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This is a medical condition in mares where they show excessive sexual behaviors, such as showing receptiveness. Nymphomania is caused by either persistent ovarian follicles or granulosa cell tumors. The tumor must be surgically removed, whereas the follicles can be treated with hormones or may just resolve on its own. Source: Merck Vet Manual

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This is where certain mares will exhibit signs of being in heat, without actually entering that point in the estrous cycle. Source: Merck Vet Manual.

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According to Merck Vet Manual, mares can have several issues with breeding behaviors, one of which is called "silent heat". This means that the mare's reproductive tract appears to be healthy and fertile; however, upon breeding, the mare will not accept the stallion to be bred. This can be common in young mares, who are entering their first estrous cycle. Some factors that may play a role in silent heat include environment and preference of mates.

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This image shows a stallion smelling a mare to see if she is in heat, and if she is going to be receptive of him. Source: Google Images.

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According to Merck Vet Manual, almost 50% of all geldings continue to exhibit stallion-like behaviors. Some of these behaviors include, but are not limited to, mounting mares, Flehmen response, and aggression.

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Stallions can become extremely aggressive during breeding season. This is usually due to overuse of the animal, or if the breeder tries to use the stallion out of normal breeding season. This can eventually lead to poor libido. Source: Merck Vet Manual (see link below).

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By Gary M. Landsberg, BSc, DVM, MRCVS, DACVB, DECAWBM, Director, Veterinary Affairs and Product Development, CanCog Technologies, and Veterinary Behaviourist, North Toronto Veterinary Behaviour Specialty Clinic
Sagi Denenberg, DVM, DACVB, Dip. ECAWBM (Behaviour), MACVSc (Behaviour),

Many behavioral problems are associated with confinement. Under free-ranging circumstances, horses wander and spend >60% of their day foraging. The remainder of their time is spent resting (standing or lying down), grooming, or engaging in another activity. This same pattern is seen under barn conditions; even with free choice of grain, horses will eat many small meals a day. Horses are highly social animals that require contact with others for normal daily maintenance and well-being. Isolating horses can lead to development of problems. The main goal of managing behavior problems in horses is to identify the deviation from normal equine behavior and correct it.

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Behavioral Problems of Horses - Behavior - Merck Veterinary Manual

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By Gary M. Landsberg, BSc, DVM, MRCVS, DACVB, DECAWBM, Director, Veterinary Affairs and Product Development, CanCog Technologies, and Veterinary Behaviourist, North Toronto Veterinary Behaviour Specialty Clinic Sagi Denenberg, DVM, DACVB, Dip. ECAWBM (Behaviour), MACVSc (Behaviour), Many behavioral problems are associated with confinement. Under free-ranging circumstances, horses wander and spend >60% of their day foraging.

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This is a really interesting video sharing behaviors of a mare in estrus. I also learned that mares that would normally show signs of estrus, but have a foal, will become protective of their baby and will not show signs of being in heat. Source: YouTube

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Estrus Behavior in Mares, provided by eXtension

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This video, produced by the University of Nebraska, illustrates the normal behavior of mares in estrus. This video was designed to help educate horse breeders on horse breeding management. This video was sponsored in part by My Horse University (http://www.myhorseuniversity.com) based out of Michigan State University Extension.

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As shared in the book, "horse breeders use artificial light to advance the normal spring breeding season,"(Price, Edward O. Principles and Applications of Domestic Animal Behaviors. Croydon: CPI Group Ltd, 2008. Print).
By beginning the breeding season earlier, it alters the normal "time" of breeding behaviors. Ultimately, it allows for more time to breed and promotion of courtship and mating behaviors.

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This resource discusses the impact diet has on behavior. Check it out!

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Role of Diet and Feeding in Normal and Stereotypic Behaviors in Horses: Discovery Service for Illinois State University

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This article discusses how the coat color can impact the behavior of a horse, how interesting! Source: Miler Library Database.

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The Milner Library proxy server will allow authorized individuals to use the indexes and databases when connecting through a computer off-campus.

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This is the response stallions have when they sense a mare is in heat. This behavior can go along with smelling the mare, and other courtship behaviors as well. Source: Google Images.