5Chew B P. Role of carotenoids in the immune response [J]. J Dairy Sci,1993,76(9) :2804-2811.
6Rajiv C, Harjit K. Plasma antioxidant vitamin status of periparturient cows supplemented with ot-tocopherol and 13-carotene[ J]. Anim Feed Sci and Technol,2004,114 ( 1/2/3/4 ) : 279-285.
7Bendich A. Beta-carotene and the immue response [ J 1. Proc Nutr Soc,1991,50(2) : 263-274.
8Britton G. Structure and properties of carotenoids in rela- tion to function[ J]. FASEB J, 1995,9 ( 15 ) : 1551-1558.
9Blumberg J B. Consideration of the scientific substantia- tion for antioxidant vitamins and beta-carotene in disease prevention [ J]. Am J Clin Nutr, 1995, 62 ($6): 1521-1526.
10Khopde S M,Priyadarsini K I, Mukherjee T, et al. Dose- carotene rotecemembrane lipids from nitrogen dioxide [J]. Free Radic Biol Med,1998,25(1) :66-71.