Transfer of blood urea nitrogen to cecal microbes and nitrogen retention in mature rabbits are increased by dietary fructooligosaccharides

Xiao Min, Jin Xiao, Kiyonori Kawasaki, Xiao Li, Ei Sakaguchi

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

To estimate the effect of fructooligosaccharides (FOS) on N utilization, seven mature rabbits were fed a diet containing 5% glucose or FOS for 8 days. During the last 5 days, total feces and urine were collected to measure N levels (Experiment 1). To examine N transfer from the blood to cecal microbes, eight rabbits were fed the same diets as in Experiment 1. After 9 days of feeding, 2g of glucose or FOS was given orally. Two hours later 20mg of 15N-urea was administered via the ear vein, and 1h later cecal and blood samples were collected (Experiment 2). Urinary N excretion was lowered by FOS feeding (P<0.05). Total bacterial N and 15N in the cecum was significantly higher in FOS-fed animals (P<0.05). Urea N in the cecum was lower in FOS-fed rabbits (P<0.05). Similarly, 15N atom % excess of cecal urea N was also lower in FOS-fed rabbits than in glucose-fed rabbits. These results suggest that FOS in the diet increases the transfer of blood urea N to the cecum for bacterial synthesis, thereby increasing N utilization.

Original languageEnglish (US)
Pages (from-to)671-677
Number of pages7
JournalAnimal Science Journal
Volume85
Issue number6
DOIs
Publication statusPublished - Jun 2014
Externally publishedYes

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Keywords

  • Bacterial N
  • Blood urea
  • Fructooligosaccharides
  • Mature rabbit
  • N retention

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

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