Genetic parameters for production, quality, and colors from eggs in Brazilian lineages of chickens

Fátima Auler Bogdanski; Robson Mateus Freitas Silveira; Gregori Alberto Rovadoscki; Vamilton Franzo; Izally Carvalho Gervásio; Daysi Ylder Orzuza Escobar; Brayan Dias Dauria; Ariana Nascimento Meira; Luciana Mangeti Barreto Mourão; Luiz Lehmann Coutinho; Carla Cachoni Pizzolante; José Evandro de Moraes; Gerson Barreto Mourão

doi:10.1007/s11250-023-03554-y

Genetic parameters for production, quality, and colors from eggs in Brazilian lineages of chickens

Trop Anim Health Prod. 2023 Apr 5;55(3):148. doi: 10.1007/s11250-023-03554-y.

Authors

Affiliations

¹ Department of Animal Science, "Luiz de Queiroz" College Agriculture, University of São Paulo, Piracicaba, Brazil.
² Research Center of Diversified Animal Science, Instituto de Zootecnia, Nova Odessa, Brazil.
³ Department of Animal Science, "Luiz de Queiroz" College Agriculture, University of São Paulo, Piracicaba, Brazil. gbmourao@usp.br.

PMID: 37020063
DOI: 10.1007/s11250-023-03554-y

Abstract

Genetic parameters were estimated for egg production, egg quality, and eggshell colors in eight lineages of Brazilian laying hens. Age at first egg (AFE), total egg production up to the 45th week (PROD), egg weight (EW), albumen height (AH), yolk color (YC), the Haugh units (HU), eggshell strength (ESS), eggshell thickness (EST), yolk weight (YW), eggshell weight (ESW), and eggshell color (L*, a*, and b*) were measured in 2030 eggs obtained from 645 laying hens. Variance components were estimated from a mixed animal model, which included the fixed effects of contemporary groups, cage location, and hen line, and the additive genetic, permanent environmental, and residual as random effects. In general, heritabilities were low to moderate (h² = 0.11 to 0.48). Genetic correlations among eggshell quality traits were moderate to high (0.36 and 0.69). High genetic correlations were obtained between the eggshell color traits [r_g = -0.90 (L* and a*); r_g = -0.64 (L* and b*); and r_g = 0.65 (a* and b*)]. Results suggest that EW is strongly correlated with ESW, but the genetic correlations between EW and ESS and between EW and EST were low. Genetic correlations between L* and eggshell quality traits were low to moderate, suggesting that L* has little or no relation with external egg quality. However, genetic correlations between a* and b* values and eggshell quality traits were high. The genetic correlations between eggshell color and eggshell quality traits were low, suggesting that the eggshell color does not influence external egg quality. Genetic correlations between PROD and egg quality traits were negative and varied between -0.42 and -0.05. This antagonistic relationship emphasizes the importance of adopting breeding schemes that allow the simultaneous genetic progress of these traits by considering their genetic correlation and economic relevance, such as the selection index.

Keywords: Egg quality; Eggshell color; Genetic parameters; Genetic resources; Selection.

MeSH terms

Animals
Brazil
Chickens* / genetics
Cytochrome P-450 CYP2B1*
Egg Shell
Eggs
Female
Ovum

Substances

Cytochrome P-450 CYP2B1