Behavior and peripheral amine concentrations in relation to ractopamine feeding, sex, and social rank of finishing pigs

Journal of Animal Science
R PolettoJ N Marchant-Forde

Abstract

Aggression can impair productivity and well-being. The association between aggression in finishing pigs and the feed additive ractopamine (RAC), a beta-adrenoreceptor agonist, is unknown and warrants further investigation. Our goal was to examine behavioral activity, including aggression, in the home pen and concentrations of peripheral amines in barrows and gilts, taking into account diet (RAC) and social rank. Sixty-four finishing pigs, housed in pens of 4 by sex, were fed either a control (CTL) or RAC-added (5 mg/kg for 2 wk plus 10 mg/kg for another 2 wk) diet. The top dominant and bottom subordinate pigs in each pen were determined at mixing (2 wk pretrial). The behavior of all pigs was recorded continuously during the pretrial week (baseline) and for the following 4 wk. These behavioral data were used to evaluate home pen aggression, including the number of agonistic interactions (AINX) and constituent aggressive actions, during a 3-h period (0800 to 1100 h) once per week and their change in relation to the baseline. Time-budget behaviors and postures were analyzed over eight 24-h periods (2 d/wk) using 10-min instantaneous scan sampling that focused on only the dominant and subordinate pigs in each pen. These 2 pigs were...Continue Reading

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Citations

Dec 21, 2012·Animal : an International Journal of Animal Bioscience·K O'DriscollL A Boyle
Aug 6, 2014·Proteomics. Clinical Applications·Anna BassolsJoan Tibau
Oct 29, 2013·Experimental Physiology·Martin BahlsSean C Newcomer
May 7, 2014·The Journal of Pharmacology and Experimental Therapeutics·Xuehong LiuAaron Janowsky
Aug 4, 2012·Journal of Animal Science·J N Marchant-FordeB T Richert
Dec 1, 2017·Translational Animal Science·M J RitterM S Calvo-Lorenzo

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