Brazilian climatic conditions are highly unfavorable for European dairy cows breeds due to the difficulties in adapting to thermal comfort, leading to direct losses in milk production. The development of new technologies is needed in order to permit a better expression of the animal's genetic potential. The knowledge of the dairy cows response to adequate environment may improve milk production. However, the misuse of unappropriate solutions of cooling equipment can lead to the increase in production costs. The experiment was carried out at the Paraíso Farm in the municipallity of Santo Antonio do Jardim, SP, where 470 cows in lactation were used distributed in 6 lots, and analyzed in two periods from September to November, 2000 (T1) and September to November, 2001 (T2), without climatization and with climatization, respectively. The objective of this research was to analyze the physical housing environment of dairy cows housed in free-stall system using the thermal comfort indexes (THI) and (WBGT). The obtained results of average THI and WBGT for the group (T2) with climatization was better when compared with the group (T1) without climatization. The conclusion was that both THI and WBGT were better and satisfactory for the group with cooling equipments.
thermal comfort; thermal environmental indexes; dairy cows
