Heat Taking Toll on Midwest Cattle, Farmers

Another driver for inflation.

Hoosier AG Today, June 29, 2026:

The combination of ambient temperatures nearing the upper 90s and high relative humidity creates a dangerous threshold for farm animals. Unlike humans, cattle and pigs cannot sweat efficiently to dissipate heat, relying instead on heavy respiration and panting.

When the Temperature-Humidity Index (THI) reaches extreme levels, animals cross into a state of acute heat stress. For beef and dairy producers, the consequences are immediate and long-lasting:

• Production Drops: Overheating forces cattle to reduce their feed intake to limit internal metabolic heat production, resulting in immediate drops in milk yields for dairy operations and slower weight gain for feedlot beef cattle.
• Fertility Risks: Prolonged multi-day heatwaves drastically reduce conception rates in breeding herds, often causing early embryonic death that goes unnoticed until autumn pregnancy checks.
• Mortality Hazards: Heavy cattle nearing market weight and young calves are particularly vulnerable.Without continuous airflow from industrial fans and access to clean, cooled water, body temperatures can easily exceed a cow’s normal threshold of 102 degrees Fahrenheit, leading to respiratory failure.

Veterinary extensions are urging producers to suspend all non-essential herd handling, sorting, or livestock transportation until the heat dome shows signs of fracturing.

Below, impact on corn and soybeans – “the Real damage comes from the hot nights.”