Abd Eldaim, M.A., Kamikawa, A., Soliman, M.M., Ahmed, M.M., Okamatsu-Ogura, Y., Terao, A., Miyamoto, T., Kimura, K (2010) Retinol binding protein 4 in dairy cows: its presence in colostrum and alteration in plasma during fasting, inflammation, and the peripartum period. J Dairy Res. 77: 27-32.
Arnett, A.M., Dikeman, M.E., Daniel, M.J., Olson, K.C., Jaeger, J., Perrett, J. (2009) Effects of vitamin A supplementation and weaning age on serum and liver retinol concentrations, carcass traits, and lipid composition in market beef cattle. Meat Sci. 81: 596-606.
Fonnesbeck, P.V., Lydam, R.K. (1998) Digestibility of the proximate nutrients of forage by dairy cattle. J Anim Sci. 26: 1039.
Ghadrdan Mashhadi, A., Taghipour Bazargani, T., Bokaie, S., Poorkabireh, M.A. (2003) Seasonal changes of vitamin A and beta-carotene levels of serum and liver in Holstein cows. Acta Vet Scand. 44:7.
George, L.W. (1996) Vitamin A deficiency in large animal internal medicine. Smith, B.P. (ed.). (2nd ed.) Mosby company, Missouri, USA. p. 1064-1067.
Inove, M. (1992) Changes in serum vitamin A and vitamin E and selenium and lipid components and blood glutathione peroxidase activity during growth stage of Holstein calves. Vet Bull. 62: 2844.
Katamoto, H., Yamada, Y., Nishizaki, S., Hashimoto, T. (2003) Seasonal changes in serum vitamin A, vitamin E and β-carotene concentrations in Japanese Black Breeding cattle in Hyogo prefecture. J Vet Med Sci. 62: 1001-1002.
LeBlanc, S.J., Herdt, T.H., Seymour, W.M., Duffield, T.F., Leslie, K.E. (2004) Peripartum serum vitamin E, retinol, and beta-carotene in dairy cattle and their associations with disease. J Dairy Sci. 87: 609-619.
Mason, C.S., Buxton, D., Gartside, G.F. (2003) Congenital ocular abnormalities in claves associated with maternal hypovitaminosis A. Vet Rec. 16: 213-214.
McDonald, P., Edwards, R.A., Greenhal, J.F.D., Morgan, C.A., Sinclair, L.A. (2001) Animal Nutrition. (7th ed.) Prentice hall publisher, New Jersey, USA.
Molokwu, E.C.L. (1987) Seasonal changes in bovine and caprine blood chemistry and hepatic vitamin in savanna zone of Nigeria. Brit Vet J. 134: 493- 500.
Moore, T. (1930) Vitamin A and carotene: The absence of the liver oil vitamin A from carotene. VI. The conversion of carotene to vitamin A in vivo. Biochem J. 24: 692-702.
National Research Council (2001) Nutrient Requirements of Dairy Cattle, Subcommittee on Dairy Cattle Nutrition, Committee on Animal Nutrition. (7th ed.) The Natinal Academies Press, Washington, D.C., USA. p. 234- 238.
Noziere, P., Graule, B., Lucas, A., Martin, B., Grolier, P., Doreau, M. (2006) Carotenoids for ruminants: From forages to dairy products, Anim feed sci Tech. 131: 418-450.
Pickworth, C.L., Loerch, S.C., Fluharty, F.L. (2011) Restriction of vitamin A and D in beef cattle finishing diets on feedlot performance and adipose accretion. J Anim Sci. 90: 1866-1878.
Radostits, O.M., Gay, C.C., Hinchclif, K.W., Constable, P.D. (2007) Veterinary Medicine: A Textbook of Diseases of Cattle, Horses, Sheep, Pigs and Goats. (10th ed.) Billiare Tindall, London.
Remillard, R.L., Stem, E., Michel, K.E., Engelking, L.R. (1990) Oral vitamin A supplementation to debilitated cattle during Sahelian dry season. Prev Vet Med. 3: 173-183.
Rezamand, P., Watts, J.S., Hunt, K.M., Bradford, B.J., Mamedova, L.K., Morey, S.D. (2012) Bovine hepatic and adipose retinol-binding protein gen expression and relationship with tumor necrosis factor- α. J Dairy Sci. 95: 7097-7104.
Suzuki, J., Katoh, N. (1990) A simple and cheap method for measuring serum vitamin A in cattle using only a spectrophotometer. JPN J Vet Sci. 6: 1281-1283.