1) Ventilation 
• (p. pr. & vb. n.) of Freshen
Preparation of an open, partially healed wound for secondary closure by removal of fibrin, granulations, and early scar tissue. ... (05 Mar 2000) ... 
when a dairy cow gives birth.
Type: Term Pronunciation: fresh′ĕn-ing Definitions: 1. Preparation of an open, partially healed wound for secondary closure by removal of fibrin, granulations, and early scar tissue. 2. In cattle, the act of the cow coming into her milk production cycle.
Parturition, calving.