# ISO 13904:2005 — Withdrawn and superseded ISO standards

For ISO 13904:2005, item title is Animal feeding stuffs — Determination of tryptophan content; status code is 9599; successor is ISO 13904:2016; withdrawn / published date is 2005-05-11, recorded from its source on 2026-08-05.

- **Identifier:** ISO 13904:2005 _(verified: appears in the quote below)_
- **Item title:** Animal feeding stuffs — Determination of tryptophan content _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 13904:2016
- **Withdrawn / published date:** 2005-05-11 _(verified: appears in the quote below)_

## What the source says

> 37259,IS,,ISO 13904:2005,Animal feeding stuffs — Determination of tryptophan content,Aliments des animaux — Dosage du tryptophane,2005-05-11,1,['65.120'],ISO/TC 34/SC 10,9599,,[59955],"['en','fr']",9,"<p>ISO 13904:2005 describes the determination of the total and free tryptophan in feeding stuffs (e.g. complete and complementary feeds, supplementary feeds, raw materials, ingredients, premixtures and concentrates. It does not distinguish between D- and L-forms.</p>"

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).