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Feeding Horses Before Exercise: What to Feed and When?

Three experiments were conducted to evaluate if feeding hay with and without grain affects glycemic response and hematological responses in Thoroughbred horses at rest and during a simulated competition exercise test on a high-speed treadmill. The first experiment evaluated how feeding forage along with grain influences plasma variables and water intake. The second experiment was conducted to determine whether these changes affect exercise performance. The third experiment was conducted to determine how forage alone affects exercise response.

Results showed that time of hay feeding affects glycemic response, plasma protein, and water intake post grain feeding. Free-choice hay feeding resulted in a 9% reduction in plasma volume. Fasted horses had lower blood lactate after exercise compared to the grain fed treatments. Heart rate was significantly different between treatments. Feeding only forage before exercise had a much smaller effect on glycemic and insulin response to exercise than a grain meal. Forage did not affect free fatty acid availability.

Source:Equinews

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Validating Net Energy in Commercial Swine Systems - Gustavo Lima

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In this episode of The Swine Nutrition Blackbelt Podcast, Gustavo Lima, PhD candidate at Iowa State University, explains how soybean meal net energy is evaluated using growth assays and calorimetry. He discusses caloric efficiency, validation under commercial conditions, and differences between controlled and real-world environments. Gustavo also highlights practical implications for diet formulation and ingredient valuation. Listen now on all major platforms!

“Indirect calorimetry provides a precise estimation of ingredient energy, yet validation under production conditions remains essential for accurate application in real systems.”

Meet the guest: Gustavo Lima / gustavo-lima-a9867127 is a PhD candidate in Animal Science at Iowa State University, specializing in swine nutrition, ingredient evaluation, and energy metabolism. With over 15 years of experience across Latin America, his work focuses on soybean meal utilization, caloric efficiency, and applied research for commercial production systems.