Abstract
Summary
Experiments with 40-day-old chicks and 60 weanling Sprague Dawley rats were conducted. The experimental subjects were immunized with jackbean urease injected during the first 4 weeks of experiments lasting 8. weeks. During the 4-8 week or post injection period, the immunized chicks gained 905 g vs. 777 g for their controls and were more efficient in converting feed to weight gain. In 2 successive experiments immunized rats grew slightly faster and showed a difference in feed efficiency which was statistically significant. In both chicks and rats there were no differences in body weight during the 0-4 week injection period. Antibodies to urease were demonstrable in sera of immunized rats by in vivo methods with C-14 urea and by in vitro tests. Soybean diets were fed.
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