Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/26747
Title: Dietary starch influences growth performance, nutrient utilisation and digestive dynamics of protein and amino acids in broiler chickens offered low-protein diets
Contributor(s): Moss, Amy F  (author)orcid ; Sydenham, Christine J (author); Khoddami, Ali (author); Naranjo, Victor D (author); Liu, Sonia Yun (author); Selle, Peter H (author)
Publication Date: 2018-03
Early Online Version: 2018-01-02
DOI: 10.1016/j.anifeedsci.2018.01.001
Handle Link: https://hdl.handle.net/1959.11/26747
Abstract: A total of 288 day-old, male Ross 308 chicks were offered six dietary treatments from 7 to 28 days post-hatch. A standard maize-soy diet was compared with five low protein diets containing high inclusions of maize starch and various combinations of supplemental amino acids. The assessed parameters included growth performance, nutrient utilisation, digestibility coefficients and disappearance rates of starch, protein and amino acids in four small intestinal segments. Also, the effects of three dietary treatments on free plasma amino acid concentrations in the anterior mesenteric vein or portal circulation were determined. The transition from standard to low protein diets elevated feed intakes and compromised FCR. Overall, tangible differences in responses were not observed in birds offered the five low protein diets which effectively precluded meaningful comparisons between the various combinations of crystalline amino acids. Maize starch inclusions in low protein diets enhanced starch digestibility coefficients and disappearance rates and parameters of nutrient utilisation. However, maize starch also depressed protein digestibility coefficients and disappearance rates. Moreover, amino acid digestibility coefficients were depressed in the three posterior segments of the small intestine. Instructively, proximal ileal starch digestibility coefficients were negatively correlated with digestibility coefficients of twelve amino acids in the proximal ileum to significant extents. Significant differences in concentrations of free amino acids in plasma from the anterior mesenteric vein were observed for histidine, lysine, methionine, threonine and valine in birds offered the standard and two low protein diets. The possibility that glucose and amino acids were effectively competing for intestinal uptakes, especially from the ileum, is discussed. Also, it appears that the metabolic fates of amino acids in enterocytes of the gut mucosa can be manipulated by dietary strategies and that crystalline amino acids may be less prone to undergo catabolism in the gut mucosa.
Publication Type: Journal Article
Source of Publication: Animal Feed Science and Technology, v.237, p. 55-67
Publisher: Elsevier BV
Place of Publication: Netherlands
ISSN: 1873-2216
0377-8401
Fields of Research (FoR) 2008: 070204 Animal Nutrition
070202 Animal Growth and Development
Fields of Research (FoR) 2020: 300303 Animal nutrition
300301 Animal growth and development
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
Appears in Collections:Journal Article
School of Environmental and Rural Science

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