| Material Information
||Progress report utilization of different forms of phosphate as measured by the isotope method
||Animal husbandry mimeograph series
||2 leaves : ; 28 cm.
||Arrington, Lewis Robert, 1919-
Davis, George K
University of Florida -- Dept. of Animal Husbandry and Nutrition
||University of Florida, Dept. of Animal Husbandry and Nutrition
||Place of Publication:
||Phosphorus in animal nutrition -- Florida ( lcsh )
Beef cattle -- Feeding and feeds -- Florida ( lcsh )
||government publication (state, provincial, terriorial, dependent) ( marcgt )
non-fiction ( marcgt )
||Statement of Responsibility:
||L.R. Arrington and G.K. Davis.
| Record Information
||University of Florida
||All rights reserved by the source institution and holding location.
||oclc - 76953260
Animal Husbandry Mimeograph
Series No. 58-7 March, 1958
PROGRESS REPORT: UTILIZATION OF DIFFERENT
FORMS OF PHOSPHATE AS MEASURED BY THE ISOTOPE METHOD1
L. R. Arrington and G. K. Davis2
Studies of phosphorus utilization by steers have been continued using
the method outlined in Animal Husbandry Mimeograph Series No. 57-7, Florida Agri-
cultural Experiment Station, June, 1957. The experiment has included work with
mature animals and with younger, growing animals.
Results are recorded in Table I as the percent of phosphorus absorbed.
These results should not be accepted as conclusive but as a summary of the work
done to date. Some of this work will be repeated, and experiments: with swine are
presently in progress using the same phosphates.
The apparent absorption represents the difference between the6amount
of labeled phosphorus administered and that appearing in the feces within 14h hours
after administration. Net absorption was determined by accounting for phosphorus
which had been absorbed and re-excreted. The amount of labeled phosphorus appearing
in the feces following an intravenous dose of labeled phosphorus was used as a
measure of the re-excretion. For growing steers, this value was eight percent;
for mature steers, 18 percent. These respective values were then added to the
apparent absorption to determine net absorption.
Another comparison with the reference standard has been made by arbi-
trarily giving the absorption of CaHPO4 a value of 100. The relative values for
the test phosphates on this basis appear in the last column of Table I.
1. Supported in part by a grant from Coronet Phosphate Co., Norfolk, Virginia
and Soft Phosphate Research Institute, Ocala, Florida.
2. Arrington, Associate Animal Nutritionist; Davis, Animal Nutritionist; Depart-
ment of Animal Husbandry and Nutrition, University of Florida, Gainesville,
Absorption of Phosphorus Within 144 Hours After
Oral Administration of the Labeled Phosphate
CaHPO4 2 7122 89.2 100
Phosphate A 5 60.5 78,5 88
Phosphate B 3 54.2 72.2 81
This measure of absorption using labeled or radioactive phosphate is
designed to be a direct measure of the phosphorus available to the animal under
the conditions studied. The values obtained by this method thus far are not in
complete agreement with results obtained by other methods. These differences
will be evaluated as the research continues.
Tests of the availability of phosphorus from different sources for
cattle have been made using an isotope method. Preliminary results indicate that
the phosphorus in reagent grade CaHPO0 is utilized to the greatest degree fol-
lowed by defluorinated rock phosphate and soft phosphate.
Animal Husbandry and Nutrition
March 20, 1958
II I I I I II I