J. Appl. Poult. Res.
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J APPL POULT RES 2007. 16:13-21
© 2007 Poultry Science Association
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Research Reports

Nutrient Composition and Digestibility of Organic Broiler Diets and Pasture Forages

N. P. Buchanan, J. M. Hott, L. B. Kimbler and J. S. Moritz1

Division of Animal and Nutritional Sciences, West Virginia University, Morgantown 26506

Correspondence: 1 Corresponding author: Joe.Moritz{at}mail.wvu.edu

Poultry diets are formulated based on requirements of birds reared without access to pasture. Consumer demand for organic and free-range poultry has resulted in an increase in the use of certified organic feed. Organic poultry may have the opportunity to utilize nutrients found in forage. The addition of exogenous enzymes and manipulation of cecal microbial populations may affect the utilization of forage nutrients. The objectives of this study were as follows: 1) to determine AMEn and TMEn of organic grower diets with or without nonstarch polysaccharide enzyme supplementation and compare these values to a conventional grower diet, 2) to determine AMEn, TMEn, and true amino acid digestibility (TAAD) of forage samples with or without nonstarch polysaccharide enzyme supplementation, and 3) to determine if cecum modification affects forage AMEn, TMEn, and TAAD. The experiment was conducted using cecectomized, intact, and intact grass-fed roosters as models. Enzyme supplementation increased AMEn and TMEn values for organic feeds but not forage. Bird type had no effect on AMEn and TMEn for any treatment. The TAAD of forage was not significantly affected by enzyme supplementation. However, trends in bird type effect were observed for several amino acids.

Key Words: broiler • nutrient • forage • nonstarch polysaccharide






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