Best way to abort pregnancy

[savaged]

I'm wanting to purchase a cow/calf from a friend to use as a recip but she is likely bred for a fall (September) calf.  Is it too late to abort the calf without causing any harm to the cow as a recip this spring?  I'll probably want to put an embryo in her around mid May.

 

[HAB]

If she is 60 days bred, 10 cc of  Lutelyse or Estrumate and Dexmethazone (sp?)  She should abort within 3 days, and be cycling naturally very soon.