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Journal of Dairy Science Vol. 42 No. 4 686-691
© 1959 by American Dairy Science Association ®
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A Comparison of Nitrogen and Energy Determinations on Fresh and Oven-Air Dried Cattle Feces 1

J. W. Bratzler and R. W. Swift

Department of Animal Nutrition, Pennsylvania State University, University Park

ABSTRACT

Samples of fresh cow feces, obtained from 12 different animals, were subjected to analysis for total moisture (dry matter), nitrogen, and gross energy. These analyses were made both on the fresh and on the oven-air dried materials. Total moisture of the fresh feces was determined in three ways, and gross energy of the fresh feces was determined with the aid of two different primers, 95% ethyl alcohol and benzoic acid. Gross energy of the dried feces was determined without the use of any primer.

The samples of fresh feces were dried in a forced-air oven for a period of 22 hr. at a temperature of 65° C. Small but consistent losses of nitrogen, average of 5.15%, occurred upon drying, as well as the liberation of 727 mg. of carbon dioxide per 100 g. of fresh feces. The average levels of the determinations of gross energy were 66.31, 71.17, and 71.24 Calories per 100 g. of fresh feces for the ethyl alcohol, benzoic acid, and oven-air dry methods, respectively. The composite standard errors between duplicates for the energy determinations, expressed as Calories per 100 g. of fresh feces, were 3.70, 2.17, and 0.22 for the ethyl alcohol, benzoic acid, and oven-air dry methods, respectively. Under the conditions of drying fresh cow feces employed in this experiment, only small losses of nitrogen occurred, and there was no loss of gross energy.

FOOTNOTES

1 Authorized for publication on September 19, 1958, as Paper No. 2294 in the Journal Series of the Pennsylvania Agricultural Experiment Station.






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Copyright © 1959 by the American Dairy Science Association ®.