Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Ensiling Characteristics and the In situ Nutrient Degradability of a By-product Feed-based Silage

  • Kim, Y.I. (RIBS, Division of Food Bioscience, College of Health and Medical Life Sciences, Konkuk University) ;
  • Oh, Y.K. (National Institute of Animal Science, RDA) ;
  • Park, K.K. (Animal Resource Research Center, Konkuk University) ;
  • Kwak, W.S. (RIBS, Division of Food Bioscience, College of Health and Medical Life Sciences, Konkuk University)
  • Received : 2013.07.25
  • Accepted : 2013.10.24
  • Published : 2014.02.01
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Abstract

This study was conducted to evaluate the ensiling characteristics and the in situ degradability of a by-product feed (BF)-based silage. Before ensilation, the BF-based mixture was composed of 50% spent mushroom substrate, 21% recycled poultry bedding, 15% ryegrass straw, 10.8% rice bran, 2% molasses, 0.6% bentonite, and 0.6% microbial inoculant on a wet basis and ensiled for up to 4 weeks. The BF-based silage contained on average 39.3% moisture, 13.4% crude protein (CP), and 52.2% neutral detergent fiber (NDF), 49% total digestible nutrient, and 37.8% physically effective $NDF_{1.18}$ on a dry matter (DM) basis. Ensiling the BF-based silage for up to 4 weeks affected (p<0.01) the chemical composition to a small extent, increased (p<0.05) the lactic acid and $NH_3$-N content, and decreased (p<0.05) both the total bacterial and lactic acid bacterial counts from $10^9$ to $10^8$ cfu/g when compared to that before ensiling. These parameters indicated that the silage was fermented and stored well during the 4-week ensiling period. Compared with rice or ryegrass straws, the BF-based silage had a higher (p<0.05) water-soluble and filterable fraction, a lower insoluble degradable DM and CP fraction (p<0.05), a lower digestible NDF (p<0.05) fraction, a higher (p<0.05) DM and CP disappearance and degradability rate, and a lower (p<0.05) NDF disappearance and degradability rate. These results indicated that cheap, good-quality BF-based roughage could be produced by ensiling SMS, RPB, rice bran, and a minimal amount of straw.

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