Same here. I am looking for something new to use in synching my heifers and cows this spring. We have been doing timed AI, but have not had the results that I would like. If this looks promising, may use this in addition to the heat watch system so I do not miss many cows in heat since I have a job in town.
The 5 day protocol requires (2) shots of prostaglandin 8 hours apart. I don't synch that many cows but it sounds like a lot more effort (and another pass through the chute). Unless the results are a lot better than the seven day protocol it won't be worth it.
There are quite a few things in that protocol that do not fit with bovine endocrinology. 1) Without keeping the CIDR in for 7 days, you are not giving all of the cows a chance to form a CL. 2) The 2 shots of PGF2a within 8 hrs is redundant and the second shot should have no affect. 3) If a particular cow was receptive to this protocol, I would still expect her to be in heat within 48 hrs of pulling the CIDR, which means that if you breed at 72 hrs, you missed her.
It was reported to me from my area manager after he returned from the Denver Stock Show. I don't know much more than what I have said here but he seems to think "the implications are huge!" It will be included in the Spring Sire Summary from ABS so I would expect to see more information an applications for this protocol soon.
After trying a timed AI on my cows for two years, I said the heck with that. I still synchronized last year but only AI'd on observed heats. From the preg check and the looks of things, I did much better that way. Will no more shortly, cows are due Feb 12.
Alot of guys in our area are doing a bit of heat detecting after CIDR removal-then after a certain amount of time mass breeding the remainder that haven't showed standing heats. Estrus alerts have really made heat detecting alot less cumbersome. Myself after mass breeeding customers cattle all summer-I retire to the deck of a good saddle horse and ride and pull 'hots' with my kids. Kind of a nice way to spend a couple weeks or so till school starts.