Graduate Thesis Or Dissertation
 

Canola meal as a protein source in chicken diets

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  • Several experiments involving broilers and laying hens were conducted with the primary goal of evaluating the feeding value of Canola meal (CM) in both broiler and laying hen rations. A secondary goal was to study the growth response of broilers receiving higher concentrations of CM in their starter diets to supplements of protamone, arginine, methionine and/or zinc bacitracin. In the broiler experiments, satisfactory performance was obtained by feeding diets in which CM replaced up to 50% of soybean meal (SBM). However, growth and/or feed consumption and efficiency of feed utilization were adversely influenced by feeding CM at replacement levels higher than 50%. Protamone at 0.0025% of the diets containing CM at 50% and 100% reduced the enlarged thyroids of birds fed such diets to a size approaching that of controls, but a 0.005% level of protamone greatly reduced the size of the thyroids below that of birds fed the corn-SBM diet. No growth response was associated with the lower protamone dietary treatment, when a significant reduction in growth was observed to feeding the diets containing the higher protamone rate. Dietary supplements of arginine, methionine and zinc bacitracin did not appear to have a positive effect on performance of broiler chicks fed the starter diets at which CM substituted for higher levels of SBM. In all the broiler trials, there were no significant differences between the dietary treatments for the incidence of a leg abnormality condition, however, in experiment 4, when the chicks were fed the starter rations in which CM replaced 50% and 100% of SBM, a numerical increase in the occurrance of this condition was observed. In the laying hen experiment, CM which replaced up to 100% of SBM of the experimental rations, did not have any adverse effect on hen egg production, efficiency of feed utilization-, external and internal egg quality or final body weight. Fertility and hatchability of fertile eggs as well as dropping scores were also not significantly influenced by such dietary treatments. In both the broiler and laying hen trials, thyroid glands tended to be slightly enlarged with increasing levels of CM in the diets.
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