Diet by Genotype Interaction in Yorkshire Pigs Divergently Selected for Feed Efficiency

  • Emily Mauch (North Carolina State University)
  • Nick Serão (North Carolina State University)
  • Jennifer Young (North Dakota State University)
  • John F. Patience (Iowa State University)
  • Nicholas K. Gabler (Iowa State University)
  • Jack C. M. Dekkers (Iowa State University)


For ten generations, purebred Yorkshire pigs were divergently selected for increased and decreased feed efficiency based on residual feed intake when fed a standard corn and soybean-meal based diet. In this study, gilts and barrows bornin generations 8, 9, and 10were fed either a standard diet or an alternative diet that incorporated by-products while reducing corn and soybean-meal, resultingina lower energy, higher fiber diet. Genotypeby diet interactions were investigatedby estimating heritabilities, genetic correlations, response to selection,and genome wide associations for six traits based on thesetwo diets. Results indicate that feed efficiency is a genetically complex trait that appears to be genetically different depending on the diet fed. Thus, genetic gains made by selection on standard diets may not be fully expressed in swine production systems that use alternative diets, particularly those incorporating by-products.

How to Cite:

Mauch, E., Serão, N., Young, J., Patience, J. F., Gabler, N. K. & Dekkers, J. C., (2017) “Diet by Genotype Interaction in Yorkshire Pigs Divergently Selected for Feed Efficiency”, Iowa State University Animal Industry Report 14(1). doi: https://doi.org/10.31274/ans_air-180814-287

Download pdf



Published on
01 Jan 2017
Peer Reviewed