General Commentary ARTICLE
Response to commentary on “Examples of overlooking common sense solutions: the domestication gene and selection against mortality”
- 1Animal Breeding and Genomics Centre, Wageningen University, Wageningen, Netherlands
- 2Department of Animal Sciences, Purdue University, West Lafayette, IN, USA
by Van Rooijen, J. (2014). Front. Genet. 5:266. doi: 10.3389/fgene.2014.00266
In a commentary in Frontiers, Van Rooijen (2014) states: “Today the developments in genetics are exciting. Perhaps this explains why geneticists sometimes seem to overlook common sense solutions. One example of this is the selection experiment done by Bijma et al. (2007a,b). ……As a result their selection seemed not very efficient.” In those two papers, however, we do not report a selection experiment. The first paper presents general quantitative genetic theory, showing how interactions among individuals alter heritable variation in traits, and how this can affect response to selection. The second paper presents general methodology to estimate the quantitative genetic parameters for such traits, and illustrates this methodology using a population of laying hens showing high mortality due to pecking behavior. Neither of those papers report results of a selection experiment.
For the specific case of feather pecking, Van Rooijen suggests that the methodology would rest on the assumption that feather pecking results from aggression. This is not true. The strength of the methodology is that it captures the full heritable variance in the trait, irrespective of the underlying mechanism. Hence, for mortality due to pecking, the method captures both the actor component originating from the individual performing the pecking behavior and the victim component, as well as their covariance. These components are identified statistically from the covariances between trait values of relatives and their social partners, without any assumption on the underlying mechanisms. The method produces optimal breeding values, given the genetic parameters. Results of selection experiments based on the theory, presented in other papers (Muir, 1996; Muir et al., 2013; Ellen et al., 2014), confirm the efficiency of the proposed methodology.
Conflict of Interest Statement
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Bijma, P., Muir, W. M., Ellen, E. D., Wolf, J. B., and van Arendonk, J. A. M. (2007b). Multilevel selection 2. Estimating the genetic parameters determining inheritance and response to selection. Genetics 175, 289–299. doi: 10.1534/genetics.106.062729
Bijma, P., Muir, W. M., and van Arendonk, J. A. M. (2007a). Multilevel selection 1. Quantitative genetics of inheritance and response to selection. Genetics 175, 277–288. doi: 10.1534/genetics.106.062711
Ellen, E. D., Visscher, J., and Bijma, P. (2014). “Comparison of empirical and theoretical responses to selection against mortality due to cannibalism in layers,” in Proceedings of the 10th World Congress of Genetics Applied to Livestock Production (Vancouver, BC). Abstract nr. 317.
Muir, W., Bijma, P., and Schinckel, A. (2013). Multilevel selection with kin and non-kin groups, experimental results with Japanese quail (Coturnix japonica). Evolution 67, 1598–1606. doi: 10.1111/evo.12062
Keywords: indirect genetic effects, animal welfare, laying hens, cannibalism, quantitative genetics, breeding
Citation: Bijma P, Muir WM and Ellen ED (2014) Response to commentary on “Examples of overlooking common sense solutions: the domestication gene and selection against mortality.” Front. Genet. 5:343. doi: 10.3389/fgene.2014.00343
Received: 28 August 2014; Accepted: 12 September 2014;
Published online: 30 September 2014.
Edited by:Wendy Mercedes Rauw, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Spain
Reviewed by:Wendy Mercedes Rauw, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Spain
Simon Turner, Scotland's Rural College, UK
Copyright © 2014 Bijma, Muir and Ellen. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.