乳牛におけるチモシー乾草の自由採食量と飼料組成, 第一胃内滞留時間, 消化率, 消化速度との関係  [in Japanese] Relationship Voluntary Intake of Timothy Hay in Daily Cattle and Chemical Compositions, Staying Time in the Rumen, Digestibility, Digestible Speed.  [in Japanese]

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Abstract

刈り取り時期の異なるチモシー乾草4点について, 乳牛による自由採食試験, めん羊による消化試験およびin vitro消化試験を実施した。チモシー乾草の乾物摂取量(DMI)と飼料成分含量, 第一胃内滞留時間, めん羊消化試験による各種成分消化率およびin vitro消化試験による総繊維の消化速度との関係からチモシー乾草におけるDMIに影響を及ぼす要因を解析した。 チモシー乾草のDMI日量および代謝体重当たりDMIは, 供試牛4頭の平均値がそれぞれ6.5kg/日〜9.1kg/日, 56.99/kg^<0.75>〜78.8g/kg^<0.75>であった。DMI日量と飼料成分の関係では, 酵素分析法による低消化性繊維(Ob), 細胞内容物(OCC)と高消化性繊維(Oa)を合算した値, 酸性デタージェントリグニン(ADL)との間に高い相関が認められ, DMI(Kg/日)は, -0.18×Ob+19.5, -0.50×ADL+12.1, 0.19×(OCC+Oa)-1.6の推定式で求めることが可能となった。また, DMI日量と第一胃内滞留時間, 各成分の消化率, 消化速度との間にも高い相関が認められた。代謝体重当たりDMIについても同様の結果であった。さらに, チモシー乾草のDMI日量と繊維成分含量, 第一胃内滞留時間消化率および消化速度との関係を明らかにした。

Three experiments carried out to study effects of characteristics of feed and animal condition on voluntary intake. The voluntary feed intake measured as dry matter intake (DMI) with four dairy cows fed timothy hays ad libitum. The digestibility of chemical compositions of the timothy hays obtained from total collection method with sheep. The rate of degradation of fiber in the tureen was calculated from in vitro method. Mean daily DMI and DMI per metabolic body weight of four timothy hays ranged from 6.5 to 9.1 kg/day, from 56.9 to 78.8 g/kg^<0.75>, respectively. The daily DMI of timothy hays by dairy cows was closely related with organic b fraction (Ob), sum of organic cellular contents and organic a fraction (OCC+Oa), and acid detergent lignin (ADL). The daily DMI can predict from following regression equations; DMI=-0.18×Ob+19.5 (r=0.993), DMI=-0.50×ADL+12.1 (r=0.997), DMI=0.19×(OCC+0a)-1.6 (r=0.993). In addition, the daily DMI of timothy hays by dairy cows was closely related with retention time in the tureen, digestibility of each chemical compositions of the timothy hays and rate of degradation of fiber in the tureen. Similar values were observed in DMI per metabolic body weight. From those result it was cleared that each factor examined in this study effect on voluntary feed intake.

Journal

  • Japanese Journal of Grassland Science

    Japanese Journal of Grassland Science 44(3), 248-254, 1998

    Japanese Society of Grassland Science

References:  15

Cited by:  6

Codes

  • NII Article ID (NAID)
    110003850325
  • NII NACSIS-CAT ID (NCID)
    AN00194108
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0447-5933
  • NDL Article ID
    4613825
  • NDL Source Classification
    ZR7(科学技術--農林水産--農産) // ZR22(科学技術--農林水産--畜産)
  • NDL Call No.
    Z18-344
  • Data Source
    CJP  CJPref  NDL  NII-ELS  IR  J-STAGE 
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