Before I even start this blog, I want to say that my approach is “less is more” when it comes to using hormones to A.I. cows or heifers. That being said, life is not perfect, and we can not set aside our entire life for 30-60 days to get all of our cattle A.I.ed at the perfect time. There are many different regimens that I use to synchronize groups of cattle, but they all include at least 2 of the following drugs: Lutalyse, Cystorellin, and CIDRs. I will highlight my 3 favorite regimens.
When I want to keep the cattle fairly close together, but I have some time to heat check and A.I. for several days, I use this:
The total number of days is 11. 1/4 of the cattle only go through the chute 1 time, and the other ¾ of the cattle go through the chute 2 times and only get 1 shot of Lutalyse.
In times when I have more time immediately, and my working facilities are better, I use this schedule:
Total number of days is 12. ¾ of the cattle go through the chute 2 times and only receive 1 shot of Lutalyse, and the other ¼ are run through the chute 3 times and receive 2 shots of Lutalyse.
This regimen is different than the typical 2 shot method because ¾ of the cattle only get one shot of Lutalyse, and more of the cattle are run through the chute less times.
The last method is used when a mass A.I. is planned, or a minimal number of days are available to A.I. cattle. I prefer heat checking and A.I.ing animals observed in standing heat, but sometimes it just isn't feasible.
At this point, cattle can either:
When A.I.ing cattle, either after a natural heat or synchronized heat, I like to administer 2cc of Cystorelin at time of insemination.
Another money saving tip I just learned about is cutting the heat detection patches in half longwise, thus doubling the number of patches for the same money.
Disclaimer: Any of your prostaglandin drugs such as Lutalyse and your GnRH drugs like Cystorelin, must be prescribed by a licensed veterinarian, administered according to their label. Any extra-label use of these drugs must first be discussed and approved by a licensed veterinarian.