1. Berbigier P (1988) Bioclimatologie des ruminants domestiques en zone Tropical. INRA, Paris
2. Bianca W (1961) Heat tolerance in cattle. Int J Biometeorol 5:5?26
3. Blood DC, Rodostits OM, Henderson JA, Arundel JH, Gray CC (1983) Veterinary medicine. A text-book of the diseases of cattle, sheep, pigs, goats and horses, 6th edn. Bailliere Tindall, Eastbourne, pp 655?657
4. Hafez ESE (1968) Adaptation of domestic animals. Lea and Febiger, Philadelphia
5. Igono MO, Johnson HD (1990) Physiologic stress index of lactating cows based on diurnal pattern of rectal temperature. J Interdiscipl Cycle Res 21:303?320