Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(5), 69-74 | DOI: 10.11118/actaun200856050069

Hodnocení variability tvarů slepičích vajec

Miroslav Havlíček1, Šárka Nedomová2, Jana Simeonovová2, Libor Severa1, Ivo Křivánek1
1 Ústav techniky a automobilové dopravy, Mendelova univerzita v Brně, Zemědělská 1, 613 00 Brno, Česká republika
2 Ústav technologie potravin, Mendelova zemědělská a lesnická univerzita v Brně, Zemědělská 1, 613 00 Brno, Česká republika

Pro popis tvaru slepičích vajec byly vytvořeny velice přesné modely. Jejich použití je ovšem podmíněno komplikovaným měřením a výpočty. V předkládané práci jsou hodnoceny dvě relativně jednoduché metody, jejichž pomocí je možno hodnotit variabilitu tvarů vajec. Zkoumáno bylo celkem 250 kusů vajec plemene Isa Brown. Byly změřeny a vypočteny základní geometrické parametry. Korelační analýza potvrdila možnost aproximace výpočtových koeficientů ks s možností uspokojivých výsledků při výpočtu plochy povrchu a objemu vajec. Dále byly vyjádřeny variační koeficienty měřených a vypočtených hodnot, které měly následující hodnoty: délka vajec 3,56 %, maximální šířka vajec 2,84 %, index tvaru 3,80 %, plocha povrchu 5,08 % a objem 7,23 %. Druhá metoda spočívala v kvantitativním hodnocení tvaru vajec pomocí vyjádření hlavních komponent eliptické Fourierovy analýzy. Pro získání vstupních dat byly použity digitální fotografie vajec. První čtyři Fourierovy deskriptory zahrnují více než 99 % variability tvaru vajec a jsou tak vynikajícím nástrojem pro popis a hodnocení sledovaného fenoménu. Bylo zjištěno, že více než 87 % celkové variability tvaru je možno vysvětlit pomocí poměru délky a šířky.

slepičí vejce, variabilita tvarů, eliptická Fourierova analýza

On the evaluation of chicken egg shape variability

Although recently reported models for determining egg shape are highly accurate, certain complicated measurements or computations are to be performed. Thus relatively simple and attainable analysis methods of chicken egg shape variability were chosen and used for the purpose of presented research. Sample of 250 eggs of ISA BROWN strain was examined. Geometrical parameters were measured and calculated with following expression of their coefficient of variation - namely 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 shape quantitative measuring by the score of the principal components of elliptic Fourier descriptors (EFDs). The first four principles 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 that 87.41 % of the total shape variation can be accounted to length to width ratio. Usefulness and relevance of the shape index usage was confirmed.

Keywords: chicken egg, shape variability, elliptic Fourier analysis
Grants and funding:

The research has been supported by the Grant Agency of the Czech Academy of Sciences under Contract No. IAA201990701.

Received: April 17, 2008; Published: November 3, 2014  Show citation

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Havlíček, M., Nedomová, Š., Simeonovová, J., Severa, L., & Křivánek, I. (2008). On the evaluation of chicken egg shape variability. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 56(5), 69-74. doi: 10.11118/actaun200856050069
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