Waldenstedt L, Björnhag G
Department of Animal Physiology, Swedish University of Agricultural Sciences, Uppsala.
Dtsch Tierarztl Wochenschr. 1995 Apr;102(4):168-9.
Retrograde flow of urine into the caeca provides a more efficient recovery of nutrients and supplies a nitrogen source for the caecal microbes. 30 laying hens of Leghorn type were used in the present experiments. Hens were randomly divided into three treatment groups and fed a high nitrogen (19.8% crude protein in dry matter), medium (15.0% crude protein in dry matter), or low (10.6% crude protein in dry matter) isocaloric diet for fourteen days prior to and during the experimental period (8 h). Results from the study show that the retrograde flow of urine from cloaca to caeca is significantly higher in birds given a low protein diet compared to medium or high levels. It also shows that the produced amount of urine is significantly higher in hens given a low protein diet compared to the medium level diet.
尿液逆向流入盲肠能更有效地回收营养物质，并为盲肠微生物提供氮源。本实验使用了30只来航鸡品种的蛋鸡。在实验期（8小时）之前及期间，母鸡被随机分为三个处理组，分别饲喂高氮（干物质中粗蛋白含量为19.8%）、中氮（干物质中粗蛋白含量为15.0%）或低氮（干物质中粗蛋白含量为10.6%）的等热量日粮，为期14天。研究结果表明，与中蛋白或高蛋白水平的鸡相比，低蛋白日粮组的鸡从泄殖腔到盲肠的尿液逆向流量显著更高。研究还表明，与中等蛋白水平日粮的母鸡相比，低蛋白日粮组母鸡产生的尿量显著更高。
