Eggshell and Bone Quality in Two Different Genetic Groups of Aged Layer Breeders

Abstract

The present study was conducted on pair aged commercial laying breeder strains (Hy-Line Brown and Hy-Line W-36) to evaluate genetic differences of eggshell and bone quality. In addition, egg production performance, mortality rate, internal organs and reproductive measurements were determined. Correlation coefficients among some eggshell and bone traits were calculated. White layer breeder hens had significantly higher percentages of hen-day and hen-housed egg production compared to the brown one. Brown Hy-Line layer breeder strain had better eggshell quality compared to W-36 Hy-Line layer breeder strain. The white layer breeder strain had a significantly higher relative oviduct weight compared to the brown one. Brown layer breeder strain recorded the higher humerus width in comparison with the white one. Tibia bone weight of brown layer breeder strain was significantly heavier by 22.87% as compared to the white strain. Moreover, the brown breeder strain recorded the higher figure of tibia width, thickness, and strength. In conclusion, at the end of the laying cycle, brown Hy-Line layer breeder strain exhibited better eggshell quality, body weight and tibia bone quality than those of W-36 breeder strain. Positive correlation coefficients were detected between humerus bone strength and both eggshell thickness and strength in brown and white strains.

Effect of strain and generation on productive performance for Baladi and Fayoumi chickens

“…The significant improve of the hen housed egg production in Fayoumi chicken strain may be due to decrease mortality rate compared with Baladi chicken strain. These results are in agreement with the findings of Rayan et al, (2020) who found a significant (P≤0.0001) higher effect on hen housed egg production for Hy-Line White-36 compared with those in Hy-Line Brown chickens. On the other hand, In contrast, Hosny (2016) who showed that no significant difference on hen housed egg production between Gimmizah and Golden Montazah chicken strains during period 20-36 weeks of age.…”

Influence of Nutrition and Genetics on Bone Parameters of 1940 Leghorn and 2016 Commercial White Leghorns

“…In chickens, there has been a positive correlation between bone-breaking force (r = 0.58 to 0.68; P < 0.001) and bone ash weight (r = 0.73 to 0.99; P < 0.001) with bone mineralization as determined through utilization of the DEXA [18]. The humerus representing the wing, has one of the greatest fracture rates of all bones [19] and had a lower total bone mineral density measurement when compared to the humerus in this current study. According to Jendral MJ, et al [20], the lower total BMD likely reflects excessive bone mineral loss by birds whose movements were highly restricted due to heavier size, however, in this current study, the results contradicted those claims due to insignificance of humerus BMD of both strains in identical cage systems.…”

Influence of strain and flock age on geometrical and mechanical attributes of eggs produced from Japanese quail birds

“…It is well known that both internal and external egg quality traits are quite deteriorated by flock age in poultry species (Akyurek & Okur, 2009; Kokoszyñski et al, 2007; Nowaczewski et al, 2010; Rayan et al, 2020). Moreover, eggs with hair cracks cause serious health problem to human being and become a source of microbial pollution.…”