When autumn arrives and we see an increase in lame cows within the herd, our immediate reaction is usually to check flooring conditions, cubicle hygiene, or adjust the hoof trimming schedule. However, by then, the real cause has often already been overlooked.
There is a delay of between one and two months between the peak of heat stress in summer and the clinical onset of hoof lesions.
The golden rule: The cows standing in the heat today during summer will be the lame cows two months from now, in autumn.
The real prevention window does not open when lesions are diagnosed in autumn; it opens in summer, when temperatures begin to rise.
🧬 Why does heat stress damage the hooves?
The answer combines cow behaviour with an internal biological storm:
- More standing time, less resting: To dissipate heat, a cow’s natural response is to remain standing, increasing the body surface exposed to the air. When cows spend less time lying down in the cubicles, their body weight remains continuously on the hooves, often on hard concrete surfaces.
- Harmful crowding: Cows desperately seek darker areas or spots with air movement for relief. When they bunch together, pressure on their limbs increases and the temperature of the group rises even further.
- The impact of Leaky Gut: Heat stress redirects blood flow away from the internal organs towards the skin in order to cool the body. This reduces the oxygen supply to the intestine (ischemia), damaging the “cement” that holds its cells together. The gut becomes permeable, like a sieve, allowing toxins and bacteria to enter the bloodstream. As these circulate through the body, they trigger inflammation in the corium—the sensitive tissue within the hoof—weakening the support of the distal phalanx and leading to sole haemorrhages and ulcers several weeks later.
- Acidosis and dehydration: Heat stress reduces feed intake and alters rumination, increasing the risk of Subacute Ruminal Acidosis (SARA). In addition, dehydration can damage the internal soft tissues of the hoof within a matter of hours.
🛠️ 7 Advanced Management Tips to Protect Hooves This Summer
To break this cycle before it is too late, implement these proactive strategies on your farm:
💧 1. Water: The cheapest and most critical nutrient
During hot weather, a cow’s water intake can increase by 20% to 200%. Proper hydration helps maintain the elasticity and health of the internal hoof tissues.
- Key access points: Place clean water troughs at the exit of the milking parlour, in the holding area and within 15 metres of the feed barrier. Ensure a minimum of two water troughs per group.
- The feed trough trick: If you no longer provide concentrate in the milking parlour during summer, seal those troughs and fill them with clean water. This improves cow flow out of the parlour and gives subordinate cows an opportunity to drink without being intimidated by dominant animals.
- Constant flow: Maintain a flow rate that provides at least 7.6 cm of water depth and offer at least 9 cm of linear drinking space per cow.
🌬️ 2. Ventilation vs. Cooling: Learn the difference
Many farmers believe that installing fans solves ventilation problems. This is a common mistake:
- Ventilation exchanges the air inside the building, removing moisture, gases such as ammonia and pathogens, while helping regulate the overall temperature.
- Cooling (fans) simply moves air at high speed over the cow’s back to cool the animal, but does not renew the air if the building is enclosed.
- The summer target: You need an air speed of 1.5 to 2 metres per second at cow level, where cows are lying or feeding, not at roof level. Run fans continuously from 18°C onwards.
🏗️ 3. Correct poor barn design
Many older barns were not designed with adequate ventilation in mind. Small infrastructure changes can make a significant difference without the need for a complete rebuild:
- Maximise air inlets: Open or remove side walls that obstruct natural airflow.
- Avoid the “wind shadow effect”: When buildings are positioned too close together, natural airflow is reduced. In these situations, installing positive-pressure tube ventilation systems (PPTS) can help introduce fresh air directly at animal level.
- Check the roof: Make sure the roof ridge is wide enough to allow hot, humid air to escape upwards through the stack effect.
🚿 4. Combine sprinklers and ventilation (The perfect combination)
Combining water with moving air is the most powerful cooling tool.
- Use large droplets: Install sprinklers in the holding area and along the feed barrier. Droplets should be large enough to soak the skin. Fine mist systems often create a layer of moisture over the hair that traps heat instead of dissipating it.
- Smart cycles: Set the sprinklers to wet the cows for a few minutes and then stop, allowing the fans to evaporate the water before the next cycle.
👥 5. Prevent crowding caused by light or flies
Cows tend to group together not only where it is cooler, but also where light intensity is lower.
- Light management: Close the side curtains of the barn by 80% on the side exposed to direct sunlight, or install shade screens to prevent cows from seeking darker areas.
- Pest control: Flies stress the animals and cause them to bunch closely together for protection. Effective fly control significantly reduces crowding and the amount of time cows spend standing on concrete.
🌾 6. Adjust feeding times and use additives
During summer, cow appetite can drop significantly. To keep cows eating and prevent ruminal pH from falling:
- Feed during cooler hours: Distribute the largest rations during the coolest parts of the day, such as early morning or late afternoon. This keeps the feed fresh and palatable and prevents fermentation at the feed barrier.
- Protected feeding areas: Make sure the feed barrier is provided with shade structures so cows can feed comfortably without direct sunlight on their backs.
- Proactive nutritional support for rumen health: Consult your nutritionist about the inclusion of feed additives such as yeast cultures, live yeasts or rumen stabilisers to help maintain ruminal pH above 5.8, support intestinal integrity and mitigate the feared impact of leaky gut.
🏥 7. Preventive functional trimming and early detection of lameness
Planning is your best ally before the heat arrives:
- Preventive trimming before summer: Make sure hooves are properly balanced before the heat stress season begins. On farms where thin soles are a recurring issue, carry out a very conservative preventive functional trim, as thin soles tend to become more pronounced and experience greater wear during summer (see the Thin Sole blog post). Always discuss this with your trusted hoof trimmer.
- Sharpen your eye (Early detection): We know that autumn will bring an increase in lameness, but if cases are identified subtly and at an early stage, treatment success will increase and economic losses will decrease. This summer, observe the group as they leave the milking parlour and look for these subtle signs (see the Lameness Signs blog post).
📝 Conclusion
Hoof care in summer requires us to look ahead and consider the seasonal timeline. By investing today in an abundant water supply, effective ventilation, preventive trimming and early detection, we can not only maintain immediate milk production but also prevent the costly wave of lame cows that often arrives in autumn.
Prevention does not begin when a cow can no longer walk; it begins with barn design and daily herd management when temperatures start to rise.
