The semantic change from Lat. vervex 'wether' to berbex 'sheep' may be explained either by the influence of animal names such as Lat. perdix 'partridge', or by the influence of Lat. nutrix 'wet nurse' (TLF).
Michiel de Vaan. Etymological Dictionary of Latin and the other Italic Languages. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Trésors de la langue francaise informatisées. Centre national de ressources techniques et lexiques. http://www.cnrtl.fr/definition/
DEX online (2004-2015). Dicționare ale limbii române. https://dexonline.ro/
Robert Farren, PIE culture words collection, 2017
CW87, CW93, CW97, TL93
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