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KMID : 1025520010430050681
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Journal of Animal Science and Technology
2001 Volume.43 No. 5 p.681 ~ p.694
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Effect of Pasture Grazing and Concentrate Feeding Levels for 6 Months of Growing Steps on Growth Performance and Carcass Characteristics in Autumn Born Hanwoo Steers
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임석기/Im, S. K.
우제석/강수원/손용석/정종원/Woo, J. S./Kang, S. W./Son, Y. S./Jeong, J. W.
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Abstract
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This study was conducted to investigate the effect of pasture grazing and concentrate feeding levels for 6 months of growing steps in autumn born Hanwoo steers. Feeding trial was conducted with 3 treatment groups which were T1(full feeding of concentrate and hay for 18 months) and T2(pasture grazing with 1.5% of apparent body weight in concentrate for 6 months and concentrate full feeding for pre-and post-pasture grazing), T3(1.5% of apparent body weight and full feeding in concentrate at pre-and post-grazing period, respectively).
During the over-all period, average daily gains increased higher in the order of T2, T3 and T1. TDN intakes required per unit of kilogram-gain were 7.922 to 8.695㎏(average 8.347㎏) and decreased in the order of T2. T1 and T3. Dressed carcass and retailed cut percentage was 61.1 to 63.7%(average 62.1%) and 62.4 to 66.1%(average 64.5%1, respectively, with significantly difference(P$lt;0.05) and the former were increased in the order of T1, T2 T2 and T3 but the latter were decreased in the order of T2, T3 and T1.
Appearant rate of 1st grade or more in meat quality was 62.5 to 87.5%(average 75%) and increased in the order T1. T2 and T3. Back-fat thickness and marbling score was 7.0 to 10.5㎜(average 8.4㎜) and 4.5 to 5.2(average 4.8), respectively. and the former was higher in the order of T1, T2 and T3 but the latter was higher in the order of T1, T3 and T2.
In chemical composition of beef. the percentage of moisture, protein, fat and ash were 64.8 to 67.6%(average 66.6%). 18.9 to 20.1%(average 19.6%). 10.1 to 14.4%(average 11.6%), 0.88 to 0.94% (average 0.92%), respectively. In addition. the rate of moisture. protein, ash were higher but fat was lower in T2 and T3 than in T1.
Income was higher in T2 and T3 than in T1, and income of T2 was increased by 29 percent in comparison to T1.
According to the above results it may be concluded that autumn born Hanwoo steers have to raised from the coming spring to autumn on the rotational grazing pasture with 1.5% of apparent body weight in concentrate. Thereafter it is necessary to increase the concentrate by up to full feeding level for about l2 months to produce high quality of meat and increase income.
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