EFFECTS OF PULLET-STOCKING DENSITY AND POSITION ON PERFORMANCE OF LAYING HENS FROM DIFFERENT GENOTYPES Bozkurt, Z Bayram, İ Gücüyener, Ö Lenger, Ö.F. Need analysis.
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Bozkurt, Z Bayram, İ Gücüyener, ÖLenger, Ö.F
In Europe, despite of the strict legal regulations that banning traditional cage systems (in 2012, 999/74/EC) and allowing hen egg production in alternative systems such as enriched cages, aviary, free-range or organic, it appears, in near future, that hens will be kept under conditions which enable them to show all behaviour in their natural behaviour repertoire and make them to be confined at various levels
1. laying performance was increased in line with increased cage density and higher cage level during rearing period.
2. Genotype has been found to have an important effect on sexual maturity age
3. During the growing period the cage density did not affect to the sexual maturity of the birds.
4. The position of the rearing cage in the battery did not have an important impact on the sexual maturity of the hens
5. While pullet-stocking density increased the mortality rate of egg production phase decreased
7. When the position of the growing cage in the battery changed from top to the bottom tiers the hens’ body weight increased. Hens from the white egg genotype were more effected by the cage position.
8. The egg weight of hens originating from white egg genotypes increased as the pullet-cage density increased while it decreased for hens of brown egg genotype.
10. While light and medium weight genotype hens benefited from rearing in high density cages, heavy genotype hens were adversely effect to some extent, hens from lively and active disposition genotypes were adversely affected in top and bottom level cages.