From The Collaborative International Dictionary of English v.0.48:
Yean \Yean\, v. t. & i. [imp. & p. p. Yeaned; p. pr. & vb. n.
Yeaning.] [AS. e['a]nian, or gee['a]nian; perhaps akin to
E. ewe, or perhaps to L. agnus, Gr. ?. Cf. Ean.]
To bring forth young, as a goat or a sheep; to ean. --Shak.