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Their sense of smell, while much better than that of humans, is not quite as good as that of a dog. It is believed to play a key role in the social interactions of horses as well as detecting other key scents in the environment. Horses have two olfactory centers. The first system is in the nostrils and nasal cavity, which analyze a wide range of odors. The second, located under the nasal cavity, are the Vomeronasal organs, also called Jacobson’s organs. These have a separate nerve pathway to the brain and appear to analyze pheromones.
A horse’s hearing is good, and the pinna of each ear can rotate up to 180 °, giving the potential for 360 ° hearing without having to move the head. Noise world the behavior of horses and certain kinds of noise may contribute to stress: A 2013 study in the UK if that stabled horses were calmest in a quiet setting, or listening to country or classical music, but displayed signs of nervousness when listening to jazz or rock music. This study also recommended keeping music under a volume of 21 decibels. An Australian study found that stabled racehorses listening to talk radio had a higher rate of gastric ulcers than horses listening to music, and racehorses stabled where a radio was played had a higher overall rate of ulceration than horses stabled where there was no radio playing.