milk fever

  1. Now Rare mild puerperal fever: so called because erroneously attributed to an accumulation of milk in the breasts
  2. a disease often occurring in dairy cows shortly after calving, characterized by a drop in blood calcium, paralysis, etc.

See milk fever in American Heritage Dictionary 4

noun
  1. A mild fever, usually occurring at the beginning of lactation, associated with infection following childbirth.
  2. A disease affecting dairy cows and occasionally sheep or goats, especially soon after giving birth.

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