As temperatures rise during the summer months, heat stress can become a growing concern for dairy farmers. While much of the focus is often on maintaining milk yield, high temperatures can also have an impact on milk quality and overall herd health.
When cows experience heat stress, they naturally reduce their feed intake to help regulate their body temperature. Eating less means they may consume fewer nutrients, which can affect milk production and composition. However, reductions in butterfat commonly seen in Irish dairy herds during the summer months should not be attributed to heat stress alone. Factors such as stage of lactation, genetics, diet and seasonal changes can also influence milk fat and protein levels. Maintaining milk solids is particularly important where they are a key driver of milk payment.
Heat stress also places additional strain on a cow’s immune system. As a result, cows may become more susceptible to health issues. For example mastitis, which can increase somatic cell counts (SCC) and reduce milk quality. Elevated SCC can impact milk price and indicate underlying herd health problems that require attention.
Providing cows with constant access to clean, fresh water is one of the most effective ways to minimise the effects of hot weather. A high-producing dairy cow can drink over 100 litres of water per day during warm conditions. Adequate water supply essential. Shade, good airflow and well-ventilated housing also play an important role in helping cows stay cool and comfortable.
Nutrition should also be carefully managed during periods of high temperatures. Feeding during the cooler parts of the day and ensuring cows have access to a balanced, high-quality diet can help maintain dry matter intake and support milk production and quality.
While Irish summers can be generally mild, periods of prolonged heat like we are currently experiencing can still affect dairy herds. By recognising the signs of heat stress early and implementing practical management strategies, farmers can help protect both animal welfare and milk quality throughout the warmer months.
Want to build your skills and confidence in milking? FRS Training’s Best Practice in Milking course provides practical training to help you develop the skills needed for safe, efficient and high-quality milking. Click here for more information.
Need a break from milking? FRS Farm Services can provide experienced relief milkers to help keep your farm running smoothly while you take time away. Find her local office here.
