Lutalyse question

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DB

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I was wondering how long after you think a cow or heifer might have had a heat could you give lut to bring back into heat? I am not sure if she was in heat for sure but acted like it but am not quite sure how low to wait before I should hit her with lut. Is there a certain number of days to wait or will it work right away? thanks for any information.
 

Bradenh

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In a hypothetical 2 shot scenario you'd give a shot... see heat 72 hours later and 11 days after the first shot you'd give a second shot and have another heat 72 hours later so your heats would be 14 days apart but your distance from "heat to second shot" would be 8 days

If you had a natural heat I would say you would be best off waiting 8 days to try again.

Basing that off of a 2 shot protocol ... but you only give one shot since your first heat was natural

Someone please correct me if I'm wrong which I'm sure I probably miscalculated in there

Natural heat.... wait 8 days to give shot
2 shot protocol you'd have a shot... 3 days later have a heat... 11 days after the first shot give another shot and have heat 3 days after that

So you would go ~8 days after heat to give the next shot
 

GrowerShower32

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Ok I have a question concerning lutalyse and a cow that has calved(postpartum anestrus) ok I have a cow that is coming up on 50 days post calving I haven't seen any signs of estrus but I can't say she didn't have a silent heat but I can say I have noticed any signs of heat. If she is 50 days post calving if I give her a shot of lutalyse could I have a heat? Cause she bred back her last two times within 30 to 40 days post calving cause she has a bull calf on the ground to speak for that.

So would I be pouring water on a duck's back if I give her the shot on day 50 without any signs of heat before?
 

Bradenh

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It won't bring one out of anestrous they need to be cycling back in order for it to work, using a protocol with a cidr could jump her into estrus a little quicker but the estrumate or lut in theory shouldn't do you any good since you haven't observed heat on her to confirm she's cycling
 

WinterSpringsFarm

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Read the label, it'll tell you how many days post heat to give her a shot to bring her back in. Works like a charm on most cattle.
 

SimFarmer

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Oct 18, 2014
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My beef repro professor in college always said it was ineffective until 5 days after heat.
 

firesweepranch

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GrowerShower32 said:
Ok I have a question concerning lutalyse and a cow that has calved(postpartum anestrus) ok I have a cow that is coming up on 50 days post calving I haven't seen any signs of estrus but I can't say she didn't have a silent heat but I can say I have noticed any signs of heat. If she is 50 days post calving if I give her a shot of lutalyse could I have a heat? Cause she bred back her last two times within 30 to 40 days post calving cause she has a bull calf on the ground to speak for that.

So would I be pouring water on a duck's back if I give her the shot on day 50 without any signs of heat before?

IF she has not cycled, the lute will do nothing. In that case, I would put a CiDR in her for 7 days, then pull and give lute. There was a recent article put out about shortening up your calving window by using the CiDR/Lute cycle 21 days after calving to get the last ones cycling quicker. (http://www.beefmagazine.com/breeding/4-tips-using-cidrs-move-late-calvers)
I have a two year old nursing her fist calf, and she is 60 days post calving and has not cycled. I plan on putting a CiDR in her this week to get her going. It works most of the time.

IF she has cycled, you need to wait 8 days AFTER her observed heat to try a shot (like others said here).
 
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