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KMID : 1025520110530020155
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Journal of Animal Science and Technology
2011 Volume.53 No. 2 p.155 ~ p.160
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Determination of Maintenance Energy Requirements for Growing Hanwoo Steers
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Seol Yong-Joo
Kim Kyoung-Hoon
Baek Youl-Chang
Lee Sang-Cheol
Ok Ji-Woun
Lee Kang-Yeon
Hong Seong-Koo
Chang Sun-Sik
Song Man-Kang
Choi Chang-Weon
Lee Sung S.
Oh Young-Kyoon
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Abstract
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Present experiment was carried out to determine maintenance energy requirements for growing Hanwoo steers. Six Hanwoo steers (BW = kg) were used in two 3 3 latin square design with three different energy intake levels; TDN 1.70 kg (Low), 2.05 kg (Medium), 2.80 kg (High), respectively, based on the Korean Feeding Standards. Each period lasted 18 days including a 14-day adaptation and a 4-day measuring period. The steers were in the head hood chamber system (one cattle per chamber) during each measuring time to measure heat and methane production for 1 day. Dry matter intake was 2,058, 3,256 and 3,881 g/day for Low, Medium and High TDN, respectively. Increase in energy intake did not affect digestibilities of dry matter, crude protein, crude fiber, crude fat, NDF, ADF and nitrogen-free extract. Gross energy intake averaged 180.21, 292.74 and 337.15 kcal/ for Low, Medium and High TDN, respectively. Energy loss was 28.7% in feces and 2.1% in urine of gross energy intake. Further, energy loss from methane produced during rumen fermentation was 6~8.3%, while body heat loss averaged 34~60%. Intercept of regression equation between ME intake and retained energy indicated that the energy requirement was 109.84 kcal ME/.
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KEYWORD
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Maintenance energy, Energy balance, Energy requirement, Hanwoo
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