self-sucker

plural self-suckers

1. datedA female farm animal which drinks its own milk.

   It is worth while, therefore, to treat the self-suckers while they are giving milk.

   1886, The American Agriculturist, volume 45, page 54

   2 more examples

   It is generally the best cows that are self-suckers, the habit being due to the extreme pressure of milk causing pain.

   1901, The Agricultural Journal of the Cape of Good Hope, volume 18, page 31

   Cows addicted to the habit of sucking themselves should be taken in hand as soon as they are known to be self-suckers.

   1913, The Breeder's Gazette, Farm Buildings, page 310