ラットによる含水糞の喰糞行動

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There are unanswered questions regarding coprophagy (fecal matter reingestion) of rats, and this work attempted to obtain the differences between the reingest feces and others. The period of coprophagy was first determined with 7 rats, 10 weeks of age, in a series of behavior observations. They showed a specific posture during the reingestion of feces, and about 68% of this behavior occurred in the dark-period. This specific posture was recognized as coprophagy by anatomical observation of stomach contents using fasting rats. Feces expelled by coprophagy-prevented and allowed rats were also classified by their character, color, smell and hardness, and we learned there were at least two types of feces. One of them was an usual type and the other was only collected from coprophagy-prevented rats, therefore, it seemed that the specific feces were always reingested by a donor that could move about freely. These two fecal types reacted differently in the ninhydrin test. The results of chemical composition analysis showed that the water content and crude protein value in dry matter of the specific feces was higher than that from usual feces. This means that rats expel at least two types of feces as do rabbits; specific feces were thoroughly reingested by the donor in each case. The character of this specific feces examined by ninhydrin reaction differed from that in rabbits, and thus we called it "hydrous feces" in contrast to the "soft feces" from rabbits. Jpn. J. Livest. Management, 32(3) : 91-98,1997. Received September 11,1996. Accepted January 14,1997.
日本家畜管理学会の論文
1997-03-07

ラットによる含水糞の喰糞行動

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