ABSTRACT
The mammary system has two distinct glands, supported by the median suspensory ligament, each with its own teat, nerve and blood supplies and lymphatic drainage. The supramammary lymph nodes are only detected by deep palpation and their enlargement is often masked by oedema and swelling of the infected gland. Except for the rst few weeks of lactation, it may prove difcult to express more than a few millilitres of milk from the normal glands because of frequent sucking by the lambs.
