or lactose in milk, and changes of progesterone in serum during the first 35 days of the experiment period were not significantly different (p>0.05) between the dose levels designed. Ovaries of the induced animals were regressed uniformly during treatment period. No apparent difference of the nutrient composition could be detected between the induced milk and that of the control animals in the same herd. However, the estradiol concentration in serum was significantly promoted (p<0.05) near and especially that on the day of 1st. milking, and total milk production tended to elevate but showed no statistical significance while the higher dose level was applied (ratio of the total production was: 1 dose group / 1/2 dose group=1.26). Results of the observations revealed by the nulliparous (age>36 months) and the multiparous cows showed that the milking days、 lactose content (% ) in the induced milk and total milk production (ME-2x-305d-FCM) of the former were significantly higher than that of the latter (p<0.05), but the others were similar to that of the effects of the dose levels. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。