頁籤選單縮合
| 題 名 | 生長與肥育荷蘭公牛利用尿素適量之研究 |
|---|---|
| 作 者 | 陳茂墻; 陳吉斌; | 書刊名 | 中華農學會報 |
| 卷 期 | 114 1981.06[民70.06] |
| 頁 次 | 頁73-81 |
| 關鍵詞 | 公牛; 生長; 肥育; 荷蘭; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 為了探討肉用荷蘭公牛利用尿素之適當用量並加以驗證，此間一連進行了四個試驗。在生長荷蘭公牛體重165~241公斤之間，分別以尿素代替日糧蛋白質的0, 11, 22, 33%，以第二組之增重率較接近對照組(0.808比0.823公斤)，且較經濟(46.48比50.47元)；第三組與第四組之增重率與經濟性均比對照組差。 在肥育荷蘭公牛體重396~479公斤之間，分別以尿素代替日糧蛋白質的0, 20, 30, 40%，結果增重率分別為0.927±0.198，0.872±0.168，0.693±0.190，0.705±0.126公斤。每公斤增重之飼料費分別為69.00，67.77，83.27，78.45元，以第二組之增重率較接近對照組而且較經濟。 試驗三處理1，日糧含自然性蛋白質9.51%。處理2，日糧含自然性蛋白質8.54%添加尿素提升為10.54%。處理3，日糧含自然性蛋白質11.98%。處理4，日糧含自然性蛋白質10.34%添加尿素提升為12.33%。以體重396~500公斤之荷蘭公牛試驗結果增重率分別為1.14±0.13，1.25±0.07，1.14±0.19，1.14±0.32公斤。每公斤增重之飼料費分別為62.64，56.07，69.92，67.71元。 試驗四以平均體重371.6公斤之荷蘭公牛試驗，日糧之精料分別為30, 50, 70%每一種日糧又分別以尿素代替蛋白質0, 20, 30, 40%。日糧精料多的處理，牛隻之血漿尿素量較低，日糧精料50%以下時以尿素取代蛋白質的20%?可顯著(p<0.01)增加血漿尿素量。日糧精料70%時雖然增加但不顯著。 |
| 英文摘要 | A series of experiments were conducted to investigate the optimum level of urea for growing and fattening Holstein bulls and its effects on plasma urea content. In Experiment I, 16 Holstein bulls with an average body weight of 171.62 kg were divided into four groups and individually fed with four different rations for 90 days. The rations contained 12% crude protein with 0, 11, 22 and 33% replaced by urea. The results indicated that the average daily gain were 0.823±0.131, 0.808±0.217, 0.775±0.131 and 0.598±0.240 kg and the feed cost per kg gain were 50.47, 46.48, 50.58, 63.85 NT$, respectively. This animals in group 2 of Experiment I had a daily gain close to the control group and was more economical, and the urea intake was 30 gm per animal per day in this group. In Expperiment II, 16 Holstein bulls with an average body weight of 402.18 kg were divided into four groups and subject to four treatments. The rations in four treatments contained 11% crude protein, and urea was added to replace 0, 20, 30, 40% of the crude protein. During the experimental period, the animals were fed individually for 90 days. The average daily gain were 0.927±0.198, 0.872±0.168, 0.693±0.190, and 0.705±0.126 kg and the feed cost per kg gain were 69.00, 67.77, 83.27, 78.45 NT$, respectively. The urea intake was 80 gm per animal per day in the second group. Experiment III was a 2×2 factorial design. The rations of the four treatments contained 9.51, 8.54, 11.98 and 10.34% of natural protein and 80 g urea was added to rations 2 and 4 to increase its crude protein to 10.54 and 12.33%, respectively. Sixteen Holstein bulls with an average body weight of 402.15 kg were allocated into these four treatments and fed with four different rations for 92 days. The average daily gian were 1.14±0.13, 1.25±0.07, 1.14±0.19, 1.14±0.32 kg and the feed cost per kg gain were 62.64, 56.07, 69.92, 67.71 NT$, respectively. In Experiment IV, 16 Holstein bulls with an average body weight of 371.62 kg were divided into four groups for four treatments in three stages of trial, each lasting four weeks. In the first stage, a basal ration containing 30% of concentrate and 11% crude protein was used, and urea was added to the basal ration to replace 0, 20, 30, 40% of the crude protein. At the end of trial, the average plasma urea nitrogen contents were 4.66, 7.34, 6.22, 7.99 mg/ 100 ml, respectively, for the four groups of cattle. In the second stage, a ration of 50% concentrate was used, the plasma urea nitrogen contents of cattle were 3.17, 5.15, 5.37 and 6.62 mg/100 ml, respectively, for the treatments of 0, 20, 30 and 40% NPN in rations. In the third stage, a ration of 70 % concentrate was used, the plasma urea nitrogen were 2.64, 3.85, 3.18, 5.19 mg/ 100 ml respectively, for the treatments of 0, 20, 30, and 40% NPN in rations. The plasma urea nitrogen contents of the cattle fed on rations containing 30 and 50% concentrate with 20% of the crude protein replaced by urea were significantly (P<0.01) higher than those of controls. When the ration containing 70% concentrate was fed, the plasma urea nitrogen content of cattle was not significantly higher than those of controls until 40% of the crude protein was replaced by urea. |
本系統中英文摘要資訊取自各篇刊載內容。