A common refrain from horse owners and caretakers is that mares become more moody and misbehave more when they are in estrus. A study from the University of California, Davis, investigated whether ...

"72% of the stallions reacted with sexual arousal (mounting) to one of 3 successive simulated sexual stimuli; 25% to a dummy, an additional 44% to a gentle stallion and another 3% to a dummy smeared ...