Animal Bioscience

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Interaction between dietary digestible tryptophan and soy oligosaccharides in broiler chickens: effects on caecal skatole level and microflora

  • Jing Chen (College of Animal Science and Veterinary Medicine, Shenyang Agricultural University) ;
  • Hansong Jing (College of Animal Science and Veterinary Medicine, Shenyang Agricultural University) ;
  • Haiying Liu (College of Animal Science and Veterinary Medicine, Shenyang Agricultural University) ;
  • Xin Zhu (College of Animal Science and Veterinary Medicine, Shenyang Agricultural University) ;
  • Guiqin Yang (College of Animal Science and Veterinary Medicine, Shenyang Agricultural University)
  • Received : 2022.02.16
  • Accepted : 2022.08.05
  • Published : 2023.03.01
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Abstract

Objective: This study was conducted to evaluate the interactive effects of dietary digestible tryptophan (dTry) and soy oligosaccharides (SO) on growth performance, caecal skatole level, and microflora of broiler chickens aged from 14 to 42 days. Methods: Three hundred and sixty broiler chicks were allocated equally to 36 cages at 14-day-of-age according to body weight and gender. Using a 3×2 factorial arrangement, 3 dietary dTry levels (0.18%, 0.23%, and 0.28%) supplemented with 0 or 3.5 g/kg of SO were used to create 6 diets (treatments). Each diet was fed to six replicates of 10 birds (60 birds/treatment), growth performance was measured. Caecal content samples were collected at 42 days of age. Results: Results showed that significantly different dTry level×SO interactions were found for average daily gain (ADG), caecal levels of indole, propionic acid, and butyric acid, and microbial Shannon index (p<0.05). Birds fed diet containing 0.23% dTry level with SO supplementation had higher ADG and lower feed/gain ratio than those fed the other diets (p<0.05). Broilers fed diets containing 0.28% dTry increased their caecal levels of indole and skatole compared with those containing 0.18% or 0.23% dTry (p<0.01), regardless of SO addition. SO supplementation to diets decreased the caecal skatole level by 16.17% (p<0.05), and increased the relative frequency of Clostridium IV (p<0.05), regardless of dietary dTry level. Conclusion: These results indicated that diets containing 0.23% dTry with SO supplementation positively promoted ADG, and decreased caecal skatole levels of broiler chickens. The dietary dTry level, SO affected the caecal skatole level, however, there was no interaction between them.

Keywords

Acknowledgement

This research was funded by the National Natural Science Foundation of China (NSFC, Grant no. 31772618).

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