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http://dx.doi.org/10.5187/JAST.2003.45.2.241

Evaluation of Feed Values of Korean Straws Using Pressure Transducer  

Lee, Sang S. (School of Agric. Biotechnol., Seoul National University)
Ha, J. K. (School of Agric. Biotechnol., Seoul National University)
Chang, M. B. (Animal Science & Technology, Chung-Ang University)
Publication Information
Journal of Animal Science and Technology / v.45, no.2, 2003 , pp. 241-250 More about this Journal
Abstract
Accurate and rapid evaluation of the nutritional quality of Korean straws is important because of the recent increase in the use of these feedstuffs in Korean. The aim of the study was to establish with relationships between ruminal fermentation of Korean straws and in vitro gas production using a pressure transducer. The pressure transducer system includes pressure censors, AD board, LED monitor, and the computer with real-time graphics. Both gas production and DM digestibility data were fitted into the exponential equation P = a + b (1-e-$1-e^{-ct}$). The initial rate of gas production was highest for rice straw, followed by barley straw and wheat straw. The gas production rate of constant (c) in gas production for rice straw, wheat straw, and barley straw were 3.8, 2.5, and 2.5 $%h^{－1}$, respectively. Total VFA concentration (mM) produced after 72h incubation was similar among three Korean straws, even though was variable during the early (12h) fermentation. Volume of gas production was related (P> 0.05: r = 0.76 to 0.83) to DM disappearance and also strongly related (p< 0.05: r = 0.91 to 0.98) to VFA concentration at all incubation times. Linear correlation showed between gas production and DM disappearance and VFA by in vitro will be matched in in vivo digestibility.
Keywords
Pressure transducer; Gas production; VFA; Linear correlation;
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