The focus of this study was to evaluate a feed enzyme (Rovabio Excel) in diets fed to commercial broilers reared in environments typical to that observed in the US broiler industry and destined to be marketed at BW at or near 2.5 kg. The feed enzyme was tested in diets differing in amino acid and energy composition. The main effect of altered nutrient levels, mainly reduced amino acids, was higher abdominal fat at processing. The formulation addition of the exogenous feed enzyme to diets differing in nutrient contents and energy did not affect broiler live performance or carcass traits. However, the exogenous feed enzyme decreased 14-d mortality in experiment 1 and 41-d mortality in experiment 2 but was without effect on mortality in experiment 3. Future research elucidating any benefits on mortality from the exogenous feed enzyme may aid commercial poultry producers. Further, reducing dietary nutrient levels beyond that considered in this study may allow for exogenous enzyme benefits in broiler live production and carcass traits to be observed as mediated through nutrient liberation.
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West et al. (2007) studied this question.
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