1Pierre S, Cobanov B, Schnitkey G. Eco- nomic losses from heat stress by US live- stock industries. Journal of Dairy Science, 2003, 86 ( E Suppl. ) : E52-E77.
2Tao S, Dahl G E. Invited review; Heat stress effects during late gestation on dry cows and their calves. Journal of Dairy Sci- ence, 2013, 96(7) : 4079-4093.
3Tao S, Monteiro P, Thompson I M, et al. Effects of late-gestation maternal heat stress on growth and immune function ofdairy calves. Journal of Dairy Science, 2012, 95 ( 12 ) : 7128-7136.
4Nardone A, Lacetera N, Bernabucci U, et al. Composition of colostrum from dairy heifers exposed to high air temperatures during late pregnancy and the early post- partum period. Journal of Dairy Science, 1997, ~0 ( 5 I : 838-844.
5Rhoads M L, Rhoads R P, Van Baale M J, et al. Effect of heat stress and plane of nutrition on lactating Holstein cows: I ~ Production, metabolism, and aspects of circulating somatotropin. Journal of Dairy Science, 2009, 92(5) : 1986-1997.
6West J W. Effects of heat-stress on pro- duction in dairy cattle. Journal of Dairy Sci- ence, 2003, 86(6) : 2134-2144.
7West J W. Nutritional strategies for manag- ing the heat-stressed dairy cows. Journal of Animal Science, 1999, 77 ( Suppl 2 ) : 21-35.
8Wheelock J B, Rhoads R P, Van Baale M J, et al. Effects of heat stress on en- ergetic metabolism in lactating Holstein cows. Journal of Dairy Science, 2010, 93 (2) : 644-655.
10Schneider P L, Beede D K, Wilcox C J, et aL Influence ol dietary sodium and po- tassium bicarbonate and total potassium on heat-stressed lactating dairy cows. Journal of Dairy Science, 1984, 67 ( 11 ) -. 2546-2553.
3Berman A Y, Folman M, Kaim M, et al. Upper critical temperatures and forced ventilation effects for high-yielding dairy cows in a subtropical climate [J]. J Dairy Sci, 1985, 68: 1488-1495.
4Finch V A. Body temperature in beef cattle: its control and relevance to production in the tropics[J]. J Anita Sci, 1986(62): 531-542.
5Saiady M Y, Shaikh M A, Mufarreja S I, et ol. Effect of chelated chromium supplementation on lactation performance and blood parameters of Holstein cows under heat stress [J ]. Anim Feed Sci Technol, 2004, 117: 223-233.
6Bryant J R, Lopez-ViUalobos N, Pryce J E, et o1.. Environmental sensitivity in new zealand dairy cattle[J]. J Dairy Sci, 2007, 90: 1538-1547.
7Soliman E, Abol E1-Moty A, Fahmy S, et ol. Some physiological responses of lactating Friesian cows to dietary fat supplementation [J]. Alex J Agric Res, 2001, 46: 21-29.
8NRC. Nutrient Requirements of Dairy Cattle[M ]. 6rev. ed. Washing- ton, DC: National Academy Press, 1989.
