Heat Stress Management Becomes Critical for UK Dairy Farmers
With the UK's climate becoming increasingly unpredictable, dairy farmers are advised to prepare for the rising threat of heat stress affecting their herds. Dr. Alison Bond, Technical Services Manager at Rumenco, emphasizes the importance of mitigating the negative impacts of heat stress, which include reduced milk yields, increased mastitis, and elevated somatic cell counts (SCCs).
Dr. Bond explains that heat stress in cattle is gauged using the Temperature Heat Index (THI), which combines temperature and humidity. When the THI reaches 68, cows experience discomfort and performance issues, occurring at temperatures as low as 22°C. One primary effect is decreased appetite, leading to lower dry matter intake and potentially sub-optimal rumen conditions.
Studies have shown that cows under heat stress can experience a milk yield reduction of up to 20%, along with fertility issues and a weakened immune system. To tackle these challenges, Dr. Bond suggests the use of nutritional supplements such as yeast cultures and Refined Functional Carbohydrates (RFCs), which have demonstrated benefits in maintaining cow performance under heat stress conditions.
One product, Celmanax, which combines yeast culture with enzymatically hydrolysed yeast cell wall complexes, has been studied in over 700 Holstein cows. Results showed a consistent increase of 1.2kg of milk per day over 120 days for cows receiving Celmanax compared to a control group. In another study involving crossbred cows in tropical conditions, improvements in udder health and reduced somatic cell counts were noted.
Rumenco offers Celmanax in 20kg bags for inclusion in total mixed rations or as a top-dressing feed. The company also integrates Celmanax into its Maxx Calf Health and Maxx Cattle Booster Plus buckets. Free access to supplementary feeding blocks or buckets during extreme heat is advised to provide essential nutrients, stimulate saliva production, and improve rumen function.
Dr. Bond underlines the importance of ensuring cows have ample access to clean and cold water, and suggests the use of sprinklers for housed cows or in collecting yards. She stresses the importance of monitoring higher-yielding cows for signs of heat stress, as they are more susceptible to its effects.
