On Tuesday 3 big strong homebred store heifers started puffing nothing bad,but called vet out .He said it didn’t look too bad and injected with alamycin and metacram,No foaming Just puffing as if they had run round the pen.Spoke to vet yesterday told to draixin and met .No change just puffing now dead.This did not look like normal pneumonia if that’s what it was.Had a calf with a similar puffing ,she responded up to now.Not seen this before.