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KMID : 1025520040460020193
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Journal of Animal Science and Technology
2004 Volume.46 No. 2 p.193 ~ p.200
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Determination of Energy Requirements for Maintenance in Hanwoo Steers
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김경훈/Kim, K. H.
오영균/김원/이상철/신기준/전병태/Oh, Y. G./Kim, W./Lee, S. C./Shin, K. J./Jeon, B. T.
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Abstract
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This experiment was carried out to determine energy requirements for maintenance of Hanwoo steers. Nine Hanwoo steers weighing 376.6±12.5㎏ were used in this experiment and fed rice straw(44%) and concentrate(56%) at three different energy levels; 0.8 times maintenance(0.8M), 1.2 times(1.2M) and 1.6 times(1.6M), respectively. Dry matter intake was 48.5, 65.9 and 86.5g/BW^(0.75) for 0.8M, 102M and 1.6M, respectively. Increase in energy intake with the increased DM intake did not affect digestibilities of dry matter, organic matter, crude protein, crude fiber, crude fat and nitrogen-free extract. Gross energy intake averaged 190.8, 255.8 and 340.9kcal/BW^(0.75) for 0.8M, 1.2M and 1.6M, respectively. Energy loss was 41% feces and 0.6~1.5% urine of gross energy intake. Further, energy loss from methane produced during rumen fermentation was 5~9%, while body heat loss averaged 40~60%. Intercept of the regression equation between ME intake and retained energy indicated that energy requirement for maintenance was 124.3kcal ME/BW^(0.75).
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