HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Erratum An erratum has been published All Versions of this Article: jas.2006-262v1 85/4/1046    most recent Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Sawyer, J. T. Articles by Fakler, T. M. Search for Related Content PubMed PubMed Citation Articles by Sawyer, J. T. Articles by Fakler, T. M.

Effects of supplemental manganese on performance of growing-finishing pigs and pork quality during retail display¹

J. T. Sawyer^*, A. W. Tittor^,2, J. K. Apple^*,3, J. B. Morgan, C. V. Maxwell^*, L. K. Rakes^* and T. M. Fakler

^* Department of Animal Sciences, University of Arkansas, Fayetteville 72701; and Department of Animal Science, Oklahoma State University, Stillwater 74074; and and Zinpro Corporation, Eden Prairie, MN 55344

³ Corresponding author: japple{at}uark.edu

Crossbred barrows and gilts (n = 168) were used to test the effects of supplemental Mn during the growing-finishing period on performance, pork carcass characteristics, and pork quality during 7 d of retail display. Pigs were blocked by BW and allotted within blocks to pens (5 pigs/pen in blocks 1, 2, 5, and 6, and 4 pigs/pen in blocks 3 and 4). A total of 36 pens was randomly assigned to 1 of 6 dietary treatments, where the basal diets were formulated with (PC) or without (NC) Mn in the mineral premix, and supplemented with 0 or 350 ppm (as-fed basis) of Mn from MnSO₄ or a Mn-AA complex (AvMn). Pigs were slaughtered at a commercial pork packing plant when the lightest block of pigs averaged 113.6 kg. During fabrication, boneless pork loins were collected and transported to Oklahoma State University, where 2.5-cm-thick LM chops were packaged in a modified atmosphere (80% O₂ and 20% CO₂) and subsequently placed in display cases (2 to 4° C) under continuous fluorescent lighting (1,600 lx) for 7 d. Pig performance was not (P 0.44) affected by supplemental Mn; however, during the grower-II phase, pigs fed the basal diets including Mn consumed less (P < 0.02) feed and tended to be more efficient (P < 0.09) than pigs fed the basal diets devoid of Mn. Throughout the entire feeding trial, neither dietary nor supplemental Mn altered (P 0.22) ADG, ADFI, or G:F. Chops from pigs fed the diets supplemented with MnSO₄ received greater (P 0.05) lean color scores and had a redder (greater a* and hue angle values), more vivid color than chops from pigs fed the diets supplemented with AvMn. Additionally, LM chops from pigs fed the PC diets supplemented with MnSO₄ were darker (lower L* values; P < 0.05) than chops from pigs fed the NC diets or PC diets supplemented with 0 or 350 ppm of AvMn. Even though discoloration scores were similar during the first 4 d of display, chops from pigs fed the PC diets supplemented with MnSO₄ were less (P < 0.05) discolored on d 6 and 7 of retail display than chops from pigs fed the PC or NC diets and diets supplemented with AvMn (dietary treatment x display time, P = 0.04). Results of this study indicate that feeding an additional 350 ppm of Mn from MnSO₄ above the maintenance requirements of growing-finishing pigs does not beneficially affect live pig performance but may improve pork color and delay discoloration of pork during retail display.

Key Words: color • manganese • performance • pork • quality • retail display