Conventional wisdom is that it takes around 45 days to commence cycling again. Heifers because of the stress of milking take a little longer. This year we have had them start cycling in less then thirty days, one heifer it was only 15 days. Frequently the first heat after calving will be sub-fertile, but don't bet on it. If the aren't cycling by 60 days and your feed and mineral program has them in BCS of at least 5 (we prefer a minimum of 6), there are hormones you can inject that will "usually" start them cycling. GNRh followed by PGF2 a week later will normally get the ball rolling.
> I would like to know how long
> after calving does it take the cow
> to start cycle again. I would also
> like to know if you can speed that
> time up and does it take longer
> for heifers.