The Effect of the Type of Alternative Housing System, Genotype and Age of Laying Hens on Egg Quality

Abstract

The present study investigated the effect of the type of alternative housing system, and genotype and age of laying hens on physical traits of egg shell and contents. it was demonstrated that alternative housing system type influenced egg weight and shape, and eggshell color and yolk color intensity. Eggs from free-range system were heavier and were characterized by more intense yolk color. no effect of alternative housing system type on albumen height, value of haugh units (hu value) and presence of meat and blood spots was noted. Hen genotype had a significant effect on egg weight and eggshell color intensity in each of the alternative housing systems tested in this study. hy-line Brown hens laid heavier eggs than hens of native breeds. genotype was also observed to affect egg content traits (albumen height, hu values and presence of meat and blood spots). independently of the type of alternative housing system, most blood and meat spots were noted in eggs of hens laying brown-shelled eggs, i.e. r-11 and hy-line Brown layers. laying hen age significantly impacted on egg weight, yolk percentage, eggshell traits (color intensity, weight, thickness and strength) and egg content traits (HU value, yolk weight and color intensity, presence of meat and blood spots). Older hens laid heavier eggs with a greater yolk percentage but with thinner eggshell.

Effect of layer genotype on physical characteristics and nutritive value of organic eggs

“…Likewise, Biesiada-Drzazga et al 2014found the yolk weight and percentage content to be higher in Araucana compared to Greenleg Partridge eggs. Smaller egg weight and greater yolk percentage in eggs from native hens in contrast with commercial breeds were also reported by Simčič et al (2009) and Sokołowicz, Krawczyk, and Dykiel (2018).…”

Effect of Breed and Diet Type on the Freshness and Quality of the Eggs: A Comparison between Mos (Indigenous Galician Breed) and Isa Brown Hens

“…On the contrary, this parameter was the only one affected by type-diet treatment, with the highest value obtained for cooked yolk (15.63) in eggs from laying hens feed with CF. [10] also observed significant differences in eggshell color parameters, as native breed Greenleg Partridge and Rhode Island Red hens were compared to Hy-line Brown (commercial hybrid). Moreover, it can be also found that genotype had a significant (p < 0.05) effect on luminosity and yellowness of cooked yolk, with the former one higher in Isa Brown and latter in Mos breed.…”

Effect of Hen Oviposition Time on some Egg Characteristics

“…It's observed that the heritability of yolk characteristics was ranged between low to moderate (Alipanah et al, 2013;Rath et al, 2015;Sreenivas et al, 2013). Yolk characteristics differ between avian species (Popoola et al, 2015), breeds (Sola-Ojo & Ayorinde, 2011;Adomako et al, 2013;Bobbo et al, 2013;Abdullah & Shaker, 2018), egg storage (Dorji, 2014), rearing system (Sokolowicz et al, 2018), age (Zita et al, 2009), and physical apperence (Shaker & Aziz, 2017). This experiment was carried out to investigate the effect of oviposition time on egg external traits (egg weight, egg length, egg breadth), yolk characteristics (yolk weight, yolk high, yolk diameter, yolk index, and the proportion of yolk weight to egg whole weight), and investigate the correlations between these characteristics by using Ross 308 hybrid.…”