MRRherefords":1olg0ga5 said:
So I was going to give a shot of a GnRH vaccine on day 0, then a shot of Lutalyse 7 days after, then heat detect through day 10 when I would give another dose of GnRH and AI. My question is do they have to have just experienced a heat cycle prior to day 0 for this to work.
The 7 day TAI is designed to reset the cows estrus clock. I don't use the 7 day Synch often since I AI on natural heats. The GnRH will rupture the follicle. 7 days later the Prostaglandin will destroy the corpus lutem so she will ovulate. There is no parameter that she just experienced a heat.