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Title: Characterisation of undigested components throughout the gastrointestinal tract of broiler chickens fed either a wheat- or maize-based diet
Contributor(s): Kim, Eunjoo  (author); Morgan, Natalie K  (author)orcid ; Moss, Amy F  (author)orcid ; Li, Lily  (author); Ader, Peter (author); Choct, Mingan  (author)orcid 
Publication Date: 2022-03
Early Online Version: 2021-10-20
Open Access: Yes
DOI: 10.1016/j.aninu.2021.09.011
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Abstract: This study was to characterise the undigested nutrients present along the gastrointestinal tract of birds offered common wheat- or maize-based diets, with the goal of optimising utilisation of enzymes to enhance digestive efficiency. Wheat- and maize-based diets were offered to 240 mixed-sex broilers (10 birds/pen; n = 12) from 1 to 35 d poste-hatch. Digestibility of dry matter, starch, crude protein and nonstarch polysaccharides (NSP) were measured in the crop, gizzard, duodenum, jejunum, ileum, caeca and excreta at d 12 and 35 poste-hatch. Analysis of nutrient levels in the excreta presented that more than 30% of nutrients provided in the feed was wasted, irrespective of wheat or maize diet type. On average, 92 g/kg crude protein, 92 g/kg insoluble NSP and 14 g/kg oligosaccharides were not utilised by birds at d 12 poste-hatch. The quantity of water-insoluble NSP in the small intestine at d 12 was lower in birds offered the wheat-based diet compared to those fed the maize-based diet (P < 0.05), with the reverse being true for water-soluble NSP (P < 0.001). On average, 84 g/kg crude protein, 79 g/kg insoluble NSP and 9 g/kg oligosaccharides remained in the excreta at 35 d of age. At this time period, accumulation of feed in the gizzard was noted for birds offered both diets, but was more pronounced in those offered the maize-based diet (P < 0.001). Birds offered the maize-based diet demonstrated improved utilisation of oligosaccharides compared to those fed the wheat-based diet at both d 12 and 35 (P = 0.087 and P = 0.047, respectively). Protein utilisation in the jejunum and ileum was greater in birds offered the wheat-based diet compared to those fed the maize-based diet (P = 0.004 and P < 0.001, respectively). Thus, while both diets supported standard growth performance of birds, the degree and flow of nutrient disappearance along the gastrointestinal tract was influenced by cereal type and bird age.
Publication Type: Journal Article
Source of Publication: Animal Nutrition, 8(1), p. 153-159
Publisher: Zhongguo Xumu Shouyi Xuehui, Chinese Association of Animal Science and Veterinary Medicine
Place of Publication: China
ISSN: 2405-6383
Fields of Research (FoR) 2020: 300303 Animal nutrition
300301 Animal growth and development
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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