1. Abe, K. et al. (2016) The new functions and safety of vitamin E. Vitamins: Journal of the Vitamin Society of Japan, 90, 290-292 [In Japanese].
2. Agriculture, Forestry and Fisheries Research Council Secretariat (1999) Nutrition requirement. In ed. Ministry of Agriculture, Forestry and Fisheries, Japanese Feeding Standard for Dairy Cattle. Central Association of Livestock Industry, Tokyo, Japan, pp. 105-187 [In Japanese].
3. Aketagawa, H. et al. (1994) Effect of β-carotene and vitamin A in bovine serum on embryo recovery. Bull. Niigata Anim. Husb. Exp. Stn., 10, 15-22 [In Japanese with English summary].
4. Albanes, D. et al. (1996) Alpha-Tocopherol and beta-carotene supplements and lung cancer incidence in the alpha-tocopherol, beta-carotene cancer prevention study: effects of base-line characteristics and study compliance. J. Natl. Cancer Inst., 88, 1560-1570.
5. AOAC International, Carotene in fresh plant materials and silages (2000) Official methods of analysis (17th edition). In ed. Horwitz W., MD: AOAC International, Gaithersburg, USA, 45, pp. 45-46.