Deterministic modelling of a poultry breeding scheme Deterministic modeling of selection schemes consists of calculating the expected genetic gain after a selection process. Consequences of selection on the genetic trend are calculated using equations based on estimated breeding values and on parameters describing the population and the selection process. Professionals could use this tool to compare different strategies for the improvement of their selection schemes. In this study, the model is based on a layer chicken breeding scheme. Breeding goal includes numerous traits such as laying performances, egg quality and body weight. This is a two steps model combining a familial selection process and an individual one. Within selected families, candidates from the good families are undergoing a mass selection whereas candidates from medium families are undergoing a within family selection of a fixed number of candidates. The model requires a large number of parameters: number of candidates, proportions of selected families and selected candidates per family, accuracy of breeding values, genetic correlations between traits, weights of traits in the selection index. The variability of the parameters composing the model enables comparing a large diversity of scenarios, including the use of genomic evaluations. In order to illustrate the usefulness of the model, we simulated 3 selection strategies using classic breeding values and/or genomic breeding values. The genetic gain predictions obtained were then compared. The model included two traits T1 (h² = 0.13) and T2 (h² = 0.33), with a genetic correlation varying between 0 and 0.70 and a weight in the index of 40% and 60% respectively. Results show an increase of predicted gain for both traits with genomic evaluation. Improvement is constant for T2, whereas for T1 the increase of predicted gain is much better when genetic correlation between T1 and T2 is high. The genomic breeding scheme model seems more sensitive than the classic breeding scheme to parameters like the between traits correlation and their weight in the index. Keywords: poultry selection scheme, deterministic modelling, genomic selection

Sophie Brard-Fudulea, Yoannah François, Nabeel Alnahhas, Sophie Brard-Fudulea, Amandine Varenne, Thierry Burlot, Hervé Chapuis, Jean-Michel Elsen, Pascale Le Roy

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Electronic Poster Session - Methods and Tools - Models and Computing Strategies 2, , 853, 2018
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