Effect of added zinc in diets with ractopamine hydrochloride on growth performance, carcass characteristics, and ileal mucosal inflammation mRNA expression of finishing pigs

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dc.contributor.author Paulk, C. B.
dc.contributor.author Burnett, D. D.
dc.contributor.author Tokach, M. D.
dc.contributor.author Nelssen, J. L.
dc.contributor.author Dritz, Steven S.
dc.contributor.author Derouchey, J. M.
dc.contributor.author Goodband, R. D.
dc.contributor.author Hill, G. M.
dc.contributor.author Haydon, K. D.
dc.contributor.author Gonzalez, J. M.
dc.date.accessioned 2016-04-04T22:45:05Z
dc.date.available 2016-04-04T22:45:05Z
dc.identifier.uri http://hdl.handle.net/2097/32289
dc.description Citation: Paulk, C. B., Burnett, D. D., Tokach, M. D., Nelssen, J. L., Dritz, S. S., Derouchey, J. M., . . . Gonzalez, J. M. (2015). Effect of added zinc in diets with ractopamine hydrochloride on growth performance, carcass characteristics, and ileal mucosal inflammation mRNA expression of finishing pigs. Journal of Animal Science, 93(1), 185-196. doi:10.2527/jas2014-8286
dc.description Two experiments were conducted to determine the effects of increasing the dietary Zn content on growth performance, carcass characteristics, plasma Zn, and ileal mucosal inflammation mRNA expression of finishing pigs fed diets containing ractopamine HCl (RAC; Elanco Animal Health, Greenfield, IN). In Exp. 1, 312 pigs (327 × 1050; PIC, Hendersonville, TN; 94 kg BW) were used in a 27-d study. There were 2 pigs per pen and 26 pens per treatment. Treatments included a corn–soybean meal diet (control; 0.66% standardized ileal digestible [SID] Lys); a diet (0.92% SID Lys) with 10 mg/kg RAC; and the RAC diet plus 50, 100, or 150 mg Zn/kg from ZnO or 50 mg Zn/kg from a Zn AA complex (ZnAA; Availa-Zn; Zinpro, Eden Prairie, MN). All diets also contained 83 mg Zn/kg from ZnSO4 in the trace mineral premix. Pigs fed the RAC diet without added Zn had increased (P < 0.05) ADG, G:F, HCW, carcass yield, and loin weight compared with pigs fed the control diet. Increasing Zn from ZnO in diets containing RAC tended to increase (linear, P = 0.067) G:F and loin weight (quadratic, P = 0.064). Pigs fed diets with 50 mg Zn/kg from ZnAA tended to have increased (P = 0.057) ADG compared with pigs fed the RAC diet. In Exp. 2, 320 pigs (327 × 1050; PIC; 98 kg BW) were used in a 35-d study. There were 2 pigs per pen and 20 pens per treatment. Treatments included a control diet (0.66% SID Lys); a diet (0.92% SID Lys) with 10 mg/ kg RAC; or the RAC diet plus 75, 150, and 225 mg Zn/ kg from ZnO or ZnAA. All diets also contained 55 mg Zn/kg from ZnSO4 from the trace mineral premix. Pigs fed the RAC diet had increased (P < 0.05) ADG, G:F, HCW, loin depth, percentage lean, and liver weight compared with pigs fed the control diet. No Zn level or source effects or level × source interactions were observed for growth performance. A Zn level × source interaction (quadratic, P = 0.007) was observed in liver Zn concentrations. This resulted from liver Zn concentrations plateauing at 150 mg Zn/kg when ZnO was supplemented, while there was a linear increase when using ZnAA. Increasing Zn in diets containing RAC increased (linear, P < 0.05) plasma Zn on d 18 and 32. The expression of IL-1? was increased (P = 0.014) in mucosa of pigs fed the RAC diet compared with those fed the control diet. Expression of IL-1? decreased (linear, P = 0.026) in the mucosa of pigs fed increasing added Zn. In conclusion, adding Zn to diets containing RAC resulted in a trend for improved growth performance of pigs in 1 of 2 experiments. Also, additional Zn increased plasma Zn and reduced IL-1?. © 2015 American Society of Animal Science. All rights reserved.
dc.relation.uri http://doi.org/10.2527/jas.2014-8286
dc.rights Copyright © 2015. American Society of Animal Science. 
dc.rights.uri http://www.sherpa.ac.uk/romeo/issn/0021-8812/
dc.subject Beta Agonist
dc.subject Inflammatory Cytokines
dc.subject Liver
dc.subject Plasma
dc.subject Porcine
dc.subject Zinc Amino Acid Complex
dc.title Effect of added zinc in diets with ractopamine hydrochloride on growth performance, carcass characteristics, and ileal mucosal inflammation mRNA expression of finishing pigs
dc.type Article
dc.date.published 2015
dc.citation.doi 10.2527/jas.2014-8286
dc.citation.epage 196
dc.citation.issn 0021-8812
dc.citation.issue 1
dc.citation.jtitle Journal of Animal Science
dc.citation.spage 185
dc.citation.volume 93
dc.contributor.authoreid dritz


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