Quality and chemical composition of eggs affected by rearing system and hen's age

Biotechnology in Animal Husbandry

Petričević Veselin¹  Lukić Miloš¹  Škrbić Zdenka¹  Petrović Milun D.²  Bogosavljević-Bošković Snežana²  Rakonjac Simeon²  Dosković Vladimir² 

[1] Institute of Animal Husbandry, Belgrade-Zemun;University of Kragujevac, Faculty of Agronomy Čacak, Čačak;

关键词: laying hens;    rearing systems;    egg quality;    chemical composition;    hen's age;   

DOI  :  

来源: DOAJ

【 摘 要 】

The aim of this study was to evaluate the effect of rearing system and hen's age on quality and chemical composition of eggs. The tested rearing systems were: cage, floor and organic (30 birds Isa Brown hybrid per group). Fifteen eggs per group were collected for analyses in each of three phases of the productive cycle (32, 48 and 72 weeks hen's age). In these samples were investigated external (egg weight and egg shape index), internal (albumen height, Haugh unit and yolk colour) and chemical composition of eggs (dry matter, minerals, protein and lipids content). The general conclusion is that the egg weight and Roche values were increased, while egg shape index, albumen height and Haugh unit were decreased with hen's age. Organic eggs had higher albumen height and more Haugh units in the 48 and 64 weeks compared to the floor and cage eggs. Yolk colour of the floor and cage hens most dependent on the hen's age, on the other hand-yolk colour of organic hens most dependent on the grass availability at the outlet. Eggs from the organic rearing system had a lower dry matter, proteins and lipid content as compared to the cage system.

【 授权许可】

Unknown