2MAO Xiangbing, ZENG Xiangfang, QIAO Shiyan, et al. Specific roles of threonine in intestinal mucosal integrity and barrier function[J]. Frontiers in Bioscience (Elite Edition), 2011,3(4): 1192-1200.
3GALLO R L, HOOPER L V. Epithelial antimicrobial defence of the skin and intestine [ J ]. Nature Reviews Immunology, 2012, 12(7): 503-516.
4WINTERGERST E S, MAGGINI S, HORNIG D H. Contribution of selected vitamins and trace dements to immune function [J]. Annals of Nutrition and Metabolism, 2007, 51 (4) : 301 -323.
5REN M, ZHANG S - h, ZENG X - f, et al. Branched - chain Amino Acids are Beneficial to Maintain Growth Performance and Intestinal Immune - related Function in Weaned Piglets Fed Protein Restricted Diet[ J]. Asian - Australasian Journal of Animal Sciences, 2015, 28(12): 1742- 1750.
6OSWALD I P. Role of imestinal epithelial cells in the innate immune defence of the pig intestine[J]. Veterinary Research, 2006, 37(3): 359-368.
7GUY -GRAND D, DISANTO J P, HENCHOZ P, et al. Small bowel enteropathy:role of intraepithelial lymphocytes and of cy- tokines (IL - 12, IFN -gamma, TNF)in the induction of epithelial cell death and renewal [ J ]. European Journal of Immunology, 1998, 28(2) : 730 -744.
8NOFRARfAS M, MANZANILLA E G, PUJOLS J, et al. Effects of spray - dried porcine plasma and plant extracts on intestinal morphology and on leukocyte cell subsets of weaned pigs[ J ]. Journal of Animal Science, 2006, 84(10) : 2735 -2742.
9WU G. Intestinal mucosal amino acid catabolism[J]. The Journal of Nutrition, 1998, 128(8) : 1249 -1252.
10ZASLOFF M. Antimicrobial peptides of multiceUular organisms [ J ]. Nature, 2002, 415 (6870) : 389 - 395.