J. Anim Sci.
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J. Anim Sci. 1965. 24:305-312.
© 1965 American Society of Animal Science
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Interrelations of Botanical and Chemical Dietary Components of Animals Grazing Dry Annual Range1

G. M. Van Dyne2 and H. F. Heady

University of California,3 Davis and Berkeley

Abstract

LITTLE is known about the comparative botanical and chemical composition of the diets of livestock grazing similar ranges or about interrelations existing among dietary components (Cook, 1954; Cook et al., 1963; Van Dyne et al., 1964). The factors governing palatability of range forages and preference by grazing animals are complex and are not well understood, because of the difficulty of accurately measuring dietary composition (Cook and Stoddart, 1953; Garner, 1963; Heady, 1964). Sampling forage by clipping does not accurately simulate grazing under range conditions, but recently esophageal and ruminal fistulas have been used to obtain forage samples from grazing animals (Van Dyne and Torell, 1964). Botanical and chemical composition of fistula forage samples may be determined, although they are too extensively masticated to permit separating plant species or parts for chemical analyses.

This paper reports studies of chemical and botanical composition of grazed forage samples to investigate the following problems: (1) Do animals graze certain plants, plant parts, and chemical constituents in relatively constant proportions, or are dietary components independent of each other?

Footnotes

1 G. P. Lofgreen, J. H. Meyer, and W. C. Weir are acknowledged for their suggestions. This work was partially supported by U.S.D.A. Regional Research Project W-34 and by N.I.H. Grant FR-00009.

2 Present address: Radiation Ecology Section, Oak Ridge National Laboratory, Oak Ridge, Tennessee.

3 Animal Husbandry Department and School of Forestry.






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Copyright © 1965 by the American Society of Animal Science.