English abstract
Hot weather causes heat stress in dairy cattle. The resultant decrease in milk production and reproductive efficiency can be offset by implementation of a program consisting of cooling through shades, ventilation, evaporative coolers and spray and fans. Corral shade would he consistent to be essential to reduce stress. Feed lane shade will improve dry matter intake and milk production. Holding pen cooling with spray and fans is cost effective, even in moderate climates Shade cooling using evaporative or spray and fans is cast effective, if milk price is competitive to world price. The economic benefit should be determined before installation of equipment to reduce heat stress.
