The relationship of shortening and strength of eggshell to some egg quality indicators and egg production in hens of different initial laying lines*

Máchal, L.; Simeonovová, Jana

doi:10.5194/aab-45-287-2002

Cited by 17 publications

(15 citation statements)

References 9 publications

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“…With advancing quail age, production decreases with an associated increase in egg weight, and shell composition and thickness also change (MÁCHAL; SIMEONOVOVÁ, 2002). The increase in egg weight ratios can be up to 20%; however, there is no proportional increase in the weight of the shell because the calcium present in the shell is distributed over a larger surface.…”

Section: Introductionmentioning

confidence: 99%

Quail performance and egg quality at the end of production fed with varying levels of calcium

Souza

Calixto

Lemos

et al. 2016

SCA

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The goal of the present study was to evaluate the influence of increasing levels of dietary calcium on performance, egg quality, and the amount of calcium retained in the meat and excreted by Japanese quails at the final production. Four hundred 46-58-week-old Japanese quails were distributed in a completely randomized design consisting of five calcium level treatments: T1 = 2.95%, T2 = 3.25%, T3 = 3.55%, T4 = 3.85% and T5 = 4.15% calcium. The performance variables included feed intake (g bird -1day -1 ), egg production (%), feed conversion by egg mass and per dozen eggs, egg mass (g), and viability. For egg quality, we assessed egg weight, percentage of albumen, yolk weight, percentage of shell, and shell thickness. We also evaluated the amount of calcium present in the meat and the amount of calcium excreted by quails. Increasing levels of calcium linearly influenced feed conversion, weight of yolk, and percentage of eggshell. Shell thickness increased up to the 3.85% calcium treatment. Calcium content of the meat differed among the quails; the quails fed the lowest level of calcium (2.95%) showed higher calcium content in meat, whereas calcium excretion increased with increasing levels of calcium in the diet. In conclusion, the addition of 3.85% of calcium in quail feed at the end of production improved eggshell quality, and maintained internal quality and performance within the recommended standards for the production phase tested in quails. Levels higher than 3.85% calcium negatively influenced the parameters analyzed. Key words: Coturnix coturnix japonica. Digestibility. Eggshell thickness. ResumoO objetivo do presente estudo foi avaliar a influência de níveis crescentes de cálcio na dieta sobre o desempenho, a qualidade do ovo, e a quantidade de cálcio retido na carne e excretado por codornas japonesas em final da produção. distribuídas em um delineamento experimental inteiramente casualizado, sendo os tratamentos constituídos de cinco níveis de cálcio: T1 = 2,95%, T2 = 3,25%, T3 = 3,55%, T4 = 3,85% e T5 = 4,15%. As variáveis de desempenho incluíam o consumo de ração (g/ave/dia), produção de ovos (%), conversão alimentar por massa de ovo e por dúzia de ovos, massa de ovo (g), e viabilidade. Para a qualidade dos ovos foram avaliados o peso dos ovos, porcentagem de albúmen, peso da gema, porcentagem de casca e espessura da casca. Também foi avaliada a quantidade de cálcio presente na carne e a quantidade de cálcio excretado pelas codornas. O aumento dos níveis de cálcio influenciou linearmente a conversão alimentar, o peso de gema e a porcentagem de casca de ovo. A espessura da casca aumentou até o nível de inclusão de 3,85% de cálcio. O teor de cálcio da carne diferiu entre as codornas; as codornas alimentadas com o menor nível de cálcio (2,95%) apresentaram maior teor de cálcio na carne, enquanto a excreção de cálcio aumentou com o aumento dos níveis de cálcio na dieta. Em conclusão, a adição de 3,85% de cálcio na alimentação de codornas no final da produção melhorou a qualidade da casca do ovo, e...

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Section: Introductionmentioning

confidence: 99%

Quail performance and egg quality at the end of production fed with varying levels of calcium

Souza

Calixto

Lemos

et al. 2016

SCA

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“…A good-quality day-old chick is hence a crucial hinge between the hatchery and farm. Pre-incubation factors such as pre-storage incubation, length of egg storage and age of breeders, as well as incubation conditions, affect day-old chick quality and subsequent bird performance (MACHAL andSIMEONOVOVA 2002, PETEK andDIKMEN 2006). Moreover, it has been reported that good hatchability does not necessarily positively correlate with a high percentage of good-quality chicks and that maximal hatchability is not always linked to the highest post hatch quality and growth of the chick (DECUYPERE and BRUGGEMAN 2007).…”

Section: Introductionmentioning

confidence: 99%

Physical chick parameters and effects on growth performance in broiler

et al. 2010

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This study was made to compare physical chick quality indicators such as chick length and feather colour and their effects on the uniformity and subsequent growth performance in broiler. For this reason; 600 day old male chicks were used. Chicks were classified into two groups on the basis of their feather colour: deep and light yellow. Then, chicks in each group were further divided into three groups as small, middle and large according to their body length. The length of the middle group animals was varied between 18.0-18.3 cm, while that of the largest group was greater than 18.3 cm and the small group was lesser than 18.0 cm. A positive correlation between chick length and chick weight was observed in all groups at the 0 day of age. Body length uniformity in day old chick was more important than body weight uniformity. Longer chicks exhibited better growth potential throughout the experiment. The feeding efficiency and survival rate of longer chicks were numerically greater compared to smaller chicks. There were no significant differences for subsequent growth parameters in feather colour groups. Consequently; length of day old chick can be used as important criteria for selection of higher quality chicks having better growth performance.

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“…The rupture force of hen eggs depends on various factors such as breeding conditions , the breed of hen (Máchal, 2002), diet , egg shape (Havlíček et al, 2008;Nedomová et al, 2009), microstructure (Severa et al, 2010a;Severa et al, 2010b), temperature (Voisey & Hamilton, 1976) and other parameters. This force also depends on loading rate.…”

Section: Introductionmentioning

confidence: 99%

Effect of Loading Rate on Hen’s Eggshell Mechanics

Trnka¹,

Buchar²,

Severa³

et al. 2012

JFR

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The study is focused on analysis of mechanical behavior of hen's eggshell expressed in terms of average rupture force and corresponding deformation. Some other physical properties such as mass, length, diameter, geometric mean diameter, surface area, sphericity, and volume were also evaluated. The egg samples were compressed along their X and Z-axes. Two different experimental methods were used: compression between two plates (loading rates 0.0167, 0.167, and 1.67 mm/s) and impact of a free-falling cylindrical bar (loading rates up to 17 mm/s). Surface displacement and surface velocity were measured using the laser-vibrometer. The increase in rupture force with loading rate was observed for loading in all direction (along main axes). Dependence of the rupture force on loading rate was quantified and described. The highest rupture force was obtained when the eggs were loaded along the X-axis. Compression along the Z-axis required the least compressive force to break the eggshells.

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The relationship of shortening and strength of eggshell to some egg quality indicators and egg production in hens of different initial laying lines*

Cited by 17 publications

References 9 publications

Quail performance and egg quality at the end of production fed with varying levels of calcium

Quail performance and egg quality at the end of production fed with varying levels of calcium

Physical chick parameters and effects on growth performance in broiler

Effect of Loading Rate on Hen’s Eggshell Mechanics

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