Transfer of blood urea nitrogen to cecal microbes and nitrogen retention in mature rabbits are increased by dietary fructooligosaccharides.
ANIMAL SCIENCE JOURNAL(2014)
摘要
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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关键词
bacterial N,blood urea,fructooligosaccharides,mature rabbit,N retention
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