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Journal of Animal Science, Vol 70, Issue 10 2986-2993, Copyright © 1992 by American Society of Animal Science

JOURNAL ARTICLE

Divergent selection for immune responsiveness in chickens: estimation of realized heritability with an animal model

M. H. Pinard, J. A. van Arendonk, M. G. Nieuwland and A. J. van der Zijpp
Department of Animal Husbandry, Wageningen Agricultural University, The Netherlands.

With the aim of improving general disease resistance, chickens were divergently selected for their antibody titers 5 d after immunization with sheep red blood cells for nine generations. Selected and control lines differed significantly for primary and secondary responses after three generations. Heritability of the antibody titer was estimated by REML fitting an animal model using a derivative-free algorithm. The heritability estimate using data on all lines simultaneously was .31. Realized heritability of the antibody titer in the selected lines was estimated by using either the phenotypic cumulative response as the deviation from the control line or the mean breeding values obtained with an animal model. Values from the two methods were consistent, giving a realized heritability of .21 and .25 in the high and low lines, respectively. The genetic trend was not linear and the response to selection tended to accelerate over generations.


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Copyright © 1992 by the American Society of Animal Science.