# Commission Regulation (EC) No 429/2008 of 25 April 2008 on detailed rules for the implementation of Regulation (EC) No 1831/2003 of the European Parliament and of the Council as regards the preparation and the presentation of applications and the assessment and the authorisation of feed additives (Text with EEA relevance), Division 2: Table. Animal categories: Poultry

Extent: E+W+S+N.I.

Category
Definition of the animal category
Approximate duration period (weight/age)
Minimum duration of long term studies for efficacy
Period
Age
Weight
Chickens for fattening
Birds raised for fattening
From hatching
Up to 35 days
Up to ~1 600 g(up to 2 kg)
35 days
Chickens reared for laying
Female birds being reared for consumer egg production or for breeding purposes
From hatching
Up to ~16 weeks
(up to 20 weeks)
—
112 days (if the efficacy data are not available for chickens for fattening)
Laying hens
Productive female birds held for egg production purposes
From 16-21 weeks
Up to ~13 months
(up to 18 months)
From 1 200 g (white) 1 400 g (brown)
168 days
Turkeys for fattening
Birds raised for fattening
From hatching
Up to ~14 weeks
(up to 20 weeks)
Up to ~16 weeks
(up to 24 weeks)
Hens: up to ~7 000 g
(up to 10 000 g)
Cocks: up to ~12 000 g
(up to 20 000 g)
84 days
Turkeys for breeding purposes
Female and male birds held for breeding purposes
Whole period
From 30 weeks up to ~ 60 weeks
Hens: from ~15 000 g
Cocks: from ~30 000 g
At least six months
Turkeys reared for breeding
Young female and male birds reared for breeding purposes
From hatching
Up to 30 weeks
Hens: up to ~15 000 g
Cocks: up to ~30 000 g
Whole period (if the efficacy data are not available for turkeys for fattening)

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Source: https://www.legislation.gov.uk/eur/2008/429/annex/IV/division/2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2008-429/annex-IV/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.