Feeding trial

A feeding trial is a controlled protocol in which a finished food is actually fed to live animals, under a standardised procedure, to confirm that it supports them nutritionally rather than relying solely on a calculation of its [nutritional adequacy statement](/glossary/nutritional-adequacy-statement). In the US system this is one of the two recognised ways to substantiate a [complete food](/glossary/complete-food) under [AAFCO](/glossary/aafco) rules, the other being formulation to meet the published nutrient profile on paper (AAFCO, 2024). The trial route is generally regarded as the more demanding evidence because it tests the diet as eaten, capturing real-world digestibility and palatability that a spreadsheet cannot. A concrete detail many readers find surprising is how modest the AAFCO minimum cohorts are: a standard adult maintenance protocol requires only a small group of animals fed the diet as their sole nutrition for 26 weeks, with defined health and blood-value checks. That is enough to flag gross inadequacy but is not a long-term safety study, which is why a feeding-trial claim is a floor rather than a guarantee of optimal long-term nutrition. Premium and veterinary-oriented brands often invest in trials, and some go beyond the minimum, so the presence of trial-based substantiation can be a genuine quality signal when comparing diets. In the EU there is no identical mandatory trial system, with [FEDIAF](/glossary/fediaf) guidelines leaning on formulation to verified nutrient levels. See the [Petipedia glossary](/glossary) for how adequacy is proven across regions.

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