GB/T 6433-2025: Determination of crude fat in feeds

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Scope

This document describes the Soxhlet extraction and filter bag methods for the
determination of crude fat in feeds.
This document applies to the determination of crude fat in compound feeds,
concentrated feeds, concentrate supplements, and feed ingredients (except algae and its
processed products).
To ensure the effectiveness of crude fat determination in this document, feeds are
divided into the following two categories, and Category B products need to be
hydrolyzed before extraction.
Category B.
- animal-derived feed ingredients, including dairy products;
- plant-derived feed ingredients from which fats cannot be extracted without prior
hydrolysis, such as gluten, yeast, soya and potato proteins, as well as heat-treated
feed ingredients and feed products;
- compound feeds, concentrated feeds, and concentrate supplements that use animal-
derived feed ingredients and/or plant-derived feed ingredients from which fats
cannot be extracted without prior hydrolysis, where at least 20 % of the crude fat
comes from these feed ingredients.
Category A.
- compound feeds, concentrated feeds, concentrate supplements, and feed
ingredients other than category B.

Basic Data

Standard ID	GB/T 6433-2025 (GB/T6433-2025)
Description (Translated English)	Determination of crude fat in feeds
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	B46
Classification of International Standard	65.120
Word Count Estimation	10,166
Date of Issue	2025-01-24
Date of Implementation	2025-08-01
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration