What makes a pig in the mud very happy. Mud baths certainly keep pigs cool, a newly published research review finds, but wallowing may also be a sign of well-being in swine.
And since few farmers provide their swine with mud pits, wallowing may be an animal health welfare.
The strongest motivation for wallowing seems to be temperature regulation. Pigs have few sweat glands, high body fat and a barrel-shaped torso that stores heat. Wallowing can lower a pig’s temperature by 3.6 degrees Fahrenheit (2 degrees Celsius), making it more efficient than sweating would be even if pigs had lots of sweat glands. A mud bath is more cooling than a dip in cold water because the water in mud evaporates off the pig’s coated body more slowly, allowing the animal to reap the cooling benefits of evaporation for longer.
But even in cool weather, pigs still wallow, suggesting that the magic of mud doesn’t just lie in thermal regulation. Some wild pigs seem to use mud baths to scrape off parasites such as ticks and lice; they may also rub their scent glands around wallowing areas, possibly as a way of territory marking.
Farmers shouldn’t think that they can replace wallowing with air-conditioned barns and anti-parasite medicines.
This could involve a repetition of the mistake made by animal scientists and farmers who previously suggested that farm animals do not need to forage (search for food) when they are provided with nutritious food. That view has lead to serious welfare problems such as tail biting.
In other words, the simple enjoyment of natural behaviors might factor into the “good life” for farm animals. Progressive farmers may need to consider providing pools or showers for pigs to accommodate such a demand.
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