Abstract
The overall results of the work carried out at CTVM show that still not enough is known about the control of lactation in dairy cows in hot conditions. More specifically it is not known how much of the reduction in milk yield is due to hot conditions alone and how much improved management, nutrition and health could overcome reduced production. Further, while we have gone some way towards understanding the hormonal control of temperature regulation and the interactions between temperature regulation and productive processes, we are still not in a position to accurately and predictably manipulate the hormonal mechanisms to alleviate the effects of heat stress. It is apparent from this work that the reduction in milk yield seen in dairy cattle in hot environments is not the result of a simple process and that our understanding of the causes and effects is not complete.
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