The combination of heat and humidity can compromise a cow’s ability to get rid of excess body heat. Cooling systems and heat abatement programs are important, but even with routine summertime diet and cooling techniques in place, a cow can experience physiological changes with which she cannot cope.
Source: Dairy Herd Management, June 28, 2016.
Link to TechMix – Dairy Heat Stress. Heat stress can elevate core body temperature, impairing reproductive cells during development and lead to cell death loss. The outcome of high THI and high body temperature results in reduced conception rates. New studies show BlueLite®, a research-proven balance of nutrients fed during heat stress, helps to reduce body temperatures and support reproduction.