After reading all of the ai topics its got me thinking. Im wanting to try to gain a little time on my calving cycle and wanting to ai. I have a few questions, I am wanting to do the lute shot, then wait and give a seco lute shot tehnique. My question is the cows that I am wanting to breed will be around 40 days sine they have calved when I am considerering the sync. Is this too soon? any suggestions are welcome.
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- Thread starter cleland
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My preference for mmoving cows up, or for just jump starting their cycling is GNRh followed in 7 days with PGF2 (lute) then heat detect and breed over the next couple of days. It's about as close to naural as you can get when using shots. It doesn;t have the cache of some of the newer protocols, but it works.
dun
dun
I used the two shot PGF2 protocol this last season and didn't get the desired effect (I wanted to breed everything in one week) One silent heat and one that wasn't cycling yet really messed my plans up.
Go with Dun's suggestion, if you want to move them forward, if not heat detect and breed for 7 days, Lute the rest, heat detect and breed. That works very well IF they are all cycling.
Go with Dun's suggestion, if you want to move them forward, if not heat detect and breed for 7 days, Lute the rest, heat detect and breed. That works very well IF they are all cycling.
KNERSIE":2w187usb said:
That's the advantage in theory of the GBRh then the PGF2. If they're cycling it will put all of them on the same sheet of music by starting a new follical wave. The main time we've used it in the past is for a cow that hasn't started cycling yet after calving.
Besides, it's about the cheapest system in dollars.
dun
This from the Select Sires reproduction manual:
The protocol we use is called Select Synch
"Fact: First of all, only cows with a functional C.L. will respond to PGF. Non cycling animals and animals that were in heat within 5-6 days prior to the injection are not going to respond. Secondly, even for cows that do have a palpatable C.L., a certain percentage are not functional and thus do not respond even after the vet says to give them a shot.
Thirdly, for those animals that do respond to PGF, estrous activity may be at 36-+8 hours or may not start until 100 hours or more after the injection. Thus, on average, many of the animals will be ready for insemination at 80 hours. But an equal or greater number will be either too early or too late for optimum conception at that time. "
The protocol we use is called Select Synch
"Fact: First of all, only cows with a functional C.L. will respond to PGF. Non cycling animals and animals that were in heat within 5-6 days prior to the injection are not going to respond. Secondly, even for cows that do have a palpatable C.L., a certain percentage are not functional and thus do not respond even after the vet says to give them a shot.
Thirdly, for those animals that do respond to PGF, estrous activity may be at 36-+8 hours or may not start until 100 hours or more after the injection. Thus, on average, many of the animals will be ready for insemination at 80 hours. But an equal or greater number will be either too early or too late for optimum conception at that time. "
Information on what GnRH is and what it does:
http://www.iowabeefcenter.org/Publicati ... ittier.pdf
dun
http://www.iowabeefcenter.org/Publicati ... ittier.pdf
dun
