I have 100 angus and angus cross bred heifers for sale. 2 groups of Aid in 14 day calving windows. Also 3 groups of bull breds. 
Ais start calving March 1st and Bull breds start March 15th. We have calved out the AI and bull bred sires for the last couple of years. Little to no help in calving them. They have been around horses, dogs, atvs and utvs. Nice gentle set of heifers. Will come to bale pickup or cubes. 
Have been repregd recently after being ultrasound pregged in September to determine calving dates. They have been given scourgard and poured.