Effects of dietary copper, zinc, and ractopamine hydrochloride on finishing pig growth performance, carcass characteristics, and antimicrobial susceptibility of enteric bacteria

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dc.contributor.author Feldpausch, J. A.
dc.contributor.author Amachawadi, Raghavendra G.
dc.contributor.author Tokach, Michael D.
dc.contributor.author Scott, H. M.
dc.contributor.author Nagaraja, Tiruvoor G.
dc.contributor.author Dritz, Steven S.
dc.contributor.author Goodband, Robert D.
dc.contributor.author Woodworth, Jason C.
dc.contributor.author DeRouchey, Joel M.
dc.date.accessioned 2017-02-14T22:49:38Z
dc.date.available 2017-02-14T22:49:38Z
dc.identifier.uri http://hdl.handle.net/2097/35129
dc.description Citation: Feldpausch, J. A., Amachawadi, R. G., Tokach, M. D., Scott, H. M., Nagaraja, T. G., Dritz, S. S., . . . DeRouchey, J. M. (2016). Effects of dietary copper, zinc, and ractopamine hydrochloride on finishing pig growth performance, carcass characteristics, and antimicrobial susceptibility of enteric bacteria. Journal of Animal Science, 94(8), 3278-3293. doi:10.2527/jas2016-0340
dc.description.abstract A total of 480 pigs (PIC 327 × 1050; initially 48.7 ± 2.3 kg) were used to determine the interactive effects of supplemental Cu, Zn, and ractopamine HCl (RAC) on finishing pig growth performance, carcass characteristics, and antimicrobial susceptibility of enteric bacteria. Treatments were arranged in a 2 × 2 × 2 factorial with the main effects of added Cu (CuSO4; 0 vs. 125 mg/kg Cu), Zn (ZnO; 0 vs. 150 mg/kg Zn), and RAC (0 vs. 10 mg/kg during the last 28 d prior to marketing). All diets contained 11 mg/kg Cu and 73 mg/ kg Zn from the trace mineral premix. Pens of pigs were balanced and blocked on initial BW and then randomly allotted to 1 of the 4 mineral treatment diets. At 28 d prior to marketing, pens within each block and mineral treatment were randomly assigned to receive either 0 or 10 mg/kg RAC in addition to the mineral treatment. Adding either Cu or Zn alone did not improve ADG or ADFI yet resulted in numerical improvements in overall G:F and caloric efficiencies, but improvements were not additive (Cu × Zn, P = 0.057, P = 0.068, and P = 0.064 for G:F and caloric efficiency on a ME and NE basis, respectively). Ractopamine improved (P < 0.001) overall ADG, G:F, and caloric efficiency, thereby increasing final BW by 3% with no change in ADFI. Ractopamine also increased (P < 0.001) HCW, percentage carcass yield, G:F, loin depth, and percent fat-free lean and decreased (P = 0.014) backfat. Adding Zn or Cu alone to diets containing RAC numerically improved percent yield and HCW G:F, but this effect was absent when the Cu or Zn was added to the control diet or when Cu and Zn were fed in combination in RAC diets (Cu × Zn × RAC, P = 0.011 and P = 0.018 for yield and HCW G:F, respectively). Fecal samples were collected on d 0 and at the conclusion of the finishing period (d 90) for bacterial isolation and antimicrobial susceptibility determinations according to Clinical and Laboratory Standards Institute minimal inhibitory concentrations breakpoints. Enterococcus spp. and Escherichia coli isolates displayed varying levels of resistance to certain antibiotics prior to initiation of treatments on d 0. Resistance to most antibiotics decreased (P < 0.05) over time or was stable for those that had a low baseline percentage of resistance. Neither Zn nor RAC adversely affected antimicrobial resistance. However, extended feeding of 125 mg/kg Cu throughout the finishing period seems to decrease enterococcal susceptability to tetracycline, tylosin, and quinupristin/dalfopristin. © 2016 American Society of Animal Science. All rights reserved.
dc.relation.uri https://doi.org/10.2527/jas.2016-0340
dc.rights © 2016 American Society of Animal Science. All rights reserved. This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
dc.rights.uri http://www.sherpa.ac.uk/romeo/issn/1525-3163/
dc.subject Antimicrobial Resistance
dc.subject Enteric Bacteria
dc.subject Finishing Pig
dc.subject Growth Performance
dc.title Effects of dietary copper, zinc, and ractopamine hydrochloride on finishing pig growth performance, carcass characteristics, and antimicrobial susceptibility of enteric bacteria
dc.type Article
dc.date.published 2016
dc.citation.doi 10.2527/jas.2016-0340
dc.citation.epage 3293
dc.citation.issn 0021-8812
dc.citation.issue 8
dc.citation.jtitle Journal of Animal Science
dc.citation.spage 3278
dc.citation.volume 94
dc.description.embargo 8/4/2017
dc.contributor.authoreid jderouch
dc.contributor.authoreid agraghav
dc.contributor.authoreid mtokach
dc.contributor.authoreid tnagaraj
dc.contributor.authoreid dritz
dc.contributor.authoreid goodband
dc.contributor.authoreid jwoodworth
dc.contributor.kstate DeRouchey, Joel M.
dc.contributor.kstate Amachawadi, Raghavendra G.
dc.contributor.kstate Tokach, Michael D.
dc.contributor.kstate Nagaraja, Tiruvoor G.
dc.contributor.kstate Dritz, Steven S.
dc.contributor.kstate Goodband, Robert D.
dc.contributor.kstate Woodworth, Jason C.
dc.contributor.kstate Amachawadi, R. G.
dc.contributor.kstate Scott, H. M.


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