Abstract
Two trials involving fifty-five Yorkshire × 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.
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