Journal
ANIMAL SCIENCE JOURNAL
Volume 85, Issue 6, Pages 671-677Publisher
WILEY
DOI: 10.1111/asj.12205
Keywords
bacterial N; blood urea; fructooligosaccharides; mature rabbit; N retention
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Funding
- Japan Society for the Promotion of Science, Japan [22580309]
- Grants-in-Aid for Scientific Research [22580309] Funding Source: KAKEN
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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.
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