J. Anim Sci.
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J. Anim Sci. 1968. 27:519-524.
© 1968 American Society of Animal Science
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Variability within and among Experiment Stations in the Determination of In Vivo Digestibility and Intake of Alfalfa1

R. F. Barnes

U. S. Department of Agriculture and Purdue University, Lafayette, Indiana2

Abstract

An in vivo method for the determination of digestibility and voluntary intake during a 30-day trial has been developed and tested in a collaborative study at six Agricultural Experiment Stations. The magnitude of variability among sheep within stations was greater than that among stations for dry matter digestibility measured during the restricted intake phase. The same was true for voluntary intake.

The variation in the determination of chemical constituents and their digestibility emphasizes the importance of sampling and the preparation of forages for analysis. More attention in sampling procedures is suggested.

Further in vivo trials of this nature could contribute toward the procurement of forage samples with accurate measures of in vivo digestibility and intake for use in laboratory studies.

Footnotes

1 Journal Paper No. 3079 of the Agricultural Experiment Station, Purdue University, Lafayette, Indiana. Invited paper presented at the Symposium on Coordinated Research on Forage Evaluation, 58th Annual Meeting of the American Society of Animal Science, New Brunswick, New Jersey.

2 Crops Research Division, Agricultural Research Service and Department of Agronomy, Lafayette, Indiana.

3 Illinois, F. C. Hinds; Indiana, R. F. Barnes; Iowa, R. L. Veter and W. F. Wedin; Michigan, J. W. Thomas; Missouri, W. H. Pfander and C. W. Gehrke and Ohio, K. E. McClure and R. R. Johnson.






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Copyright © 1968 by the American Society of Animal Science.