J. Anim Sci.
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J. Anim Sci. 1951. 10:335-336.
© 1951 American Society of Animal Science
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Distribution of P32 in the Tissues of a Steer Fed Grass from Land That Received Labeled Fertilizer1

Ray L. Shirley2, George K. Davis2 and J. R. Neller3

Florida Agricultural Experiment Station

Abstract

The possibility of following an element from fertilizer through the soil and the forage to the animal has often been suggested as an application of isotopic elements, but to the writers' knowledge, no one has actually reported such an experiment, although the practice of using plants to synthesize compounds for experiments with animals is well known. In the fall of 1949, an area of Marlboro fine sandy loam was fertilized with a superphosphate fertilizer containing radioactive P32 and sown with fescue grass. Due to dry weather the fescue grass failed and the area was replanted with oats. A mixture of fescue and oats was harvested which weighed 1260 grams and contained sufficient P32 to give off approximately 75,000 beta degradations per minute as measured with a dipping-type Geiger-Mueller tube.

A young steer weighing 420 pounds was put in a digestion rack and fed the grass at 6 p.m. The steer finished the dried grass by noon of the following day and was then allowed to eat a cured mixed hay ad libitum until he was sacrificed the next morning at 9 a.m.

Footnotes

1 Published with the permission of the Director of the Florida Agricultural Experiment Station. The labeled fertilizer was received from the Bureau of Plant Industry, U. S. D. A., Beltsville, Maryland after allocation from the Atomic Energy Commission Isotopes Division, Oak Ridge, Tennessee.

2 Department of Animal Husbandry and Nutrition.

3 Department of Soils.






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Copyright © 1951 by the American Society of Animal Science.