ウサギにおける水溶性および不溶性指標物質の糞中への排泄様式について

概要

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Experiments were carried out to confirm whether polyvinyl alcohol (PVA), a water-soluble synthetic highpolymer, was suitable for digestibility studies as a marker with rabbit. Rabbits were fed the diet containing 2% PVA and 1% chromic oxide (Cr2O3) and the fecal excretion pattern of markers was observed for 15 consecutive days. Results obtained are as follows. 1. When coprophagy was prevented, the concentrations of PVA and Cr2O3 in the soft feces were 10.09±0.60% and 1.64±0.0400%, and those in the hard feces were 0.47±0.11% and 2.28±0.09%, respectively. The variation of excretion of both indicators was not so great. Total recoveries of PVA and Cr2O3 were 92.50% and 99.8%, respectively. Ninety-three% of total PVA and 72% of total Cr2O3 were excreted in soft feces and hard feces, respectively. 2. When coprophagy was permitted, the concentration of Cr2O3 was 2.45±0.09% and reached to a plateau at 5 days after the initial feeding of the marker-containing diet. Recovery of Cr2O3 was 96.3%. The concentration of PVA, however, did not reach to a plateau even after 15 days of feeding and increased gradually. It was suggested from the above results that PVA is not applicable to digestion studies with rabbits.
公益社団法人日本畜産学会の論文