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題 名 | 瘤胃可分解蛋白質與碳水化合物之組合對乳牛產乳與瘤胃微生物蛋白質合成之影響=Effect of Rumen Degradable Protein and Carbohydrate Formulation on Dairy Cows' Milk Yield and Rumen Microbes' Protein Synthesis |
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作 者 | 徐濟泰; | 書刊名 | 科學農業 |
卷 期 | 47:5/6 民88.06 |
頁 次 | 頁212-217 |
分類號 | 437.3 |
關鍵詞 | 瘤胃可分解蛋白質; 瘤胃可分解碳水化合物; 乳牛; Rumen degradable protein; Rumen degradable carbohydrate; Dairy cattle; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究計畫的目的是探討是否可藉由氫氧化鈉-過氧化氫的鹼化處理飼糧中乾草 ,以提升瘤胃可分解碳水化合物之供應,進而促進乳牛泌乳表現或從增加瘤胃微生物蛋白質 合成來節省蛋白質飼料原料使用量。 本計畫動物試驗採用平均泌乳天數為 165 天的六頭泌 乳牛,以二重複 3 × 3 拉丁正方試驗設計 (三個試驗期,每個試驗期包含 17 天適應期與 4 天採樣期 ),分別餵飼三種試驗飼糧 (飼糧原料組成大致為苜蓿乾草 14.7 %,盤固乾草 20.2 %, 玉米 20 %,其餘為黃豆、大麥、酪蛋白、糖蜜、麩皮、礦鹽與維生素 ):對照 組 (飼糧一 ) 條件為中洗纖維≧ 24 %, 酸洗纖維≧ 17 %, 非結構性碳水化合物≧ 30 %,總粗蛋白質 17 %,瘤胃可分解粗蛋白質 11.5 % (所有成分均以總飼糧乾物質為基礎 ); 飼糧二的配方如對照組,但芻料部分的盤固乾草先經鹼化處理以提升其纖維消化率;飼 糧三的伺料配方條件如同飼糧二,但將總粗蛋白質含量降為 15.4 %,以測試鹼化處理盤固 乾草是否可提高瘤胃微生物蛋白質合成而節省蛋白質飼料原料用量。三種飼糧採任飼情況下 ,牛隻平均每日乾物質採食量分別為 18.5,20.4, 20.5kg,顯示鹼化處理盤固乾草可提高 飼糧的適口性; 4 %乳脂修正乳量、乳脂率、 乳蛋白含量分別為 20.5 kg/d, 3.57 %, 3.23 %;21.9 kg/d,3.45%,3.20 %;18.5kg/d,3.59 %,3.44 %,顯示鹼化處理盤固 乾草有增加產乳量趨勢,但是無法在減少飼糧總粗蛋白質含量時防止乳產量滑落。三種飼糧 飼養牛隻血液總蛋白質、血糖、尿素氮濃度分別為 6.2 g/dL, 72.2 mg/dL, 5.0 mg/dL; 6.3 g/dL,73.3 mg/dL,5.4 mg/dL;6.2 g/dL,71.8 mg/dL,5.3 mg/dL,顯示三組牛均稍 有缺蛋白質現象。人工瘤胃試驗亦顯示,三種試驗處理的瘤胃液氨態氮濃度偏低,有蛋白質 不足的狀況,並且鹼化處理盤固乾草於本試驗條件下無能提高瘤胃微生物蛋白質合成,因此 無法容許降低飼糧蛋白質含量。 |
英文摘要 | This study investigated the possibility to increase milk yield of dairy cows or cut down dietary protein level through higher rumen microbial protein synthesis by NaOH-H �� O �� treatment of dietary hay source. Six lactation dairy cows (avg.day in milk=165 d) were used in a duplicate 3 × 3 Latin square experimental design with 17 d adjustment and 4 d collection per period. Three experimental diets were: diet 1 (control) was formulated to be NDF ≧ 24%, ADF ≧ 17%, nonstructural carbohydrate ≧ 30%, crude protein (CP)=17% and rumen degradable CP=11.5% (on dry basis); diet 2 was similar to diet 1 except that the pangola hay was treated with NaOH-H �� O �� solutions to increase the ruminal fiber digestibility; diet 3 was similar to diet 2 except of dietary CP cut to 15.4% to test whether NaOH-H �� O �� treatment of pangola hay can increase the microbial protein synthesis to make up the shortage of dietary protein. Dry matter intake of cows fed three experimental diets were 18.5, 20.4 and 20.5 kg/d, respectively, indicating the improved palatability of ration by alkali-treated forage. The 4% fat-corrected milk yield, milk fat, milk protein of cows fed three experimental diets were 20.5 kg/d, 3.57%, 3.23%; 21.9 kg/d, 3.45%, 3.20%; 18.5 kg/d, 3.59%, 3.44%, respectively, indicating the NaOH-H �� O �� treatment tended to improve milk yield, but unable to prevent the decrease of milk production with lower dietary protein level. Blood total protein, glucose, and urea nitrogen levels of three treatment groups of cows were 6.2 g/dL, 72.2 mg/dL, 5.0 mg/dL; 6.3 g/dL, 73.3 mg/dL, 5.4 mg/dL; 6.2 g/dL, 71.8 mg/dL, 5.3 mg/dL, respectively, indicating all three groups were slightly deprived of protein supply for body metabolism. Experiment of continuous culture showed low ruminal ammonia concentrations for all three experimental diets, indicating shortage of protein supply in the rumen. NaOH-H �� O �� treament of pangola hay did not increase the microbial protein synthesis which, in turn, will not allow the dietary protein to be lowered. |
本系統中英文摘要資訊取自各篇刊載內容。