Several different things might be occurring. First, mastitis might have set into the udder. A veterinarian can diagnose and treat this bacterial infection. Second, she may be consuming endophyte-infected fescue. The fungus from the endophyte produces chemicals that reduce the secretion of the hormone prolactin. Prolactin is necessary to stimulate the production of milk. Finally, this could also be a genetic or inheritable trait that may or may not occur every time she calves. Contact your veterinarian and have her looked at for a proper diagnosis.

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