Summertime heat and humidity have a large impact on cow comfort and milk  production.   Research has shown that temperatures above  71° C and relative humidity higher than 60% will cause a noticeable rise in the body temperature of cows.This heat stress in cows will first show up in reduced feed intake, quickly followed by a drop in milk production.  Some research reports suggest that drops in milk yield of 20-30% following heat stress are not uncommon in high- producing herds. In addition to these adverse affects, heat stress negatively impacts the reproductive health of cows.

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