On the evaluation of chicken egg shape variability
2008
Havlicek, M.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Techniky a Automobilove Dopravy | Nedomova, S.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Technologie Potravin | Simeonovova, J.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Technologie Potravin | Severa, L.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Techniky a Automobilove Dopravy | Krivanek, I.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Techniky a Automobilove Dopravy
Two simple methods of measuring the variability of egg shape were analyzed in this study. In total, 250 eggs of ISA BROWN hens were examined. In the first method the most important geometrical indicators were measured and their variabilities were expressed as coefficients of variation (CV). The resulting CV were as follows: egg length 3.56%, egg maximum width 2.84%, shape index 3.80%, surface area 5.08%, and egg volume 7.23%. The second method consisted in quantitative measuring of the shape by the score of the principal components of elliptic Fourier descriptors (EFDs). The first four principle components which could explain over 99% of the egg shape variations were found to be very good measures of the monitored phenomenon. It was found out that 87.41% of the total shape variation can be accounted to the length to width ratio. The usefulness and relevance of the shape index usage was confirmed.
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