Effects of dietary astaxanthin and ractopamine HCl on the growth and carcass characteristics of finishing pigs and the color shelf-life of longissimus chops from barrows and gilts

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dc.contributor.author Bergstrom, J.R.
dc.contributor.author Skaar, G.R.
dc.contributor.author Houser, Terry A.
dc.contributor.author Tokach, Michael D.
dc.contributor.author Dritz, Steven S.
dc.contributor.author Nelssen, Jim L.
dc.contributor.author Goodband, Robert D.
dc.contributor.author DeRouchey, Joel M.
dc.date.accessioned 2012-02-16T19:45:22Z
dc.date.available 2012-02-16T19:45:22Z
dc.date.issued 2012-02-16
dc.identifier.uri http://hdl.handle.net/2097/13497
dc.description.abstract A total of 160 pigs (initially 198 lb) were used to evaluate the effects of increasing dietary astaxanthin (AX, from Xanthophyllomyces dendrorhous yeast) and Ractopamine HCl (RAC) on the growth and carcass characteristics of finishing pigs as well as the color shelf-life of longissimus muscle (LM) chops from barrows and gilts. Pigs were weighed and randomly allotted to 1 of 8 dietary treatments fed for approximately 26 d preharvest. Dietary treatments consisted of a corn-soybean meal-based control diet, the control diet with 7.5, 15, 30, 60, or 120 ppm AX, and a corn-soybean meal-based diet with 10 ppm RAC and 7.5 or 20 ppm AX. Each treatment had 10 pens, with 2 pigs (1 barrow and 1 gilt) in each pen. A split-plot design with repeated measures was used to compare color characteristics of LM chops from individual barrows and gilts. Overall, pigs fed RAC had increased (P < 0.01) ADG and final BW and improved F/G compared with pigs not fed RAC. Among pigs not fed RAC, F/G improved (quadratic, P < 0.05) and a trend (quadratic, P < 0.06) was observed for increased ADG with increasing AX to 60 ppm. For carcass characteristics, pigs fed RAC had greater (P < 0.03) HCW, 10th-rib LM area, 24-h LM pH, and fat-free lean index (FFLI) than those not fed RAC treatments. Among pigs not fed RAC, a trend (quadratic, P < 0.07) occurred for increased yield with increasing AX. During 6 d of retail display, the initial (d 0) NPPC color score of LM chops from gilts was greater (P < 0.03) than that of chops from barrows. Subjective discoloration scores of LM chops did not differ initially, but increased (linear, P < 0.01) daily and were greater (P < 0.02) on d 6 for chops from barrows and pigs not fed RAC than chops from gilts and pigs fed RAC, respectively (gender × d and treatment × d interactions, P < 0.04). The CIE a* (redness) and CIE b* (yellowness) of LM chops decreased (linear, P < 0.01) during retail display, and chops from gilts and pigs fed RAC had lower (P < 0.04) CIE b* than chops from barrows and pigs not fed RAC, respectively, especially on d 0 (gender × d and treatment × d interaction, P < 0.01). Overall (d 0 to 6), discoloration scores and changes in objective total color were lower (P < 0.02) for LM chops from gilts and pigs fed RAC. These observations suggest that color shelf-life was extended for chops from gilts and pigs fed RAC. en_US
dc.publisher Kansas State University. Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Swine Day, 2011 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 12-064-S en_US
dc.relation.isPartOf Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 1056 en_US
dc.subject Swine en_US
dc.subject Astaxanthin en_US
dc.subject Carcass characteristics en_US
dc.subject Finishing pig en_US
dc.subject Pork color en_US
dc.subject Ractopamine HCl en_US
dc.title Effects of dietary astaxanthin and ractopamine HCl on the growth and carcass characteristics of finishing pigs and the color shelf-life of longissimus chops from barrows and gilts en_US
dc.type Conference paper en_US
dc.date.published 2011 en_US
dc.citation.epage 340 en_US
dc.citation.spage 330 en_US
dc.description.conference Swine Day, Manhattan, KS, November 17, 2011 en_US
dc.contributor.authoreid jnelssen en_US
dc.contributor.authoreid houser en_US
dc.contributor.authoreid mtokach en_US
dc.contributor.authoreid goodband en_US
dc.contributor.authoreid jderouch en_US
dc.contributor.authoreid dritz en_US


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