One-generation divergent selection on large and small yolk proportions in a White Leghorn line

Hartmann, C.; Johansson, Kjell; Strandberg, E.; Wilhelmson, Martin

doi:10.1080/713654930

Cited by 44 publications

(30 citation statements)

References 21 publications

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“…In contrast, Leyendecker et al (2001b) showed significantly higher yolk weight in white egg chickens (Lohmann LSL) in comparison with the brown Lohmann Tradition. Heritability of the yolk weight is 0.45 (Zhang et al 2005), 0.22 (Hartmann et al 2000). From albumen quality characteristics only Haugh Units were influenced by genotype (Tůmová et al 2007).…”

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confidence: 95%

“…Zhang et al (2005) showed that heritability of Haugh Units is 0.41 and for albumen weight 0.59. However, Hartmann et al (2000) found 0.41 for albumen weight. The genetic correlation between yolk percentage and yolk weight was 0.52, whereas the genetic correlations with egg weight and albumen weight were -0.51 and -0.74, respectively (Hartmann et al 2000).…”

mentioning

confidence: 97%

“…However, Hartmann et al (2000) found 0.41 for albumen weight. The genetic correlation between yolk percentage and yolk weight was 0.52, whereas the genetic correlations with egg weight and albumen weight were -0.51 and -0.74, respectively (Hartmann et al 2000). With higher egg weight, the average albumen percentage increased (Arent et al 1997).…”

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confidence: 97%

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Effects of Genotype, Age and Their Interaction on Egg Quality in Brown-Egg Laying Hens

2009

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The experiment compared the effects of strain and age on egg quality characteristics in ISA Brown, Hisex Brown and Moravia BSL brown-egg laying hens. One hundred and eight ISA Brown hens, forty-five Hisex Brown and forty-five Moravia BSL 20 to 60 weeks old were housed in conventional cages (550 cm 2 per hen). Feed and water were available ad libitum. Eggs were sampled at 21-day intervals, every collecting week 150 eggs per genotype in three age periods, from 20 to 26 weeks, 37 to 43 weeks and 54 to 60 weeks of age. A total of 4,050 eggs were examined. Egg quality characteristics were affected by genotype and age. Egg weight, yolk weight and percentage, Haugh Units increased with the hens' age in all genotypes, but albumen and eggshell percentage decreased, eggshell thickness and strength improved with age. The highest egg weight (65.3 g) and yolk quality (yolk index 45.1%) were found in Moravia BSL at the end of the experiment. In contrast, the best albumen quality (albumen percentage 60.0) values were in Hisex Brown and the eggshell quality measurements (eggshell thickness 0.38 mm) were higher in ISA Brown. -egg layers, strain, ISA Brown, Hisex Brown, Moravia BSL, age, yolk, albumen, shell quality, correlation Brown

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Effects of Genotype, Age and Their Interaction on Egg Quality in Brown-Egg Laying Hens

2009

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“…Commercially available genotypes produce eggs of different weights, thus the weights of components and their proportions presumably also vary (Johnston and Gous, 2007). Notwithstanding, Hartmann et al (2000) revealed Interaction between housing system and genotype in relation to internal and external egg quality parameters E. Tůmová 1 , M. Englmaierová 2 , Z. Ledvinka 1 , V. Charvátová the negative genetic correlations between egg quality and genotype. Main deviations in egg composition, egg weight and eggshell quality are between brown and white hybrids (Halaj and Grof ík, 1994;Heil and Hartmann, 1997;Tůmová et al, 2007;Singh et al, 2009).…”

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Interaction between housing system and genotype in relation to internal and external egg quality parameters

Tůmová¹,

Englmaierová²,

Ledvinka³

et al. 2011

CZECH J ANIM SCI

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ABSTRACT:The effect of three housing systems (conventional cages, enriched cages and litter) on egg quality parameters was evaluated in two experiments with four brown laying strains ISA Brown, Hisex Brown, Bovans Brown and Moravia BSL. During 40 weeks of lay the total number of 7200 eggs was produced and analysed for egg weight, egg component weight and eggshell quality indicators. In 60 eggs, pore density in the small-end, large-end and equatorial areas was determined. Significant interactions between genotype and housing were found out in egg weight (P ≤ 0.001), yolk and albumen weight (P ≤ 0.001) and yolk colour (P ≤ 0.001). Haugh units were the highest in eggs laid in cages and the lowest in the ISA Brown strain. Eggshell quality indicators were affected more by genotype than by housing. The interaction between genotype and housing was not significant for eggshell thickness but it was significant for eggshell weight and strength. Although eggshell thickness was lower in eggs produced in cages, eggshell strength was higher. A significant negative correlation was found out between pore density and housing system. Results of the study suggest that the ability of a strain to produce eggs of high quality in a particular housing system should be considered, even within brown strains.

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“…Egg weight is one of the most important characteristics because each of the components of the egg depends on egg weight (Romanoff and Romanoff, 1949;Hussein et al, 1993;Hartmann et al, 2000). The proportion of yolk is negatively related to egg size but positively associated with hen's age (Hartmann et al, 2000;Johnston and Gous, 2007a).…”

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The effect of genotype, housing system and egg collection time on egg quality in egg type hens

Tůmová¹,

Skřivan²,

Englmaierová³

et al. 2009

CZECH J ANIM SCI

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ABSTRACT:The effect of egg collection time, genotype and housing system on egg quality characteristics was evaluated in an experiment with laying hens of ISA Brown, Hisex Brown and Moravia housed on litter and in conventional cages. The experiment was conducted from 20 to 64 weeks of age. Eggs were collected and recorded daily at 06:00, 10:00 and 14:00 h. Once every four weeks, two days in row, all eggs laid from each pen or cage at each oviposition time were used for egg quality analyses (total 1 694 eggs). Egg collection time was dependent on genotype. Significantly more eggs were laid at 06:00h by ISA Brown while Moravia laid eggs mainly at 10:00 and 14:00 h. Housing on litter postponed the time of oviposition. The highest egg weight (62.09 g) was recorded in Hisex Brown genotype placed in cages and at 06.00 h. Interactions of all factors were determined also in Haugh units (P ≤ 0.041). Eggshell strength was affected by housing system, genotype and egg collection time (P ≤ 0.049). It was higher in cages than on litter, and lower in the Moravia genotype in comparison with the other two strains.

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One-generation divergent selection on large and small yolk proportions in a White Leghorn line

Cited by 44 publications

References 21 publications

Effects of Genotype, Age and Their Interaction on Egg Quality in Brown-Egg Laying Hens

Effects of Genotype, Age and Their Interaction on Egg Quality in Brown-Egg Laying Hens

Interaction between housing system and genotype in relation to internal and external egg quality parameters

The effect of genotype, housing system and egg collection time on egg quality in egg type hens

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