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Heat stress can greatly impact cattle producers through decreased milk production and subsequent calf growth, decreased reproductive performance in cows and bulls, and decreased stocker and feeder performance. It has been estimated that heat-related events in the Midwest have cost the cattle industry over $75 million in the past 10 years.

Rains and normal temperatures into June have taken some of the sting out of the memories of last summer's drought. For cattle kept during the summer of 1998, many of the effects of heat stress were...