Heat stress is a challenge many dairy operations face, particularly during the summer and fall months. When temperatures rise and humidity increases, livestock are forced to adapt to try to cope with the heat. This can lead to a wide range of health and productivity issues.

Impacts of heat stress on dairy cows extend beyond immediate milk production. Maternal heat stress in utero affects fetal development, leading to compromised growth, immune function and long-term productivity in offspring.

Based on my last 14 years studying cow behavior, three specific areas rise to the top of my list for improving cow comfort. If these three tips are addressed on your farm, your cows are or will be rewarding you with fewer cases of disease and an increase in milk production.

A potential consequence of the dual hutch housing system is that when calves choose to share a hutch, this could increase the risk of heat stress during warm weather. We conducted a study at the University of Wisconsin – Madison to see if this concern is warranted and to measure how calves use hutch ventilation.

As the temperatures soar, managing heat stress in dairy and beef calves becomes key for ensuring the health and future productivity of the herd. Heat stress not only affects the immediate well-being of the animals but can also have long-term implications for their growth and development. 

This article, from researchers from the University of Wisconsin, discusses a study that aimed to examine the genetics of milk yield consistency within and between lactations of U.S. Holstein cows.