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ARS Home » Midwest Area » Ames, Iowa » National Laboratory for Agriculture and The Environment » Agroecosystems Management Research » Research » Publications at this Location » Publication #430807
Research Project: Physiological, Microbiological, and Nutritional Mechanisms to Maintain Animal Productivity in the Absence of Antibiotics

Location: Agroecosystems Management Research

Title: The role of gut permeability in livestock: methods to study the effects of stress on gut permeability and energy consumption

Author
item Pearce, Sarah

Submitted to: Journal of Animal Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/17/2026
Publication Date: 2/19/2026
Citation: Pearce, S.C. 2026. The role of gut permeability in livestock: methods to study the effects of stress on gut permeability and energy consumption. Journal of Animal Science. https://doi.org/10.1093/af/vfag008.
DOI: https://doi.org/10.1093/af/vfag008

Interpretive Summary: Farm animals face many stressors such as extreme heat or cold, weaning, transport, disease, and dietary changes. These stressors can weaken the gut’s protective barrier, often referred to as “leaky gut.” When this barrier breaks down, animals must use more energy to fight infections and repair damage, leaving less energy available for growth and productivity. This has direct implications for U.S. agriculture priorities. Protecting gut health supports productivity and efficiency by helping animals turn feed into meat, milk, and eggs more effectively. It also advances animal welfare, since resilient animals experience less illness and stress. Strong gut barriers contribute to food safety by preventing harmful bacteria and toxins from entering the bloodstream, lowering risks that could affect the food supply. Finally, better gut health reduces reliance on antibiotics and supports sustainability, aligning with consumer demand for responsible production. Gut leakiness is measured using several different methods. In whole animals, harmless sugar or dye markers reveal how much leaks through the gut. In tissue samples, lab tests measure gut integrity and nutrient transport while newer cell models can more closely mimic real intestines. Because no single test is perfect, researchers combine methods to get a complete picture. Looking ahead, innovations such as probiotics, precision sensors, and artificial intelligence (AI) monitoring could help farmers detect gut problems early and keep animals healthier.

Technical Abstract: No technical abstract: Journal requested implications instead: Implications -Advances in animal nutrition are reshaping sustainability strategies across livestock systems. -Global demand for animal protein will continue to challenge resource efficiency. - Measuring barrier function requires multiple tools; no single “silver bullet” exists yet. -Managing gut permeability is not only a biological challenge but also an economic and welfare imperative as it is a hidden driver of livestock resilience, linking stress to productivity losses. - Future innovations from organoids to AI-driven sensors will reshape how we monitor gut health and must balance productivity with animal welfare and environmental stewardship.