Abstract
The decreasing of milk yield caused by stress has been related to cellular changes and apoptosis in the mammary gland, modulated by action cortisol, insulin, prolactin (PRL), growth hormone (GH) and insulin-like growth factor 1 (IGF-1). By other way, some authors suggest that chaperones can interact with the cellular receptors of cortisol, PRL, GH, insulin and IGF-1 in other tissues, play…