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) (c. 429)

ANNEX IV U.K. Categories and definitions of target animals and indication of the minimum duration of efficacy studies

2. Table. Animal categories: Poultry U.K.

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)