한우의 기초대사에 필요한 에너지 및 질소에 관한 연구 = Study on Energy and Nitrogen Requirement for Basal Metabolism of Korean Native Cattle

다국어 초록 (Multilingual Abstract)

This study was conducted to measure the heat production of fasting animals known as basal metabolism on the process of investigating the maintenance energy and nitrogen of Korean native cattle to establish a feeding standard. The five cows were employed and the Brouwer`s equation was utilized to measure the heat production from oxygen consumption, carbon dioxide and methane production and urinary nitrogen. The results obtained were as follows : 1. The digestibility and retention rate of nitrogen were determined as 44% respectively, through the digestion trial carried out prior the fasting experiment for 7 days. 2. The amount of nitrogen excreted during the 5th and 6th days of fasting experiment was known as 224.69 ㎎ per metabolic body size (three quarter power of kg body weight) per day. 3. The hours spent standing and frying were investigated as 770.72 min. (53.52%) and 669.28 min. (46.48%), respectively, during the respiration trial. The times changing position was 8.6 a day. 4. The heat production on the basis of lying position was 53.94 ㎉ per metabolic body size per day for Korean native cows tested. This figure was found as similar to that of Japanese cattle but considerably lower than those of the other species of beef and dairy cattle investigated in foreign countries.