In pig production, daily gain commonly used to measure the health and growth performance of weaned piglets. At weaning, the piglets is subjected to myriad of stressors ( the diet change, separation from mother and littermates, new environment and so on) which cause reduced daily gain. Associated with weaning are marked changes the histology and physiology of the intestinal, such as villous atrophy, crypt hyperplasia and increased permeability of the intestinal mucosa, which cause decreased digestive and absorptive capacity, immune functional decline, contribute to post-weaning diarrhoea and po...
