Effect of Kinds of Hay Given to Sheep on Rumen Degradability of Protein of Various Hays

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  • KAMEL H. E. M.
    Department of Veterinary Science, Faculty of Agriculture, Tottori University
  • SEKINE Junjiro
    Department of Veterinary Science, Faculty of Agriculture, Tottori University
  • SUGA Tetsuyuki
    Department of Veterinary Science, Faculty of Agriculture, Yamaguchi University
  • MORITA Ziro
    Department of Veterinary Science, Faculty of Agriculture, Tottori University

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  • 乾草蛋白質の第一胃内分解率に及ぼす給与乾草の影響
  • カンソウ タンパクシツ ノ ダイ1イナイ ブンカイリツ ニ オヨボス キュウヨ

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Four kinds of hay (Italian ryegrass, IR; bermudagrass, BG; Sudangrass, SG and alfalfa, AL) were given ad libitum to wethers in a Latin square design in order to determine the effects of diet on the degradability (dg) of hay protein. Ruminal degradation of hay protein was determined by the in situ technique. The passage rate of ruminal digesta was measured using a chromium-mordanted neutral detergent fiber. The dg values did not differ significantly when they were determined under the feeding of different hays as a sole diet. Mean dg values showed relatively large variation under the feeding of different hays. The dg value of hay protein appeared to show smaller variation under feeding of the same hay as that of the incubated sample. AL feeding tended to cause larger variation in the dg values of grass hays. A relatively high correlation was found between dg values and crude protein (CP) digestibility and dry matter degradability. The approximate dg value of forage protein (dgCP) may be estimated by the following equation, with CP dlgestibility (CPDIG) as a variable; dgCP=0.195+0.86(±0.14)CPdig, r2=0.669, s.e.±0.012.

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