Effect of diet complexity and dietary fish peptide and enzyme complex supplementation on weanling pigs

• Published in: Livestock science 2022-09, Vol.263, p.105020, Article 105020
• Main Authors: Guo, J., Wilson, T.B., Chiba, L.I., Spangler, E.A., Wu, G., Shieh, T.
• Format: Article
• Language: English
• Subjects: Diet complexity; Fish peptides; Growth performance; Multienzyme complexes; Serum metabolites; Weanling pig
• ISSN: 1871-1413; 1878-0490
• DOI: 10.1016/j.livsci.2022.105020

•The objective was to explore the potential of replacing complex weanling pig diets with simple corn-soybean meal (SBM) diets by feed additive supplementation.•The effort was made to determine the optimum inclusion rate of fish peptides in weanling pig diets in the first experiment.•The possibility of replacing complex diets with simple corn-SBM diets by fish peptide and enzyme supplementation was investigated in the second experiment.•A complex weanling pig diet can be replaced with a simple corn-SBM diet by fish peptide and enzyme supplementation during the phase 1 (d 0 to 14). Two experiments were conducted to assess the potential of replacing complex weanling pig diets with simple corn-soybean meal (SBM) diets by supplementation with a feed additive. The effort was made to determine the optimum inclusion rate of fish peptides in experiment 1 (Exp. 1), whereas the possibility of replacing complex diets with simply corn-SBM diets was investigated in Exp. 2. Ninety six (7.9 ± 0.7 kg) and 48 (7.8 ± 0.8 kg) pigs were used in Exp. 1 and 2, respectively, and pigs were assigned randomly to 6 (Exp. 1) and 3 (Exp. 2) dietary treatments with 4 pens per treatment and 2 gilts and 2 castrated males per pen in both experiments. The phase 1 (d 0 to 14) and 2 (d 14 to 28) complex, positive control diets (POS) were formulated in both experiments. Two simple corn-SBM, negative control (NEG) diets were formulated to be iso-lysinic to the POS diets in Exp. 1, and the NEG diets were supplemented with 0.5, 1.0, 1.5, or 2.0% fish peptides. Similarly, the phase 1 and 2 simple corn-SBM, NEG diets were formulated to be iso-lysinic to the POS diets in Exp. 2. However, the NEG diets contained 1.5% fish peptides, and those diets were supplemented with multienzyme complexes (ALL). During the wk 4, blood sample was collected and analyzed for serum metabolites and cytokines in Exp. 1 and metabolites in Exp. 2. During the last 2 wk of Exp. 1, the intake of feed, Lys, and digestible energy (DE) increased (cubic, P