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https://hdl.handle.net/1959.11/29315
Title: | A mono-component microbial protease improves performance, net energy, and digestibility of amino acids and starch, and upregulates jejunal expression of genes responsible for peptide transport in broilers fed corn/wheat-based diets supplemented with xylanase and phytase | Contributor(s): | Cowieson, A J (author); Toghyani, M (author); Kheravii, S K (author); Wu, S-B (author) ; Romero, L F (author); Choct, M (author) | Publication Date: | 2019-03-01 | Open Access: | Yes | DOI: | 10.3382/ps/pey456 | Handle Link: | https://hdl.handle.net/1959.11/29315 | Abstract: | A total of 90 male Ross 308 broiler chicks were used in a digestibility and performance bioassay to explore the effect of reduction in dietary protein and digestible amino acids and inclusion of an exogenous mono-component protease on amino acid digestibility, net energy, jejunal gene expression, and bird performance. Four dietary treatments were created by the supplementation, or not, of 2 control diets with a mono-component exogenous protease. The control diets were corn/wheat/soybean meal-based and were formulated to be either nutritionally adequate or reduced in protein and amino acids (around 3%). The 2 control diets were supplemented with xylanase and phytase (2000 FYT). Treatments were therefore arranged as a 2 × 2 factorial design. The reduction in diet nutrient density had no significant effect on various experimental outcomes (including bird performance, amino acid digestibility, and net energy [NE]) that were measured with the exception of a reduction in the expression of aminopeptidase N and glucose transporter 2. However, the addition of exogenous protease resulted in an increase in weight gain and a reduction in feed conversion ratio (around 4%; P< 0.05) and an increase in the digestibility of several amino acids (P< 0.05) and starch (P= 0.06). Protease addition also resulted in an increase in both apparent metabolizable energy (AME) (+73 kcal/kg; P< 0.05) and NE (+107 kcal/kg; P< 0.05). The addition of exogenous protease to the diet also increased the jejunal expression of genes responsible for peptide transport (PepT2; P< 0.01) and starch digestion (sucrase isomaltase; P= 0.06). These results confirm the efficacy of exogenous protease in broiler diets that contain both xylanase and phytase and suggest substantial beneficial effects that extend beyond protein and amino acid nutrition. The effect of exogenous protease on energy partitioning, starch digestibility and the efficiency of nitrogen cycling is an area for further study. | Publication Type: | Journal Article | Source of Publication: | Poultry Science, 98(3), p. 1321-1332 | Publisher: | Elsevier BV | Place of Publication: | Netherlands | ISSN: | 1525-3171 0032-5791 |
Fields of Research (FoR) 2008: | 070204 Animal Nutrition | Fields of Research (FoR) 2020: | 300303 Animal nutrition | Socio-Economic Objective (SEO) 2008: | 830309 Poultry | Socio-Economic Objective (SEO) 2020: | 100411 Poultry | Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article School of Environmental and Rural Science |
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openpublished/AMonoComponentToghyaniKheraviiWuChoct2019JournalArticle.pdf | Published version | 111.3 kB | Adobe PDF Download Adobe | View/Open |
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