The animal gut morphology is closed related to food habit,food quality and energy demand.The seasonal changes in length and weight of total digestive tract and separate parts of digestive tract in Rattus norvegicus,which lived in add environment of Xinjiang were determined.The results showed that the length of whole digestive and small intestine and large intestine had significant seasonal variations,which were higher in spring and winter than in autumn and summer.We also discovered that the length and weight of stomach of the species captured in Alashankou region had significant seasonal variations.
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