What do you want to know about heat stress in dairy cows?

It’s already May and the temperatures are rising in the Northern Hemisphere. In April, we have had 2 weeks over 28 degrees C and it’s guaranteed that hot weather is to come. Cows show heat stress from a Temperature Humidity Index of 65 (Bernabucci U.) and from there, milk volume, Dry Matter Intake and reproduction will ALL be affected. Do you know what priorities to apply on farms? When and where to place fans; what about sprinklers? What droplet size should you advise? What are the production and repro effects?


Bernabucci U., Biffani S., Buggiotti L., Vitali A., Lacetera N., Nardone A.,. 2014. “The effects of heat stress in Italian Holstein dairy cattleā, .” Journal of Dairy Science 471-486.
Bernabucci U., Lacetera N., Baumgard L.H., Rhoads R.P., Ronchi B., Nardone A. 2010. “Metabolic and hormonal acclimation to heat stress in domesticated ruminants.” Animal 4 (7): 1167-1183. ff ff