Effect of a Low Energy, High Fiber Diet Challenge on Yorkshire Pigs Selected for Residual Feed Intake

Friday, August 22, 2014: 2:30 PM
Bayshore Grand Ballroom A (The Westin Bayshore)
Emily D. Mauch , Iowa State University, Ames, IA
Jennifer M. Young , North Dakota State University, Fargo, ND
John F. Patience , Iowa State University, Ames, IA
Nicholas K. Gabler , Iowa State University, Ames, IA
Jack C. M. Dekkers , Iowa State University, Ames, IA
Abstract Text:

Purebred Yorkshire pigs from generations 8 and 9 (n=334) of the Iowa State residual feed intake (RFI) lines, selected for low and high RFI under a standard high energy and low fiber diet, were challenged with a low energy and high fiber diet. In two replicates, littermate gilts and barrows from each line were randomly split between diets and grown from ~40 to ~118 kg with individual feed intake recorded. Performance traits of average daily feed intake, average daily gain, gain to feed ratio, RFI, off-test ultrasound backfat and loin muscle area were evaluated. Results suggested that response to genetic selection for RFI under a high energy, low fiber diet may not translate into similar improvements in feed efficiency under a low energy, high fiber diet.


Residual feed intake

Yorkshire pigs

Feed efficiency