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Feed testing is probably one of the more important things you can do for your cows

Producers taking part in the Foraging into the Future Conference were reminded about the importance of feed testing. 

The nutrient content of feed will vary from year to year, field to field, species, climate conditions, fertilization, stage of maturity
when it was cut and processed, as well as storage management.

In order to balance rations for livestock it's key to know exactly what you're working with.

Livestock and Feed Extension Specialist Adriane Good says this is where a feed test can help.

"When we look at feed tests the things you're going to look for are crude protein and energy. There's a lot of different ways energy is measured, probably the easiest one for the average producer is total digestible nutrients (TDN). Then you're going to take a look at vitamins and minerals. Vitamins aren't going to be present on a feed test, but a lot of the minerals are. We just want to make sure we've got enough minerals, but also not too much of some."

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Validating Net Energy in Commercial Swine Systems - Gustavo Lima

Video: Validating Net Energy in Commercial Swine Systems - Gustavo Lima


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.