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The effect of cecum enlarging substances on protein utilization and digestibility of cellulose in rats



The effect of cecum enlarging substances on protein utilization and digestibility of cellulose in rats



Acta Agraria et Silvestria Series Zootechnia 18(1-2): 35-48



The effect of different doses of lactose and magnesium sulfate on rats cecum enlargement, utilization of protein and cellulose digestibility was investigated. Semisynthetic diets contained fish meal and lucerne meal protein 12%. Lucerne meal was the only source of cellulose. In experiment I animals were fed diets containing lactose for 29 days; from the 30th to the 60th day, all groups were fed with control diet. Lactose induced cecal enlargement in volume and dry tissue:body weight ratio. These differences diminished after rats reverted to control diet. The addition of lactose increased the biological value while decreased true digestibility of protein measured with the Thomas-Mithell balance method. The enlargement of the cecum had no beneficial effect on cellulose digestibility. Magnesium sulfate induced cecum enlargement, but dry tissue:body weight ratio was lower than in the case of lactose. In the first days of experiment II, 6% addition of magnesium sulfate increased the biological value of protein but induced diarrhea which reduced protein and cellulose digestibility. After 45 days diarrhea ceased and protein and cellulose digestibility leveled to control diets.

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