|Dozier iii, William|
Submitted to: Journal of Applied Poultry Research
Publication Type: Peer reviewed journal
Publication Acceptance Date: 12/15/2006
Publication Date: 9/15/2007
Citation: West, M.L., Corzo, A., Dozier III, W.A., Blair, M.E., Kidd, M.T. 2007. Assessment of dietary rivabio excel in practical u.s. broiler diets. Journal of Applied Poultry Research. 16:313-321. Interpretive Summary: Feed cost represents 65% of the total live production cost for broiler chickens that supports an industry that produces 8 billion birds annually. Recent trends in energy prices in the U.S have raised public awareness concerning alternative energy sources. As biofuel production increases, commodity pricing of corn and soybean meal for poultry feed will increase due to supply and demand. Feed enzymes can be used to liberate additional energy that is not available to the bird from corn and soybean meal. Research is sparse on effects of a feed enzyme Rovabio supplemented to broiler diets. This study found that the addition of Rovabio did not improve growth, feed conversion, and carcass traits but did reduce the incidence of early mortality.
Technical Abstract: 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 U. S. 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 impact broiler live performance or carcass traits. However, the exogenous feed enzyme decreased 14 d mortality in Experiment 1, 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 would aid formulation practices for 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.