Evaluation of strength and nondestructive deformation of eggs in hens of Rhode Island White and White Leghorn breeds by prototypes of electronic instruments
1995
Simeonovova, J. | Kalova, J. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic)) | Vyslouzil, J. | Jerabek, S.
The qualitative characteristic of eggshell and correlations between them were evaluated in laying breeds of the hens Rhode Island White (RIW) and White Leghorn (WL). In this study the electronic instrument for a destructive measuring of eggshell strength was tested. The method of measurement is based on accurate and rapid determination of force which causes eggshell destruction. The following parameters were recorded: weight of eggs, non-destructive deformation of eggshell, absolute and relative weight of eggshell, its thickness and eggshel strength. There was a significant difference between both breeds in all traits under study (P0.01). The weight of eggs was higher in hens of WL breed nearly by 6 g, and the deviation of eggshell deformation (which was negatively correlated with the resistance) was lower by 6.4 micro m. Both absolute and relative weight of eggshells were higher in layers of WL breed as well as the strength of shell and thickness of eggshell.
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