1Sohal R S,Allen R G. Oxidative stress as a causal factor in dif- ferentiation and aging:a unifying hypothesis [J].Exp Gerontol, 1990, 25 (6) :499-522.
7Koopmans S J,Guzik A C, et al. Effects of supplemental L- tryptophan on serotonin, cortisol, intestinal integrity, and behav- ior in weaning piglets[J].J Anim Sci, 2006, 84 (4):963-971.
8Guzik A C, Matthews J O, Kerr B J, et al.Dietary tryptophan ef- fects on plasma and salivary cortisol and meat quality in pigs [J]. J Anim Sci, 2006, 84 (8):2251-2259.
9Zhan Z, Ou D, Piao X, et al.Dietary arginine supplementation affects microvascular development in the small intestine of early-weaned pigs [J].The Journal of Nutrition,2008,138: 1304-1309.
