J. Anim Sci.
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J. Anim Sci. 1973. 36:982-985.
© 1973 American Society of Animal Science
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Chromic Oxide and Crude Protein Excretion in the Bovine as Influenced by Water Restriction1

D. L. Cross, J. A. Boling and N. W. Bradley2

University of Kentucky, Lexington 40506

Abstract

Twelve yearling Aberdeen Angus steers were assigned to two periods and two treatments in a factorial experiment designed to study the effect of water restriction on the excretion of chromic oxide and crude protein. Each steer was confined to a metabolism crate and received 4 kg of a ration plus water free choice or 60% free choice daily. During each period, fecal grab samples were taken at 2-hr, intervals for 48 consecutive hr. followed by a 7-day total collection of feces. The percent recovery of chromic oxide averaged 103.1 and 102.3 for the steers offered water free choice or 60% of free choice, respectively. There was no difference (P>.05) in the apparent digestion of crude protein between treatments as calculated by a 7-day total collection of feces or by the chromic oxide indicator method. There was also no difference (P>.05) attributable to the method used for determination of apparent digestion of crude protein or dry matter. There was an increase in dry matter digestibility and chromic oxide concentration in fecal dry matter (P<.05) when water was restricted. Water restriction did not affect (P>.05) crude protein concentration of fecal dry matter. These data suggest that water restriction has little effect on the excretion of chromic oxide and crude protein. The lack of constancy in the ratio of nutrient to indicator excretion with time indicates the need for a sampling procedure which includes each 2-hr, interval throughout the day.

Footnotes

1 This paper (no. 72-5-27) is published with the approval of the Director of the Kentucky Agricultural Experiment Station.

2 Department of Animal Sciences.






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