Production Performance and Egg Quality of Laying Hens as Influenced by Genotype and Rearing System

The aim of this study was to evaluate the effect rearing systems and genotypes on production performance egg quality. Isa Brown New Hampshire were used in study. These two housed floor organic systems. During experimental period, which lasted one year (52 weeks), following parameters recorded: production, daily mass, feed consumption, conversion efficiency, mortality. Fifteen eggs per group collected for analysis at 64 weeks hen age. samples evaluated external (egg weight shape index), internal (albumen height, Haugh unit, proportions albumen, yolk shell), eggshell quality (shell thickness, shell deformation breaking strength), eggs’ chemical composition (dry matter, minerals, protein lipids). Generally, hens had better than hens. At same time, layers performed floor-reared ones. Genotype a significant all ten (external, quality), system independently affected only weight, interaction observed factors significantly influenced seven parameters. three four parameters, while no established eggs. x genotype content.