Weaning is the most severe stress after the piglets are born. Piglets don't get nutrition from milk again during the period, resulting in gastrointestinal dysfunction easily due to sudden changes of physiology and environment state, showing that villus atrophy, crypt hyperplasia, enzyme activity of digestive tract and immunological function decline, and will induce syndrome associated with early weaning: appetite decline, growth retardation and diarrhea. According to the characteristic of piglets' growth an...
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