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Heifer Synch Program

sic 'em reds

Well-known member
What are everyone's thoughts on using GnRH in your synch program on heifers?

My main question is with the CIDR-PG heat detection method, there is no GnRH used. With the Select Synch + CIDR & TAI, you give GnRH when CIDR is put in, PG on day 7 at CIDR removal, heat detect then TAI on day 10 all the nonresponders. So if I breed on standing heat, do I give the second shot of GnRH? I have heard yes and no. With Select Synch, the conception rate is about 55%. I have used both protocols, and can't tell if one is better than the other. With Select Synch I have given GnRH at CIDR insertion, then either given the second shot at standing heat or not given it, and on the particular cows that either got the second or not, I was still at about the 55-60% rate.

Let me kow if you have had experience with this. I have been getting lots of questions lately and I am trying to sort some things out for the customers I deal with.
 

Stretch

Well-known member
sic 'em reds

What are everyone's thoughts on using GnRH in your synch program on heifers?

I am about as far from being an expert on this but I know if you go here

http://www.oznet.ksu.edu/Topic2.asp

and do a search you will find a ton of info on AI stuff. Hope that helps ya... 8)
 

Denny

Well-known member
On our heifers the last 2 years we would put in cydrs give a shot of Lute when we pulled them then give a shot of gnrh when we bred. We would heat check and breed the first day than breed everything else the following morning we've got about 70% conception on them the last 2 years. The cows would get GNRH when we put in CYDRS also_Of the heifers that never showed heat which was 10 head we got 6 calves so even though they dont show heat I would breed them even if it was some cheaper semen.We also reused the cydrs from heifers in the cows never from cow to cow though.

Last year we only had about 40% conception on the cows this year they look like were closer to 70% another week I will know more.Were at 20% right now and they are'nt due until monday.

I think good feed and good Mineral are your number one concern's..
 

sic 'em reds

Well-known member
On the GnRH, I talked with a guy that I really trust, he said on heifers, give the GnRH when you put the Cidr in. If they stand, and you breed on that heat, don't use the GnRH, but if you end up time breeding, give the GnRH.

I still don't know which way is best. It seems the best year we had was when the CIDR's first came out. Put them in, day 6 give Lut., day 7 pull them. Breed on heats.

Half my problem is that I am going to start our heifers next week and starting to second guess, I do it every year.
 
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