학술논문 > 농학 > 축산 (자료번호 : H68851)
성장하는 한우독에 대한 요소의 사양가치 ( The Feeding Value of Urea for Growing Korean Cattle ) - 농학 > 축산
From a study of cellulose digestion, in 1891, Zuntz pointed out that the rumen bacteria and other microorganisms could synthesize protein from digested non-protein nitrogenous compounds in the digestive tract of the ruminants. He expressed the view that the rumen bacteria use by prefered non-protein nitrogenous compounds instead of protein. Therefore, he concluded that ruminants an utilize amides, ammonium sails, urea, and even nitrates as well as protein itself. After the year, other studies clearly shown that the feeding effect of urea is striking than another non-protein nitrogenous compounds. Fortunately We can produce feed urea cheaply by industrial process with ammonia and carbon dioxide. From 1935 to 1938, many investigations were conducted in Germany and also concluded in Unite-States during the second world war. Now, urea a practically used by all farm animals as feed. Vo¨ltz(1992) and Hanson(1923) reported that milking cows which fed with low protein basal diet added 100 to 200 grams of urea increased milk production. Murray C.A. and Romyn A.E. conducted experiment on urea as a possible substitute for pea nut cake for wintering heifers. Red poll heifers varing in age fines 10 to 18 months were wintered for 93 days on ration as below: $lt;[표]생략$gt; They concluded that all groups were equally growth well and that urea can be used as substitute fer peanut cake. Maynard L. A. and his associates(1942) indicated that Holstein calves receiving whole milk were given a diet of yellow corn 20 parts, com starch 33, chopped timothy hay 30, cane molasses 10, bone meal 2. salt 2 and urea 4 parts, as soon as they would consume dry feed. The calves continued to grow at a fairly normal rate after the milk was removed from the diet at 7 weeks of age. Calves fed the basal diet without urea failed increase in body weight after milk feeding was discontinued. Many other experiments also pointed out the Ruminants can utilize the feed urea as a substitute fur protein, An experiment was conducted under the direction of professor Yun in order to determine the feeding value of urea for growing Korean cattle. This experiment was conducted at Whasan Livestoc Experiment station wish 10 heads of calves oaring in age from 6 to 10 months. The animal used were 4 heads of young male calves and a heads of young female calves. These calves were divide into two lots with 5 heads each. One of them were for experiment and the other were for control purpose. The experiment was started on July 31, 1956, and completed on October 8, 1956. Through, 10 weeks of this experimental period including a week of preliminary experimental period, good quality of grasses and concentrates was fed twice daily. From the beginning of this experiment, as individual weight and body measurement of each calves were takes at every 7 days throughout the whole period. The ration used were formulated according to be Morrison feeding standard for growing cattle. $lt;[표] 생략$gt; * 2 Parts of limestone and I part of salt was supplemented above ration. The ration was increased to the rate of gain 1 All lots were hand feel twice daily. Fresh water was provided liberally at the pen and exercise was taken from 6 to 8 hours everyday throughout the entire experimental period. Discussion of Experimental Results, 1. Average Daily gain. The gain ranged from 0.528 to 0.271 ㎏. per head daily in the case of lot I which was fed urea and from 0.314 to 0.313 ㎏. per head daily in the: case of lot 2, which was fed sesame oil meal as protein supplement. Considered as a unit lot I had an average daily gain of 0.432 ㎏. per heady A gain from 0.432 to 0.2246 per head daily is usually unsatisfactory on calves, However, according to the analysis of staisties we concluded that this results o experimental lot has significance. 2. Feed consumption per 100 ㎏. gain. The concentrates required for 100 ㎏. of gain of lot I for entire experiment was 282.24 ㎏. whereas lot 2 fed seseme oil
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