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Journal of Dairy Science Vol. 56 No. 12 1567-1569
© 1973 by American Dairy Science Association ®
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Strontium as an Indicator of Rumen By-Pass Efficacy

R. D. Hedde1 and G. M. Ward

Department of Animal Science, Colorado State University, Fort Collins 80521

ABSTRACT

A procedure has been developed for determination of the efficacy of rumen by-pass in calves. The procedure utilizes strontium as a tracer of bottle fed liquids. The concentration of strontium in the rumen after bottle feeding is a measure of the proportion of bottle fed liquid that failed to by-pass the rumen. Strontium dosage required for detection of 10% by-pass failure was 5 mg/kg body weight. The optimum time for rumen sampling after dosing was 30 min. Strontium in the rumen was determined on stomach tube samples by atomic absorption spectroscopy. The procedure was readily accomplished with typical laboratory supplies and possibly could be used to determine rumen liquid volume.

FOOTNOTES

1 Present address: Animal Science Department, Syntex Research, Palo Alto, California 94304.






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