Studies on daily gain carcass composition and feed efficiency at different growing fattening periods and the optimum marketing weight in korean native bulls

Peak, B.H.; Shin, K.J.; Kim, Y.K.; Lee, K.S.; Kim, K.S.

Research Reports of the Rural Development Administration 29(1 LIVESTOCK AND VET): 6-13


Accession: 006506151

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This experiment was carried out to investigate the optimum market weight of Korean Native Bull at different growing-fattening periods. Bulls were raised in open barns (5 bulls per pen) and fed concentrates and roughages ad libitum, and marked at four different body weight (350, 450, 550 or 650kg). As the market weight increased, average daily gain decreased (1.04, 1.03, 1.01 and 0.98 kg, respectively) and nutrient requirements (per 1kg gain) increased as the market weight increased (4.51, 4.97, 5.62 and 6.21kg respectively in T.D.N). As market weight increased, carcass percentage gradually increased (57.2, 59.6, 61.3 and 63.7%, respectively) but retailed cuts percentage decreased (63.4, 63.1, 62.4 and 59.3%, respectively). Fat percentage of carcass abruptly increased when the bulls weighed more than 550kg. From the economical point of view, the optimum market weight was 503.5kg of live weight when the live weight price was 2,500 won per kg and 534.2kg when 3,000 won per kg. From the results of this experiment the optimum market weight of Korean Native Bull would be 500-550kg in live weight, although there is a difference depending on the price of live weight and concentrate.