* The biological mother is unable to care for the foal: This could be due to illness, injury, death, or even simply not having enough milk.
* The foal needs special care: If a foal is premature, weak, or has a health condition, a nurse mare can provide the specialized care and attention it needs.
* Breeders use it for specific goals: Breeders might use a nurse mare for specific breeding strategies, such as fostering a foal onto a mare with a different breed or bloodline.
* It can be used for training: Some breeders use nurse mares to train their foals to accept humans and other horses, as the mare's behavior and training can influence the foal's development.
It's important to note: The practice of using nurse mares is a complex one with ethical considerations. The well-being of both the nurse mare and the foal must be prioritized. Proper matching, careful monitoring, and good husbandry are crucial for the success of this practice.