Genetic parameters of egg defects and egg quality in layer chickens

Poultry Science
A WolcJ C M Dekkers

Abstract

Genetic parameters were estimated for egg defects, egg production, and egg quality traits. Eggs from 11,738 purebred brown-egg laying hens were classified as salable or as having one of the following defects: bloody, broken, calcium deposit, dirty, double yolk, misshapen, pee-wee, shell-less, and soft shelled. Egg quality included albumen height, egg weight, yolk weight, and puncture score. Body weight, age at sexual maturity, and egg production were also recorded. Heritability estimates of liability to defects using a threshold animal model were less than 0.1 for bloody and dirty; between 0.1 and 0.2 for pee-wee, broken, misshapen, soft shelled, and shell-less; and above 0.2 for calcium deposit and double yolk. Quality and production traits were more heritable, with estimates ranging from 0.29 (puncture score) to 0.74 (egg weight). High-producing hens had a lower frequency of egg defects. High egg weight and BW were associated with an increased frequency of double yolks, and to a lesser extent, with more shell quality defects. Estimates of genetic correlations among defect traits that were related to shell quality were positive and moderate to strong (0.24-0.73), suggesting that these could be grouped into one category or sele...Continue Reading

Citations

Mar 20, 2016·Poultry Science·M AlmH Wall
Apr 22, 2016·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Bronwyn WilloughbyJohn N Maina
Dec 12, 2018·Poultry Science·Kristen J Navara, Elizabeth R Wrobel
Apr 9, 2015·Animal : an International Journal of Animal Bioscience·D NarincT Aksoy
Nov 19, 2014·Journal of Animal Science·J P ThirstrupJ Jensen
May 29, 2020·The Journal of Poultry Science·Gordana KralikZlata Kralik
Jan 9, 2021·Animal Science Journal = Nihon Chikusan Gakkaihō·Tatsuhiko GotoDaichi Ijiri
Jul 12, 2021·Animal : an International Journal of Animal Bioscience·J GautronI C Dunn

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