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Article
Behavioral Associations during a Novel Object Test and Performance of Barrows Divergently Selected for ResidualFeed Intake
Animal Industry Report
  • Samaneh Azarpajouh, Iowa State University
  • Jessica Colpoys, Iowa State University
  • Emily Arkfeld, Iowa State University
  • Nicholas Gabler, Iowa State University
  • Anna Johnson, Iowa State University
  • Jack Dekkers, Iowa State University
  • Elisabeth Huff-Lonergan, Iowa State University
  • Steven Lonergan, Iowa State University
  • John Patience, Iowa State University
  • Kenneth Stalder, Iowa State University
Extension Number
ASL R3266
Publication Date
2018
Disciplines
Topic
Swine
Summary and Implications

Selection for decreased RFI is controversial from a welfare standpoint, given that the genetic variation in RFI reflects the genetic variation in activity and response to stress. The objective of this experiment was to examine the behavioral metric correlations and growth performance of barrows divergently selected for residual feed intake (RFI) during a novel object test. Forty low-(LRFI, more feed efficient) and 40 high-RFI (HRFI, less feed efficient) barrows from the 8th generation Yorkshire selection lines were randomly selected. Barrows were evaluated in a Novel Object Test for zone crossing, zone 1 (defined as the mouth, nose, and/or face of the pig contact any part of zone 1), escape, freeze, urination and defecation frequencies and their effect on performance measures. Within the HRFI line, zone crossing frequency accounted for 10.9% of the variation in 10th-rib back fat at off test (r= 0.33; P = 0.04). Within the LRFI line, freeze frequency accounted for 13.7% of the variation in feed conversion ratio (r= 0.37; P = 0.03) and defecation frequency accounted for 11.6% of the variation in 10th-rib back fat at off test (r= 0.34; P = 0.05). Therefore, within the context of the ISU swine genetic selection program for improved lean accretion and feed efficiency, there were no negative behavioral metrics that determinately affected performance measures during the grow-finish period.

Copyright Holder
Iowa State University
DOI
https://doi.org/10.31274/ans_air-180814-398
Language
en
Citation Information
Samaneh Azarpajouh, Jessica Colpoys, Emily Arkfeld, Nicholas Gabler, et al.. "Behavioral Associations during a Novel Object Test and Performance of Barrows Divergently Selected for ResidualFeed Intake" (2018)
Available at: http://works.bepress.com/anna_butters-johnson/316/