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Physiological stress in broilers: Ramifications on nutrient digestibility and responses^1,2

Department of Poultry Science, Mississippi State University, Mississippi State 39762

³ Corresponding author: mkidd{at}poultry.msstate.edu

Physiological stress is one of many concerns facing the modern broiler producer. Research has yet to reveal mechanisms that would allow the producer to efficiently minimize the detrimental impacts of physiological stress on broiler performance. One possible approach for improvement in this area is to elucidate the effects of different nutrient regimens on stressed broilers. Sufficient prior knowledge of the effects of stress on metabolism and nutrient digestibility, as well as effective stress induction models, is essential to any researcher interested in delineating the effects of nutrients on stressed broilers. This review examines the physiological mechanisms that activate and control stress, as well as the effects of stress on immunity, metabolism, and broiler performance. Validation procedures for stress induction models are also examined. Additionally, this review examines available research focused on amino acid digest-libility in the presence of stress, digestibility assays necessary for this research, and nutrients that have been shown to have the potential for stress reduction or amelioration.

Key Words: physiological stress • broiler • amino acid digestibility

¹ This is Journal Article Number J-11143 from the Mississippi Agricultural and Forestry Experiment Station, supported by MIS-322230.

² Use of trade names in this publication does not imply endorsement by the Mississippi Agricultural and Forestry Experiment Station of the products, or of similar ones not mentioned.