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題 名 | 不同來源之氮素對瘤胃內代謝之影響 |
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作 者 | 陳茂墻; | 書刊名 | 中華農學會報 |
卷 期 | 81 1973.03[民62.03] |
頁 次 | 頁61-68 |
關鍵詞 | 代謝; 氮素; 瘤胃; |
語 文 | 中文(Chinese) |
中文摘要 | 此地應用3對雙胞胎?管水,水牛、黃牛、荷蘭牛各1對一連作了2個試驗均以糖蜜(30%)及甘藷簽為碳水化合物,第1個試驗以稻草(25%)第二試驗以乾草(25%)為粗料。第1個試驗之目的在探求此種情況下以尿素取代日糧蛋白質的0, 25, 35, 50, 75%對瘤胃內代謝的影響以便適當加以應用。第2試驗以3×3拉丁方格方式比較含有大豆餅,尿素、?糞內之飼料對瘤胃代謝之影響。2個試驗的飼料均分早晚2次給與其結果如下: (一)飼與不同尿素量所得瘤胃之pH在6.18至6.84間,以尿素取代日糧蛋白質25、25%之瘤胃pH比其他各組低,以75%組之pH較高,在飼後2小時瘤胃pH最低,此時25、35%尿素氮者比0%者低而50%與75%者比0%者高。 (二)大豆餅組?未用尿素者瘤胃?氨濃度隨著時間的變化很小。添加尿素者在飼後一小時氨的產量最高0, 25, 35, 50, 75%組瘤胃?氨之量分別13.9、24.3、23.1、26.1、33.9 mg NH3-N/100 ml 到飼後的6小時瘤胃?氨的濃度在高尿素組呈現較低的現象。 (三)尿素取代日糧蛋白質0至35%對瘤胃?乙酸、丙酸、乳酪酸、戊酸的濃度無影響,50%時乙酸、乳酪酸的濃度減少,而丙酸的濃度增加;75%時戊酸的濃度減少,瘤胃?異位戊酸的濃度隨著尿素用量的增加而減少。利用高劑量尿素時瘤胃?低脂酸的總濃度亦較低。 (四)尿素取代日糧中蛋白質50%以上時飼料之適口性差,牛對?糞飼料3~7天?可適應。 (五)在此試驗?糞氮取代部份大豆餅氨對瘤胃內氨的量無影響。 (六)除了乳酪酸以尿素組為高外,大豆餅、尿素、?糞飼料對瘤胃內其他低脂酸無影響。 |
英文摘要 | Six fistulated animals, one pair each of the water Baffalo, Holstein and native Yellow were used in two experiments consecutively. Based on a molasses-sweet potato chips-rice straw/hay ration, in first experiment, urea-N was used to substitute 0, 25, 35, 50, 75% of the nitrogen in the rations; second experiment was conducted in a 3×3 latin square method, urea-N and nitrogen in the poultry excreta were composed 25% of the ration-nitrogen to replace soybean. Feeds were offered twice daily in both experiment. In terms of pH, volatile fatty acid, and ammonia were studied, the folowing results were obtained. 1. Rations contained more than 50% urea-N became less palatable; cattle was accustomed to the poultry excreta containing ration 3-7 days. 2. In first experiment, the rumen pH ranged from 6.18 to 6.84. It was lower for the lots of 25 and 35% urea-N, but highest for the lot of 75% urea-N. The rumon pH been lowest 2 hour after feeding. Where the lots of 25, 35% urea-N were lower than control, while the lots of 50 and 75% were higher than control. 3. The rumen ammonia of the control lot produced steadily from one hour prior to feeding to six hours after feeding. Rumen ammonia raised rapidly and reached peak one hour after feeding. In the urea-containing rations there been 13.9, 24.3, 23.1, 26.1, 33.9 mg ummonia-N/100 ml resectively for the lot of 0, 25, 35, 50, 75% urea-N rumen ammonia returned to the lower level 6 hours after feeding especially in the lot of high urea. 4. The concentration of isovaleric acid was decreased while the increasing of urea-N-High amount of urea lowered the production of total VFA. 0-35% urea-N in the ration had no effects on acetic, propionic, butyric and valeric acid production, in the lot af 50% urea-N acetic and propionic acid were reduced but butyric acid increased, in the lot of 75% valeric acid was reduced. 5. Poultry exereta containing ration did not affect the ammonia content of rumen fluid. 6. Except that butyric acid was higher in the lot of poutlry excreta, no statistical difference were found among the lot of soybean meal, urea, poultry excreta to affect the production of volatile fatty acids. |
本系統中英文摘要資訊取自各篇刊載內容。