Effect of oviposition time and age of hens on some characteristics of egg quality
Pavlovski, Z. (Institut za stocarstvo, Beograd - Zemun (Yugoslavia)) | Hopic, S. | Masic, B. | Lukic, M.
The egg mass, shell thickness and deformation, albumen quality (expressed by Haugh unit) of eggs from Isabrown hens of the same flock and in age of 32 and 52 weeks were investigated. Average egg mass of the investigated eggs form hens at the age of 32 weeks was from 57.29 to 60.47, that means considerably lower compared to the eggs from 52 week old hens (69.30 to 65.34). As expected, in all investigated time periods, older hens layed eggs of greater mass than younger hens. In the majority of investigated periods, deformation was somewhat higher in case of eggs layed by older hens, which means that the shell was thinner. In both investigation periods, morning eggs had greater shell deformation, with a tendency of reduction during the day. In the majority of investigated periods, shell thickness was higher in eggs from younger hens. Oviposition time influenced significantly the shell thickness of eggs layed by hens of both ages. Shell thickness increased linearly with the oviposition time. Number of Haugh units in all investigation periods was higher in eggs from younger hens. In can be concluded that eggs layed in the afternoon, in both investigated periods showed lower value of egg mass and number of Haugh units, but thicker shell.Show more [+] Less [-]