Nitrogen Utilization of Goats Fed Silage with or without Supplements Having Different Rumen Degradability

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  • NISHINO Naoki
    Department of Animal Science and Technology, Faculty of Agriculture, Okayama University
  • OKAMOTO Nobushige
    Department of Animal Science and Technology, Faculty of Agriculture, Okayama University
  • UCHIDA Senji
    Department of Animal Science and Technology, Faculty of Agriculture, Okayama University

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  • ルーメン内分解性の異なる補助飼料の給与がサイレージを摂取した山羊の窒素利用性に及ぼす影響

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Abstract

Effects of feeding corn, barley and sugar beet pulp to silage based diet on the nitrogen (N) utilization of goats were studied. These supplements were selected due to having the difference in rumen degradation. Four rumen cannulated goats were fed the diets consisting of wilted ryegrass (Lolium multiftorum Lam) silage and the supplements (4 : 1 on dry matter (DM) basis). Silage was solely used for the control diet and N intake was adjusted by urea added to the diets including supplements. The wilted silage showed the pH value 4.72 and relatively high NH3-N concentration (16.7%/total-N). The soluble fraction of DM in the rumen was 58.0, 26.8 and -1.25%, and the rate of degradation was 0.042, 0.107 and 0.099h^<-1>, for corn, barley and sugar beet pulp, respectively. Dietary inclusion of corn significantly increased DM and organic matter digestibility, and that of barley increased hemicellulose digestibility compared with the control diet. Urinary excretion of allantoin increased when goats fed the supplements, but the difference failed to be significant. Ruminal concentration of NH_3-N and retention of N showed no significant difference among the treatments, but feeding barley tended to lose more N compared with the other supplements in this study.

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