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김재환(J . H . Kim),F . Thalheimer(F . Thalheimer),정재혁(J . H . Chung),김강식(K . S . Kim) 한국축산학회 1991 한국축산학회지 Vol.33 No.3
The objective of this study was to understand the causal structure between the milk production cost items and to find out informations to improve the dairy farm management system for the reduction of production cost by the analysis of survey of dairy farms done at Livestock Experiment Station in Korea for I year from May 1987 to April 1988. The results obtained are as follows ; 1. Costs of labor and concentrate were the most important factors for the reduction of milk production cost. 2. Implement and building had little effect on the reduction of labor and roughage cost. 3. Under present dairy farm management system. the raising scale had much effect on the reduction of production cost, while roughage area had little.
김강식,박용윤,차영호,정재혁,박홍석 ( K . S . Kim,Y . Y . Park,Y . H . Cha,J . H . Chung,H . S . Park ) 한국축산학회 1989 한국축산학회지 Vol.31 No.4
A digestion trial with four wether lambs and a feeding trial with sixteen Holstein cows of late lactation were conducted to evaluate nutritive value of soyhull and its feeding value to lactating cows. Digestibility of dry matter, crude protein and crude fiber were 78.0, 69.9 and 74.0%, respectively and total digestible nutrient content of soyhull was about 68.8%. When soyhull was included in dairy concentrates for replacement of the same amount of corn at the levels of 5.5, 11.0 and 16.5% of concentrates (fed about 7㎏ a day), milk production gradually decreased but milk fat content was increased. When milk production per unit concentrate or total feed consumed was calculated soyhull was as efficient as corn in providing energy for milk production but the energy content of soyhull was lower than that of corn, which caused slightly lower milk production in cows fed a limited amount of concentrates containing soyhull.