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KMID : 1025520090510010053
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Journal of Animal Science and Technology
2009 Volume.51 No. 1 p.53 ~ p.60
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Effects of Concentrate Feeding Method and Slaughter Age on Growth Performance, Feed Intake and Carcass Characteristics of Hanwoo Steers
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Cho Young-Moo
Kim Jin-Hyoung
Kwon Eung-Gi
Baek Bong-Hyun
Chang Sun-Sik
Kim Hyeong-Cheol
Kim Tae-Il
Park Byung-Ki
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Abstract
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Thirty one Hanwoo steers were used in a completely randomized design experiment to see the effects of concentrate feeding method(group vs. individual feeding) and age at slaughter(26 vs. 28 months of age) on growth performance, feed intake and carcass characteristics. Steers were randomly assigned to one of four groups, G26(group feeding slaughtered at 26 months of age), G28(group feeding slaughtered at 28 months of age), I26(individual feeding slaughtered at 26 months of age) or I28(individual feeding slaughtered at 28 months of age). Amount of concentrate were restricted to 1.5% of BW for the growing period and 1.8% of BW for the early fattening period in both groups. For the late fattening period, concentrate were given ad libitum for G26 and G28, but were given up to 1.7% of BW for I26 and I28. Average daily gains were higher in individual feeding groups (I26 and I28) than those in group feeding groups(G26 and G28) for the early fattening period(p<0.05). ADGs were higher in group feeding groups than those in individual feeding groups (p<0.05). Concentrate intake in individual feeding groups tended to be higher compared to that in group feeding groups for the early fattening period, but tended to be higher in group feeding groups compared to that in individual feeding groups for the late fattening period. Feeding method or slaughter age had no significant effects on carcass characteristics, yield grade and quality grade. Shear force and tenderness of longissmus muscle were higher in groups slaughtered at 28 months of age than in groups slaughtered at 26 months of age(p<0.05). Feeding method or slaughter age had no effects on cooking loss, water holding capacity, juiciness, flavor, moisture, protein and fat of longissmus muscle.
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KEYWORD
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Hanwoo steer, Feeding method, Age at slaughter, Carcass characteristics
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