Effects of Feed Additive Bacillus subtilis and Diet Protein Levels on Digestive Organs of Early-Weaned Piglets

[Objective] The aim was to study the effects of the feed additive Bacillus subtilis and diet protein levels on the growth performance and digestive organs of early-weaned piglets.[Method] Three hundred and sixty piglets at weaning age of 21 days were assigned four treatment groups.The diet protein level of group 1 and 2 piglets was 20%,and that of group 3 and 4 was 18%.The feed additive Bacillus subtilis was used in the diets of group 2 and 4.The growth performance and digestive organs of early-weaned piglets were determined.[Result] Group 2 piglets fed Bacillus subtilis had higher(P0.05) average daily gain than those of group 1 and 3 during 14 days of this experiment.For the relative weights of the duodenum and jejunum mucosa and liver,group 4 was higher than group 1,and group 2 and 3 were no difference(P0.05).[Conclusion] The feed additive Bacillus subtilis could enhance the digestive organ development of the small intestine and liver,which improved the growth performance of early-weaned piglets.