Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Ruminal Degradability of Tropical Feeds and Their Potential Use in Ruminant Diets

  • Chanjula, P. (Department of Animal Science, Faculty of Agriculture, Khon Kaen University) ;
  • Wanapat, M. (Department of Animal Science, Faculty of Agriculture, Khon Kaen University) ;
  • Wachirapakorn, C. (Department of Animal Science, Faculty of Agriculture, Khon Kaen University) ;
  • Uriyapongson, S. (Department of Animal Science, Faculty of Agriculture, Khon Kaen University) ;
  • Rowlinson, P. (Department of Agriculture, University of Newcastle upon Tyne)
  • Received : 2002.07.21
  • Accepted : 2002.10.14
  • Published : 2003.02.01
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Abstract

The objective of this study was to determine the degradability of cassava chip (CC), cassava waste (CW), yellow sweet potato (YP), white sweet potato (WP), purple sweet potato (PP), corn meal (CM), and rice bran (RB) using in situ technique. Two ruminally fistulated steers with an average weight of $303{\pm}10kg$ were used to determine in situ degradabilities of DM and OM. Seven feed sources were weighted in nylon bags ($38{\mu}m$ pore size) and incubated ruminally for 1, 2, 4, 6, 8, 12, 24, and 48 h. The results showed that asymptote (a+b) and effective degradability (ED) of DM of energy sources ranked from the highest to the lowest; CC, YP, WP, PP, RB, CW, and CM (99.3, 92.5; 97.6, 87.9; 97.5, 87.9; 97.2, 87.8; 87.5, 63.6; 78.6, 63.0 and 81.7; 59.3, respectively) and for OM asymptote (a+b) and effective degradability (ED) were similar to those of degradation of DM (99.4, 93.4; 98.8, 89.8; 98.5, 89.4; 98.4, 88.1; 92.4, 65.8; 85.1, 66.9 and 83.6, 63.3, respectively). It was concluded that disappearance characteristic of CC was the highest and it may potentially facilitate the achievement of optimal ruminal availability of energy: protein especially with NPN for microbial protein synthesis.

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References

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