J. Anim Sci.
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J. Anim Sci. 1972. 34:846-850.
© 1972 American Society of Animal Science
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Comparison of 99Mo Metabolism in Young Cattle and Swine1

J. K. Miller, B. R. Moss2, M. C. Bell and N. N. Sneed

University of Tennessee Agricultural Research Laboratory, Oak Ridge 378303

Abstract

Molybdenum metabolism was investigated in 13 calves fed alfalfa hay free choice plus a limited grain ration and in six pigs fed a corn-soybean-alfalfa meal ration. The 99Mo was administered to pigs by mixing in their feed and to calves by capsule (rumen dose) or in warm water suckled from nipple pails (abomasal dose). Following single doses to calves, more 99Mo was absorbed from abomasal than from rumen administration as indicated by higher plasma and urinary levels and lower fecal excretion. Apparent absorption of 99Mo after seven daily doses averaged 74.8% for six pigs, 29.8% from rumen doses by four calves, and 62.2% from abomasal doses for four calves. The 99Mo was absorbed from each section of the digestive tract from the gastric stomach through the small intestine as determined by ratio to 144Ce144Pr used, as a non-absorbed reference material. No appreciable 99Mo absorption was apparent from the rumen or omasum, but net 99Mo absorption by calves was doubled when these compartments were bypassed. Results indicate that molybdenum may be combined into a biologically unavailable form through processes occurring in the rumen.

Footnotes

1 This manuscript is published with the permission of the Dean of the University of Tennessee Agricultural Experiment Station, Knoxville.

2 Present address: Animal and Range Sciences Department, Montana State University, Bozeman 59715.

3 Operated by the Tennessee Agricultural Experiment Station for the U. S. Atomic Energy Commission under Contract AT-40-1-GEN-242.






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Copyright © 1972 by the American Society of Animal Science.