J. Anim Sci.
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J. Anim Sci. 1964. 23:963-966.
© 1964 American Society of Animal Science
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Effect of Jackbean Urease Injections and Chlortetracycline on Rate of Gain and Feed Efficiency in Swine

Hudson A. Glimp and Allen D. Tillman1

Oklahoma Agricultural Experiment Station, Stillwater,2

Abstract

Two trials involving fifty-five Yorkshire x Poland China barrows were conducted to study the effects of immunity to jackbean urease on rate of gain and feed efficiency in swine.

In the first trial, with factorially-arranged treatments including 100 ppm chlortetracycline in the diet and 100 Sumner units of urease injected intraperitoneally, chlortetracycline improved (P<.01) rate of gain and feed efficiency while the urease did not. A high initial serum titer against urease was observed, and further injections failed to increase this titer. In the second trial injections of up to 300 Sumner units of urease failed to increase the initial titer against urease and had no effect on feed efficiency and rate of gain.

A technique of assaying for antiurease titer that involves a direct urease assay is reported.

Footnotes

1 Department of Animal Science.

2 Approved by the Director.






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