Group Title: Animal husbandry mimeograph series - University of Florida Department of Animal Husbandry and Nutrition ; 58-7
Title: Progress report
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Permanent Link: http://ufdc.ufl.edu/UF00072870/00001
 Material Information
Title: Progress report utilization of different forms of phosphate as measured by the isotope method
Series Title: Animal husbandry mimeograph series
Physical Description: 2 leaves : ; 28 cm.
Language: English
Creator: Arrington, Lewis Robert, 1919-
Davis, George K
University of Florida -- Dept. of Animal Husbandry and Nutrition
Publisher: University of Florida, Dept. of Animal Husbandry and Nutrition
Place of Publication: Gainesville Fla
Publication Date: 1958
 Subjects
Subject: Phosphorus in animal nutrition -- Florida   ( lcsh )
Beef cattle -- Feeding and feeds -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: L.R. Arrington and G.K. Davis.
General Note: Caption title.
General Note: "March, 1958."
 Record Information
Bibliographic ID: UF00072870
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 76953260

Full Text
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/no. 7


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,
Florida.







-2-


TABLE I

Absorption of Phosphorus Within 144 Hours After
Oral Administration of the Labeled Phosphate


Phosphate

CaHPO4

Phosphate A

Phosphate B


No.
Tests

8

12

18


Growing Calves
Apparent
Absorption


76.7

64.8

55.6


Net
Absorption


84.7

72.8

63.6


Mature Steers

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.


Summary

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
Nutrition Laboratory
200 Copies
March 20, 1958


CaHPO4
as 100

100

86

75


I I


II I I I I II I




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