2008 Savremena poljoprivreda 57 1-2.indd - Poljoprivredni fakultet ...

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THE INFLUENCE OF GENOTYPE AND AGE OF HENS
ON THE EGG SHELL QUALITY
VERA RAJICIC, SRETEN MITROVIC, NATASA TOLIMIR, LIDIJA PERIĆ
Summary
In this paper the results of examination of eggs quality in two light line hybrids of
chickens (Hisex Brown and Shaver 579) are presented. At the end of every four-week period
an examination of external and internal qualities of eggs was carried out. The examination
was carried out on the sample of 30 eggs for each hybrid. There were total of
ten examinations. For every egg we examined following external quality traits: color, deformation
and cleanliness of eggshell. From internal qualities we measured mass of raw
shell and thickness of eggshell. Concerning external qualities of eggs, the layers of Hisex
Brown had somewhat darker color of eggshell. The layers of Shaver 579 had somewhat bigger
deformation of eggshell and clearer eggshell. The chicken of provenience Shaver 579
had better internal qualitie of eggs, as well as mass of raw shell and thickness of eggshell.
High degree of correspondence and statistically very signifi cant correlation was found
between age and mass of an eggshell and age and thickness of eggshell in Shaver 579. Generally,
the both examined hybrids gave satisfying results of external and internal qualities
of eggs. For most of monitored qualities we determined strong or middle strong correlation
dependence between age and examined qualities.
Key words: genotype, age, egg, quality of eggshell