2Tao S, Dahl G E. Invited review: Heat stress effects during late gestation on dry cows and their calves [J]. Journal of dairy science, 2013, 96(7): 4079-4093.
3Schaller L K, Burfeind O, Heuwieser W. Impact of heat stress on conception rate of dairy cows in the moderate climate considering different temperature - humidity in- dex thresholds, periods relative to breeding, and heat load indices [J]. Theriogenology, 2014, 81 (8) : 1050 - 1057.
4Cook N B, Mentink R L, Bennett T B, et al. The E{fect of Heat Stress and Lameness on Time Budgets of Lacta- ting Dairy Cows [J]. Journal of Dairy Science, 2007 (90) .. 1674-1682.
5Dikmen S, Hansen P J. Is the temperature-humidity in- dex the best indicator of heat stress in lactating dairy cows in a subtropical environment[J]. Journal of Dairy Science, 2009(92) ..109-116.
