4HURLY W L ,DOANE R M. Recent development in the role of vitamins and minerals in reproduction[J]. J Dairy Sci, 1989,72:784 - 804.
5ALl A, EZZO O H, E1 - EKHNAWY K E. Effect of zinc supplementation on reproductive performance of Barki ewes under practical field condition[J]. Vet Med J Giza,1998,46: 77-87.
6SMITH O B, AKINBAMIJO O O. Micronutrients and reproduction in farm animals[J]. Anim Repro Sci, 2000,60 - 61 : 549- 560.
7ARECHIGA C F, ORTIZ O, HANSEN P J. Effect of prepartum injection of vitamin E and selenium on postpartum reproductive function of dairy cattle[J]. Theriogenology, 1994,41:1251 - 1258.
8MARRIN - GUZMAN J, MAHAN D C, LPATE J. Effect of dietary selenium and vitamin E on spermatagenic development in boars[J]. J Anim Sci, 2000,78: 1537- 1543.
9HANSEN J C, DEGUCHI Y. Selenium and fertility in animals and man - a review[J]. Acta Vet Scand, 1996,37:19 - 30.
10MERIN - GUZMAN J, MAHAN D C. Effects of dietary selenium and vitamin E on performance and tissue respormes, semen quality and subsequent fertilization rates in mature gilts[J]. J Anita Sci, 1997,75:2994- 3003.
