5[7]Newby T J, Haresign W and Cote DTA. Recent advances in Animal Nutrition [M]. London Butterworths, 1984.49-59.
6Mahan D C.Assesment of the infulence of dietary vitamin E on sows and offspring in three parites:Reproductive performance ,tissue tocopherol,and effects on pregeny [ J].J. Anim. Sci.1991,69:2904-2917.
7Wuryastuti H.Stowe H D,Bull R W,etal.Effects of vitamin E and selenium on immure responses of peripheral blood,colostum and milk leukocytes of sows [ J ] .J Anim. Sci. 1993,71:2464-2472.
8W.L. Flowers. New ideas on boar and sow fertility examined[J].Feedstuffs, 1998.
9Xue J L, DLJohnson. J. Anim. Sci., 1998, 76: 2962.
10Dourmad J Y, M Etienne, J Noblet, et al. J. Anim.Sci., 1996, 74:2211.
