* Time of weaning: If the foal is weaned abruptly, the mare may continue producing milk for a few weeks, even months, until her body adjusts.
* Breeder's practices: Some breeders may choose to milk the mare out after weaning to prevent mastitis (inflammation of the udder).
* Hormonal factors: The hormone prolactin is responsible for milk production. Even after weaning, some mares may have higher prolactin levels than others, leading to continued milk production.
* Stress: Stress, including changes in environment, diet, or social interactions, can also influence milk production.
It's important to note: If a mare continues to produce milk for a long time after weaning, it can be uncomfortable for her and could lead to health issues. A veterinarian can help manage this situation by recommending solutions such as milking the mare out or prescribing medications to reduce milk production.