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Health benefits of supplementing nursery pig diets with microalgae or fish oil
  • Alison V. Lee, University of Guelph
  • Lan You, University of Guelph
  • Se Young Oh, University of Guelph
  • Ziwei Li, University of Guelph
  • Alexandra Code, University of Guelph
  • Cuilan Zhu, University of Guelph
  • Rebecca E. Fisher-Heffernan, University of Guelph
  • Timothy R.H. Regnault, Western University
  • Cornelis F.M.De Lange, University of Guelph
  • Lee Anne Huber, University of Guelph
  • Niel A. Karrow, University of Guelph
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Weaning stress can negatively impact a pig’s performance; dietary supplementation with omega-3 polyunsaturated fatty acids (n-3 PUFA) reduces inflammatory stress and promotes nursery pig’s health and growth. Fish oil (FO) is a major source of n-3 PUFA; however, microalgae (AL) may provide an alternative source of n-3 PUFA. The aim of this study was to assess the health benefits of supplementing a plant protein-based nursery diet with 3.12% AL or 1.25% FO providing equal total n-3 PUFA compared to a control (CON) diet. Seventy-two pigs were fed experimental diets for three weeks (phases 1 and 2), followed by a common standard diet for three weeks (phase 3). Following phase 2, 8 pigs per treatment underwent a lipopolysaccharide (LPS) immune stress challenge to assess the acute-phase response and 8 pigs per treatment were vaccinated with novel antigens to assess acquired immunity. No significant differences in piglets’ growth were observed, despite decreased feed intake in FO piglets compared to AL piglets in phase 3. AL supplementation tended to reduce, and FO supplementation significantly reduced the LPS-induced fever response. The AL pigs had significantly reduced cortisol responses, increased cytokine concentrations, and increased chromogranin A concentrations compared to FO and CON pigs following LPS challenge. Results suggest that AL or FO supplementation in nursery diets differentially modulate the acute-phase response, possibly due to different n-3 PUFA profiles between the two ingredients.

Citation Information
Alison V. Lee, Lan You, Se Young Oh, Ziwei Li, et al.. "Health benefits of supplementing nursery pig diets with microalgae or fish oil" Animals Vol. 9 Iss. 3 (2019)
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