80-day-old piglets bite on the railing

A customer's 80-day-old pig bites the railing after feeding. What is the cause? please answer. Thank you! The main causes of pica may be environmental discomfort (high density or humidity, etc.), dietary nutritional imbalance (calcium and phosphorus content and ratio, trace elements, etc.). Stereotyped behavior gives him toys, such as tires, chains and other molars qdet at 18:42 on 2009-11-30 to add the following or bedding grass-- giving chains does not work well On the contrary, old tires work-it is said that it is good for cans of stone to fall off and arch him.