89
Dietary peroxidized corn oil reduces growth performance of nursery pigs

Monday, March 17, 2014: 2:45 PM
312-313 (Community Choice Credit Union Convention Center)
Andrea R Hanson , University of Minnesota, Saint Paul, MN
Pedro E. Urriola , University of Minnesota, Saint Paul, MN
Lee J. Johnston , University of Minnesota, West Central Research and Outreach Center, Morris, MN
Samuel Baidoo , Southern Research and Outreach Center, University of Minnesota, Waseca, MN
Chi Chen , University of Minnesota, Saint Paul, MN
Brian J. Kerr , USDA - ARS, Ames, IA
Gerald C Shurson , University of Minnesota, Saint Paul, MN
Abstract Text:

The dietary concentration at which peroxidized lipids impair growth of pigs is unknown. Weaned barrows (n = 128; initial BW = 6.3 ± 0.6 kg) were used to evaluate the effects of increasing dietary peroxidized corn oil on growth performance, and serum and liver α-tocopherol (α-T) and Se status. Pigs were blocked by initial BW and assigned to 1 of 32 pens (4 pigs/pen). Corn oil was heated for 7 h at 185°C (air flow rate = 12 L/min) to yield oxidized oil (Ox-O; peroxide value = 5.7 mEq O2/kg; thiobarbituric acid reactive substances = 26.7 mg malondialdehyde eq/kg). Pens were assigned to 1 of 4 diets containing: 9 % unheated oil + 0% Ox-O, 6% unheated oil + 3% Ox-O, 3% unheated oil + 6% Ox-O, or 0% unheated oil + 9% Ox-O. Diets were fed in 3 phases: d 1 to 4, d 5 to 14, and d 15 to 35 post-weaning. Pig BW and pen feed disappearance were determined by phase. Serum was collected on d 0, 14, and 35 from 1 pig per pen that was subsequently harvested to obtain liver and heart tissue. Serum and liver samples were analyzed for concentrations of α-T and Se. Data were analyzed with the MIXED procedure of SAS to evaluate linear, quadratic, and cubic effects of Ox-O, with block as a random effect. Serum data were evaluated as repeated measures. Gain:feed declined linearly (P = 0.03) from 0.73 for pigs fed 0% Ox-O to 0.72, 0.70, and 0.71 ± 0.01 for pigs fed 3, 6, and 9% Ox-O, respectively. Pigs fed Ox-O tended to have reduced ADG (377.5, 375.7, 369.4, and 347.0 ± 13.6 g/d for 0, 3, 6, and 9% Ox-O, respectively; P = 0.10), but ADFI was not affected by Ox-O (P > 0.05). In the liver, concentrations of α-T were not affected by increasing Ox-O, but concentrations of Se tended to decline cubically (P = 0.09) with increasing Ox-O. Regardless of sampling day, the concentration of α-T declined cubically (0.80, 0.56, 0.62, and 0.36± 0.04 ug/mL for 0, 3, 6, and 9% Ox-O, respectively; P = 0.005), and Se (P = 0.11) tended to decline linearly in serum of pigs fed increasing Ox-O. These results indicate that dietary inclusion of peroxidized corn oil reduces growth performance of nursery pigs linearly, with variable effect on α-tocopherol and Se status.

Keywords: nursery pigs, peroxidized corn oil, antioxidant

See more of: Graduate Student Competition: PhD Oral I
See more of: Graduate Student Oral Competition-Ph.D
<< Previous Abstract | Next Abstract >>

American Society of Animal Science, PO Box 7410, Champaign, IL 61826-7410 E-mail: asas@asas.org, Ph. 217.356.9050, Fax 217.689.2436 All pages Copyright © 2012 ASAS. All Rights Reserved.