No abstract

Two experiments were conducted in which zeolites were added to broiler diets at the 1% level beginning at 21 days of age. In one study, diets with different energy levels were used to determine if an interaction existed between zeolite supplementation and nutrient density. No beneficial effects of zeolite supplementation on body weights were observed in either experiment. There were no statistically significant differences in feed utilization between diets with and without zeolites, and the numerical differences could be accounted for by the addition of 1% inert zeolite.(

Experiments were conducted at three geographic locations in the United States (Arkansas, Colorado, and Minnesota) to examine the response of Large White turkeys to bambermycins in the presence of halofuginone. Each location utilized diets commonly used at that station for growing turkeys. All diets contained 3 ppm halofuginone, and were supplemented with 0, 1, 2, or 4 g bambermycins/ton (908 kg). Bambermycins was fed from day-old to marketing; halofuginone was removed from feed for 3 days prior to marketing. Although there were some significant differences in final body weights or feed utilization among locations, there were no significant interactions of location X bambermycins. Body weight of males was significantly (P less than .05) improved by the addition of 2 g bambermycins/ton. Body weight of females was significantly (P less than .05) improved by all levels of bambermycins; 4 g/ton stimulated significantly (P less than .05) superior gains than 1 or 2 g/ton. When body weight for both sexes was combined, bambermycins at 2 and 4 g/ton resulted in significant (P less than .05) improvements in body weight. Feed utilization, expressed as units of feed per unit of gain, was not significantly influenced by dietary treatment. There were no significant differences in mortality related to location or dietary treatment.

Four feeding trials were conducted in which Large White turkeys were fed diets containing either amprolium or butynorate to 8 or 9 weeks of age to female and male turkeys, respectively. Diets fed during the study contained from 0 to 10% supplemental fat to provide a range of dietary energy levels. Poults were maintained on built-up wood shavings litter with no attempts to induce coccidiosis. Turkeys fed diets with amprolium did not grow as well or convert feed as efficiently as those fed butynorate at 8 or 9 weeks of age when the additives were withdrawn. However, at market weights or feed utilization between turkeys fed the two different anticoccidials.