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2025-10-22T11:07:35Z urn:hdl:20.500.12327/4564 Genetic Parameters for Egg Number, Egg Weight, and Eggshell Color in Three Catalan Poultry Breeds Francesch, A. Estany, J. Alfonso, L. Iglesias, M. Producció Animal Genètica i Millora Animal Heritabilities for egg number, egg weight, and eggshell color (percentage light absorbance) at 39 wk of age, and the genetic correlations between them were estimated by restricted maximum likelihood in three Catalan poultry breeds: Penedesenca Negra (PN), Prat Lleonada (PL), and Empordanesa Roja (ER). Additive genetic differences between these breeds were also estimated. Data were from the IRTA Poultry Genetic Conservation Program and consisted of records from 1,309 PN, 1,466 PL, and 1,440 ER hens, which were obtained from 80 contemporary batches per breed hatched between 1987 and 1992. Estimates of heritability for egg number, egg weight, and eggshell color were, 0.20, 0.59, and 0.49 for PN, 0.31, 0.48, and 0.53 for PL; and 0.33, 0.50, and 0.27 for ER. Estimated genetic correlations between egg number and egg weight, egg number and shell color, and egg weight and shell color were, for PN, –0.22, –0.03, and 0.00; for PL, –0.21, –0.06, and 0.09; and –0.19, –0.29, and 0.30 for ER. Heritability for eggshell color and genetic correlation between eggshell color and other traits showed a different genetic pattern in ER breed. Significant additive genetic differences (P < 0.05) were found between ER and PN base populations for egg number (3.89), egg weight (0.91), and eggshell color (–3.50); and between ER and PL for egg number (6.69) and eggshell color (35.39). The PN and PL breeds differed significantly (P < 0.05) for eggshell color (38.22), which was darker in PN. These results could be taken as the expected genetic differences for these breeds 2025-10-22T11:07:35Z 2025-10-22T11:07:35Z 1997-12-01 info:eu-repo/semantics/article Francesch, A, J Estany, L Alfonso, and M Iglesias. 1997. “Genetic Parameters for Egg Number, Egg Weight, and Eggshell Color in Three Catalan Poultry Breeds.” Poultry Science 76 (12): 1627-1631. doi: 10.1093/ps/76.12.1627 0032-5791 http://hdl.handle.net/20.500.12327/4564 https://doi.org/10.1093/ps/76.12.1627 eng Poultry Science http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 International Elsevier