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Journal of Nutrition Vol. 83 No. 3 July 1964, pp. 218-224
Copyright © 1964 by American Society for Nutrition
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Influence of Dried-grass Silage and Silage Fractions on the Basal Metabolic Rate of Rats1

G. A. McLaren, R. O. Asplund2, D. G. Crow3, L. I. Tsai and I. D. Porterfield4

West Virginia University, Morgantown, West Virginia

Seven metabolism trials were conducted to determine the influence of ground dried-grass silage (DGS), or fractions of DGS on the basal metabolic rate (BMR) of rats. Incorporation of 20% of each of 5 samples of DGS, ensiled in 4 different years, into the diets increased BMR above that of rats fed a control ration. Increased BMR was observed in growing and mature male and female rats fed diets containing DGS; however, a much greater increase in BMR occurred in males than in females. Ground grass hay of similar botanical composition to that of the grass silage had no effect on BMR when it made up 20% of the diet. Histological examination of the thyroids of rats fed 2 samples of 1957 DGS revealed increases in the height of the follicular epithelial cells. DGS which had been extracted first with petroleum ether then with absolute ethanol was more active in increasing BMR than the unextracted DGS. Extraction of the petroleum ether-absolute ethanol extracted DGS with 80% ethanol removed most of the BMR stimulating activity. Hot aqueous extraction of the residue of the 80% ethanol extraction removed the remainder of the activity.

1 Published with the approval of the Director of the West Virginia Agricultural Experiment Station as Scientific Paper no. 721 from the Department of Animal Industry and Veterinary Science.

2 Present address: Department of Chemistry, University of Wyoming, Laramie.

3 Present address: School of Veterinary Medicine, Oklahoma State University, Stillwater.

4 Present address: Department of Animal Science, North Carolina State College, Raleigh.

Manuscript received 1 February 1964.




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