Abstract

Selection for resilience is a practical alternative to selection for resistance and tolerance to disease, which would require collection of pathogen load and performance. If resilience is to be used in the breeding goal, resilience phenotypes are needed. Individual feed intake in a disease challenged environment is attractive as it is sensitive to illness due to physiological responses (such as IL-6 and TNF- a ). Pigs in this study were exposed to multiple diseases in a natural challenge environment. Phenotypes extracted from individual daily feed intake during finishing were the root mean square error (RMSE) of the individual regression of feed intake or duration at the feeder on age. These measures were heritable, moderately genetically correlated with each other (0.47 6), and favorably correlated with mortality and number of treatments (0.54 to 0.65). Neither RMSE trait showed strong genetic correlations to other production traits. This research suggests that an individual's variation in feed intake and feeding duration can be used to characterize and select for resilience in finishing pigs. Keywords: mean square error, resilience, feed intake, disease resistance, wean-to-finish "

Austin Putz, John Harding, Michael Dyck, Robert Kemp, Fred Fortin, Graham Plastow, Jack Dekkers

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Challenges - Genotype by Environment Interactions, , 671, 2018
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