J. Anim Sci.
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J. Anim Sci. 1971. 33:695-697.
© 1971 American Society of Animal Science
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Nutrient Digestibility using Fecal Collection Apparatus and Indicator Method for Steers Fed Ad Libitum1

P. A. Phar2, N. W. Bradley, C. O. Little, L. V. Cundiff3 and J. A. Boling

University of Kentucky, Lexington 40506

Abstract

Six 2-year-old steers weighing an average of 453 kg were randomly assigned to a cross-over design to study the effects of fecal collection apparatus on the apparent digestibility of nutrients when a complete, pelleted ration was fed ad libitum and to compare total collection versus chromic oxide indicator coefficients. Chromic oxide was mixed with the ration prior to pelleting at the rate of 0.5%. Fecal samples were taken twice during a 24-hr, period and composited at the end of the 6-day collection period for each steer. Sampling times representing each 2-hr, interval were randomly assigned to days. Average daily feed intake was not significantly affected by fecal collection apparatus. There was no significant difference in crude protein, crude fiber, ether extract, N.F.E. or gross energy coefficients calculated by the conventional and indicator methods; however, there was a significantly (P<.01) lower dry matter coefficient when calculated by indicator method. When the indicator method of estimating digestibility was used to compare the effect of collection apparatus versus no apparatus on digestibility of nutrients, the N.F.E. digestibility was significantly (P<.05) lower in the steers without the fecal collection apparatus. Coefficients of digestibility for dry matter, crude protein, crude fiber, ether extract and gross energy were not significantly (P>.05) affected by fecal collection apparatus.

Footnotes

1 The investigation reported in this paper (No. 69-5-155) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the Director.

2 Present address: Kansas State University, Manhattan.

3 Present address: U.S.D.A. Animal Husbandry Research Division, University of Nebraska, Lincoln.






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