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Thesis (M.S.)—University of Nebraska—Lincoln, 1969. Department of Poultry Science.


Copyright 1969, the author. Used by permission.


Six experiments were conducted to evaluate the effect of added nifursol on growth and feed utilization in turkeys and its efficacy against histomoniasis.Data from these experiments indicate or suggest that nifursol tends to stimulate growth, is not toxic at levels of 50 to 1600 ppm, and has good efficacy against histomoniasis at relatively low levels.

Three growth studies were conducted in which nifursol levels of 50 to 1600 ppm, were fed in a practical-type, corn-soybean diet (28 percent protein).Turkeys fed from day old to four weeks of age were used in these studies.None of the nifursol levels depressed body weight gain or increased mortality as compared to the unsupplemented basal diet.

Nifursol, when fed continuously to male and female turkeys from day-old to 24 weeks of age at levels of 0, 50, 75, 100, and 200 ppm., tended to increase or had no effect on body weight gain.Survival and body weight data indicated that nifursol at the levels used was not toxic over extended feeding periods.

Two histomoniasis exposure experiments were conducted with poults 33-71 ad 78-121 days of age.Mortality and morbidity due to histomoniasis were significantly reduced (P<0.05) in the medicated, exposed poults as compared to the unmedicated, exposed poults. The data indicated that the level of nifursol added to diets of older birds may be reduced below the level necessary for protection in younger birds, due to the increased feed and/or drug intake of older turkeys.The most effective protection against mortality and morbidity due to histomoniasis in both experiments was observed with the addition of 75 ppm of nifursol in the diets.

Advisor: Thomas W. Sullivan