Heat Stress Management in Dairy Cow
Heat Stress Management in dairy cattle through feeding strategy and general management. These are the international recommendations. This article elaborates heat stress control and heat stress plan. Furthermore, this also highlights the symptoms of heat stress in cows. Besides this, article also focus on the effects of heat stress on cows. Moreover, management of heat stress is possible through feeding management and general management. It includes the recommendations by Dr. Richard Kirkland, Ruminant Nutritionist at Volac Wilmar Feed Ingredients and Dr. Mike Hutjens.
Heat stress is a major challenge for dairy farmers during hot weather, affecting animal welfare, milk production, feed efficiency, health, and fertility. According to Dr. Richard Kirkland, Ruminant Nutritionist at Volac Wilmar Feed Ingredients, identifying heat stress early and combining proper nutrition with effective management practices are essential to minimize production losses.
ہیٹ سٹریس جیسے مسئلے پر خوراک اور مینجمنٹ سے کیسے قابو پائیں؟
عالمی ماہرین کا میڈیا کو جاری بیان
بھینسوں میں ریپروڈکشن سے متعلقہ مسائل پر گفتگو
مشیگن سٹیٹ یونیورسٹی میں بائی پاس فیٹ میں فیٹی ایسڈز کے تناسب کے حوالے سے نئی تحقیق
جانوروں کو شدید گرمی سے کیسے بچایا جائے ،محکمہ لائیوسٹاک کا خصوصی پیغام
Heat stress is a major challenge for the dairy industry, affecting the health, milk production, reproduction and overall performance of dairy animals. According to global experts, heat stress occurs when animals are unable to effectively dissipate the heat generated in their bodies.
Dr. Kirkland explains that heat stress can start at temperatures around 25°C, but humidity plays a critical role. High humidity reduces the cow’s ability to dissipate body heat through sweating and panting, meaning cows may experience heat stress even when temperatures are only in the low 20s.
Symptoms of Heat Stress
According to Dr. Mike Hutjens, Professor and Researcher at the University of Illinois, heat-stressed cows show several visible signs, including:
- Spending more time standing and seeking shade
- Gathering together when shade is limited
- Increased breathing rate
- Panting in severe cases
Dr. Hutjens notes that a breathing rate above 60 breaths per minute indicates heat stress, while rates can reach 80–90 breaths per minute during severe heat load.
- Increased respiratory rate
- Increased body temperature
- Increased water consumption
- Decreased feed intake
- Decreased milk production
- Decreased reproductive performance
- Control heat stress with better management
Heat stress affects production and health
According to experts, heat stress reduces the dry matter intake of animals, which leads to energy deficiency. This results in reduced milk production, reduced body weight and reproductive problems.
Heat stress significantly affects dairy performance. Dr. Kirkland reports that:
- Dry matter intake can decline by 20–40%
- Energy requirements increase by up to 25%
- Milk yield may decrease by as much as 35%
- Conception rates can fall to 10% during the hottest months
Dr. Hutjens adds that heat stress can also reduce milk fat and protein levels, increase the risk of lameness, lower rumen pH, and even result in smaller calf birth weights.
Recommendations by Experts for Heat Stress Management
International experts have recommended the following measures to prevent heat stress:
- Animals should be provided with clean and cool water at all times.
- Proper ventilation and fans should be arranged in sheds.
- Shaded environment should be provided to animals.
- Feeding times should be kept in relatively cool areas, i.e. morning and evening.
- A balance of energy and nutrients should be maintained in the diet.
- Overcrowding should be avoided.
Importance of dietary strategy in Heat Stress Management
According to experts, the nutritional needs of animals change during the summer season. Therefore, ingredients that meet energy needs and maintain gastrointestinal health should be included in the diet. Adequate minerals, vitamins and quality feed play an important role in maintaining good animal performance.
Global experts say that heat stress is not just a weather problem but a major challenge affecting the economic performance of dairy farms. This problem can be effectively controlled only through better feeding, proper management, cool environment and constant monitoring.
Energy-Dense Diets in Heat Stress Management
Because heat-stressed cows consume less feed, Dr. Kirkland emphasizes the importance of increasing the energy density of the ration. He recommends:
- Feeding high-quality, highly digestible forages
- Using digestible fiber sources such as sugar beet pulp
- Avoiding poor-quality forages that generate more internal heat during digestion
- Supplementing diets with rumen-protected fats
According to Dr. Kirkland, rumen-protected fats such as Megalac provide concentrated energy without increasing rumen acid production, making them especially valuable during hot weather when feed intake is reduced.
