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Digestibility and Rate of Passage by Steers Fed Tall Fescue, Alfalfa and Orchardgrass Hay in 18 and 32 C Ambient Temperatures^{1, 2,}

University of Missouri- Columbia 65201

Abstract

Digestibility and ingesta rate of passage were determined with Holstein steers fed chopped tall fescue "Festuca arundinacea Schreb,/alfalfa "Medicago sativa" and orchardgrass "Dactylis glomerata" hay in 18 and 32 C temperatures. Steers fed alfalfa ate more and drank more water than steers fed orchardgrass or fescue; alfalfa was more digestible. Digestible dry matter (DDM), water intake and mean retention time (MRT) increased as temperature increased. Maximum excretion rate (MER) and MRT, determined by using ¹⁴⁴Ce, were not related to voluntary forage intake. The data indicate that if gut fill is a regulating mechanism in the intake of forages as suspected, then MRT and MER are not good estimates of gut fill.

¹ Contribution from Missouri Agricultural Experiment Station. Journal Series No. 6755. Approved by the Director.

² The authors thank Dr. Jack Clark, Dr. H. W. Taylor, Dr. J. T. McGinity, Bill Laurence and Weldon Diener for their assistance during the course of this experiment.

³ Department of Dairy Husbandry.

⁴ Department of Agronomy.

⁵ Department Nuclear Science.