Managing Livestock Heat Stress in Show Season

With temperatures climbing and show season in full swing, it is worth taking a moment to think about how heat affects livestock, and how to manage it sensibly around transport and show preparation.

Why heat affects livestock

Cattle and sheep are homeothermic, meaning they work hard to keep their core body temperature within a fairly narrow, comfortable range regardless of what is going on outside. Cattle sit comfortably at a core temperature of around 38.5 to 39.3°C, while sheep have a similarly stable internal temperature but tend to cope with a slightly wider range of outside conditions, at least until they are carrying a full fleece.
When the weather pushes an animal beyond its comfortable range, the body switches to active cooling: breathing faster, and diverting more blood to the skin surface to shed heat. This works well up to a point, but on hot, humid days those mechanisms can be overwhelmed, and that is when animals become genuinely heat stressed rather than just warm.

Humidity matters just as much as temperature here. A muggy day, or a poorly ventilated trailer or shed, can push an animal into heat stress at temperatures that would otherwise feel unremarkable. This is why cattle standing in a still, humid collecting yard can be under more pressure than the thermometer alone would suggest, and it is worth bearing in mind when planning both transport and penning at shows.

Cattle: what to look out for
Healthy adult cattle breathe steadily and calmly when comfortable. As heat builds, you will typically notice faster breathing first, then heavier breathing with the ribs working harder, and in more serious cases open-mouth panting with the neck extended. Panting of this kind, along with excessive drooling, restlessness or dullness, bunching together, or a reluctance to move, are all signs that an animal needs help now rather than later: shade, water, and airflow as a first response, with veterinary advice sought promptly if things do not improve.

Sheep: a similar picture, with an added complication
Sheep show heat stress in much the same way, faster breathing, seeking shade, going off their feet less, and in severe cases open-mouth panting with an extended neck. The complication with sheep, particularly at shows, is fleece. A full, well-prepared show fleece is excellent insulation, which is exactly the problem in hot weather: it traps heat close to the body and makes it much harder for a sheep to cool itself compared with a freshly shorn animal. Recently shorn sheep tend to cope considerably better in heat, while heavily fleeced show sheep need extra vigilance, more shade, and more generous airflow in their pens than you might otherwise think necessary.

Transport in hot weather
Trailers can get considerably hotter inside than the outside air temperature suggests, especially once loaded and moving slowly or standing still in traffic. A few practical principles go a long way:
• Travel early morning or evening where possible, and avoid the hottest part of the day, roughly late morning through mid afternoon
• Reduce stocking density below what you might normally use, giving each animal more room to lose heat
• Keep stops short, and choose shaded spots if you do need to stop
• Think about fitness to travel beforehand. Animals that are heavily pregnant, very young, or already unwell are far more vulnerable to heat on a journey and may be better left at home in very hot conditions
Consider traffic build up carefully and include likely queues when estimating how long livestock will be in trailers.

 
Settling in and shedding at the show
Once animals arrive, give them time to recover before asking anything of them. A few hours, ideally overnight, allows them to rehydrate and settle before clipping, washing or heavy handling begins. When it comes to penning, resist the temptation to prioritise a smart, tight setup over a well-ventilated, shaded one. A supplementary fan in a shed or line of pens makes a genuine difference.

When it might be better not to travel
There will be days when the kindest decision is to leave an entry at home. If the forecast is for a genuinely hot, humid day with little breeze, if the journey is a long one without the chance to check on animals along the way, or if an animal is already showing any signs of heat stress before it is even loaded, it is worth reconsidering. No rosette is worth an animal's welfare, and most shows will understand a late withdrawal for good reason.

In short
Heat stress is predictable and largely preventable with a bit of forward planning: sensible timing, good ventilation, plenty of water, and an honest assessment of whether an animal is fit to travel that day. Keep half an eye on how your animals are breathing and behaving, both on the road and in the pen, and you will catch problems early rather than late.