Heritability of egg production in laying hens under cumulative, multitrait and repeated measurement animal models

A. Wolc, M. Lisowski and T. Szwaczkowski
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A. Wolc: Department of Genetics and Animal Breeding, Agricultural University of Poznan, Poland
M. Lisowski: Poultry Research Branch at Zakrzewo, National Research Institute of Animal Production, Poland
T. Szwaczkowski: Department of Genetics and Animal Breeding, Agricultural University of Poznan, Poland

Czech Journal of Animal Science, 2007, vol. 52, issue 8, 254-260

Abstract: Six generations of three layer lines (13 770 recorded individuals of A22 line, 13 950 of A88, 9 351 of K66) were used to estimate genetic effects on egg production under cumulative, multitrait and repeatability models. Variance components were estimated by the AI-REML algorithm. The heritability of cumulative records ranged from 0.08 to 0.1. For the repeated measurements model the following genetic parameters were obtained: heritability 0.02-0.03, repeatability 0.04-0.38. The first two months of egg production were found to differ from the other periods: heritability was relatively high (h2 > 0.35) and low or negative correlations with the other periods were found. Heritability was low (h2 < 0.1) from the peak production until the end of recording and the consecutive periods were highly correlated. Further studies on monthly records are suggested.

Keywords: egg production; laying hens; cumulative model; monthly records (search for similar items in EconPapers)
Date: 2007
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjs:v:52:y:2007:i:8:id:2282-cjas

DOI: 10.17221/2282-CJAS

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