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This article in AJ

  1. Vol. 66 No. 3, p. 358-360
    Received: Aug 27, 1973

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Effects of Diet of Fistulated Steer on In Vitro and In Vivo Nylon Bag Digestibility of Forage-Corn Mixtures1

  1. Warren G. Monson and
  2. Phillip R. Utley2



We evaluate dry matter digestibility of several thousand forage samples annually. This study was designed to assess the effects of a major diet change of a fistulated steer on in vitro and in vivo nylon bag dry matter digestibility estimates of several forages and forage-corn (Zea mays L.) mixtures. The major variable was a change in the diet of the fistulated steer from ‘Coastal’ bermudagrass (Cynodon dactylon (L.) Pers.) hay to a concentrate ration of corn (72%), peanut (Arachis hypogaea L.) hulls (20%), and protein supplement (8%). The correlation between in vitro dry matter digestion values on samples utilizing inoculum from a steer fed the two diets was .97. The correlation coefficient for the nylon bag dry matter digestion values for samples digested in a recipient steer fed the two diets was .95. The data indicate that a diet change need not interrupt a forage screening program aimed at relative ranking of substrate but could jeopardize nutritive evaluations.

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