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High amylose to amylopectin ratios in nitrogen-free diets decrease the ileal endogenous amino acid losses of broiler chickens
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Huajin Zhoua, Tahir Mahmoodb, Wei Wua, Yanhong Chena, Yao Yua, Jianmin Yuana, *
Animal Nutrition | 2023, 14(1) : 111 - 120
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Animal Nutrition | 2023, 14(1): 111-120
• Original Research Article •
High amylose to amylopectin ratios in nitrogen-free diets decrease the ileal endogenous amino acid losses of broiler chickens
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Huajin Zhoua, Tahir Mahmoodb, Wei Wua, Yanhong Chena, Yao Yua, Jianmin Yuana, *
Affiliations
  • aState Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
  • bAdisseo Animal Nutrition, DMCC, Dubai 00000, United Arab Emirates
Published: 2023-09-10 doi: 10.1016/j.aninu.2023.03.011
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This study explored the variation of ileal endogenous amino acid (IEAA) losses and its influencing factors in chickens offered nitrogen-free diets (NFD) containing different ratios of amylose to amylopectin (AM/AP). A total of 252 broiler chickens at 28d old were randomly allocated into 7 treatment groups for a 3d trial. The dietary treatments included a basal diet (control), a NFD containing corn starch (CS), and 5 NFD with AM/AP ratios of 0.20, 0.40, 0.60, 0.80, and 1.00, respectively. As the AM/AP ratio increased, the IEAA losses of all AAs, starch digestibility and maltase activity linearly decreased (P < 0.05), but the DM digestibility linearly and quadratically decreased (P < 0.05). Compared with the control, the NFD increased the number of goblet cells and its regulatory genes mucin-2 and krüppel-like factor 4 (KLF-4) while decreasing serum glucagon and thyroxine concentrations, ileal villus height, and crypt depth (P < 0.05). Additionally, NFD with lower AM/AP ratios (0.20 and 0.40) decreased the ileal microbiota species richness (P < 0.05). In all NFD groups, the number of Proteobacteria increased whereas the abundance of Firmicutes dropped (P < 0.05). However, the broilers in the AM/AP 0.60 group were closer to the digestive physiological state of chickens fed the control diet, with no significant change in maltase activity and mucin-2 expression (P < 0.05). In conclusion, increasing AM/AP ratio in a NFD decreased the IEAA losses and the apparent ileal digestibility of starch but inevitably resulted in malnutrition and disruption of gut microbiota homeostasis. This study recommends AM/AP in NFD at 0.60 to measure IEAA of broiler chickens.

Broiler chicken  /  Endogenous amino acid losses  /  Nitrogen-free diet  /  Amylose  /  Amylopectin  /  Goblet cells
Huajin Zhou, Tahir Mahmood, Wei Wu, Yanhong Chen, Yao Yu, Jianmin Yuan. High amylose to amylopectin ratios in nitrogen-free diets decrease the ileal endogenous amino acid losses of broiler chickens[J]. Animal Nutrition, 2023 , 14 (1) : 111 -120 . DOI: 10.1016/j.aninu.2023.03.011
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Year 2023 volume 14 Issue 1
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Article Info
doi: 10.1016/j.aninu.2023.03.011
  • Receive Date：2022-10-06
  • Online Date：2026-02-03
  • Published：2023-09-10
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History
  • Received：2022-10-06
  • Revised：2022-12-29
  • Accepted：2023-03-15
Affiliations
    aState Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
    bAdisseo Animal Nutrition, DMCC, Dubai 00000, United Arab Emirates

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* Corresponding author. E-mail address: (J. Yuan).
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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