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First timer question

NolanCountyAG

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Had a few start standing at 11:00am this morning. Now, would I breed them at 11:00pm? Or is it 12 hrs after they have stopped standing? Any help is appreciated.
 

Margonme

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NolanCountyAG":1pwlel35 said:
Had a few start standing at 11:00am this morning. Now, would I breed them at 11:00pm? Or is it 12 hrs after they have stopped standing? Any help is appreciated.

On-set of standing estrus at 11 am. I would breed her at about 7 pm give or take an hour. The window is open from 4 to 12 hours after the on-set of standing heat. At about 8 hours you are right in the middle of the window. The spermatozoa have an estimated 24 hour viability span. That should cover her at ovulation.
 

NolanCountyAG

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Margonme":2c8l964g said:
NolanCountyAG":2c8l964g said:
Had a few start standing at 11:00am this morning. Now, would I breed them at 11:00pm? Or is it 12 hrs after they have stopped standing? Any help is appreciated.

On-set of standing estrus at 11 am. I would breed her at about 7 pm give or take an hour. The window is open from 4 to 12 hours after the on-set of standing heat. At about 8 hours you are right in the middle of the window. The spermatozoa have an estimated 24 hour viability span. That should cover her at ovulation.

Thank You
 

Till-Hill

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Son of Butch":2bnk0vii said:
I'd breed them now. I prefer early to late and good quality semen is viable longer than most believe.
Yep, I used to bust my tail to try and get as close to 12 hours as possible. Now I try and wait a few hours but if I'm breeding another and see someone stand I breed them while I'm in the groove
 

dun

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Late this evening will be fine. If you happen to notice her still standing tomorrow morning (I've seen some long estrus cows) I would hit her about noon tomorrow.
 

NolanCountyAG

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Thank you. I hit a few around 3 and have these still in the pens to do later. I think I'm over thinking this more than I should.
 

Margonme

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NolanCountyAG":3jhwwrl9 said:
Thank you. I hit a few around 3 and have these still in the pens to do later. I think I'm over thinking this more than I should.


I agree with dun.

Regarding over thinking. Lol. Join the club.

:banana:
 

Putangitangi

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Margonme":33anhxms said:
...The window is open from 4 to 12 hours after the on-set of standing heat. At about 8 hours you are right in the middle of the window. The spermatozoa have an estimated 24 hour viability span. That should cover her at ovulation.
Where does that timing recommendation originate? I thought it was 10-18 hours after the beginning of standing??? Is that why my conception rate is only running at 80% this year?
 

Margonme

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Putangitangi":384i5il0 said:
Margonme":384i5il0 said:
...The window is open from 4 to 12 hours after the on-set of standing heat. At about 8 hours you are right in the middle of the window. The spermatozoa have an estimated 24 hour viability span. That should cover her at ovulation.
Where does that timing recommendation originate? I thought it was 10-18 hours after the beginning of standing??? Is that why my conception rate is only running at 80% this year?

Dr. Ray Nobel, Vice President of Technical Services Programs and Earl Ingram, Reproduction and Dairy Management Training Specialist; Select Sires AI Training Manual.

Their window is 4 to 16 hours following "the Onset of Standing Estrus". They list the span of viable sperm from 24 to 34 hours. Their chart depicts ovulation as occurring 28 + or - 4 hours after the Onset of Standing Estrus. Thus 8 hours from the Onset of Standing estrus is approximately in the middle of the window. To be more accurate, 10 hours is exactly in the middle of the window.

In practice, I try to hit the middle of the window but I sometimes change that based on circumstances of convenience.
 

True Grit Farms

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In practice, I try to hit the middle of the window but I sometimes change that based on circumstances of convenience.[/quote]

Do see any difference in conception rates when you vary your timing? You seem like a stickler record keeper. Thanks
 

Margonme

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TG stated:
Do you see any difference in conception rates when you vary your timing? You seem like a stickler record keeper. Thanks

I keep detailed records on each service, including:
1. Notes on cow behavior and when she first stood.
2. Time of service and what bull was used.
3. Observations on the cervix. Was it firm, did it have good tone, or was it soft?
4. Whether cystorelin was used.

I often vary the time of service, but I stay inside the Select Sires 4 to 16 hour window. If I go short window or long window, I do not see any difference in conception.
 

Margonme

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SIMMGAL":3qjkzk3u said:
GnRH at breeding generally helps with the ovulation timing! Helps close the window a bit.

Not everyone agrees with its use. Some very learned veterinarians say it is not harmful but not helpful. I use it if I am noticing erratic estrus cycles to treat cystic ovary.
 

SIMMGAL

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Margonme":36h4zy92 said:
SIMMGAL":36h4zy92 said:
GnRH at breeding generally helps with the ovulation timing! Helps close the window a bit.

Not everyone agrees with its use. Some very learned veterinarians say it is not harmful but not helpful. I use it if I am noticing erratic estrus cycles to treat cystic ovary.

I noticed an increase in conception once I started using it at breeding a few years ago. Could have been any number of factors, but that was the only variable I had changed at the time. Also been using it in synch protocols and flushes for years. Most everyone around here swears by it! Hey, to each his/her own! :banana:
 

Margonme

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SIMMGAL":yh163lus said:
Margonme":yh163lus said:
SIMMGAL":yh163lus said:
GnRH at breeding generally helps with the ovulation timing! Helps close the window a bit.

Not everyone agrees with its use. Some very learned veterinarians say it is not harmful but not helpful. I use it if I am noticing erratic estrus cycles to treat cystic ovary.

I noticed an increase in conception once I started using it at breeding a few years ago. Could have been any number of factors, but that was the only variable I had changed at the time. Also been using it in synch protocols and flushes for years. Most everyone around here swears by it! Hey, to each his/her own! :banana:

My reference was limited to the use of GnRH in AI protocol. Obviously, it is essential to use in synchronizing and flushing protocols.

I rarely use it. In fact, I use it so infrequently, that I have prepared a syringe with cystorelin and had it ready to administer after breeding, all in vain because I released the cow before I remembered I was going to use it. A cow with a normal functioning endocrine system should not need a synthetic GnRH hormone to release a viable ovum. Nevertheless, if it makes you feel better, it does no harm. I am kinda superstitious myself, I always wear the same coat with the left sleeve removed when I AI.
 

Putangitangi

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Margonme":2jimws9w said:
...I often vary the time of service, but I stay inside the Select Sires 4 to 16 hour window. If I go short window or long window, I do not see any difference in conception.
What's your conception rate, if that's not an indelicate question?
 

Margonme

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Putangitangi":3t33mm5h said:
Margonme":3t33mm5h said:
...I often vary the time of service, but I stay inside the Select Sires 4 to 16 hour window. If I go short window or long window, I do not see any difference in conception.
What's your conception rate, if that's not an indelicate question?

On my farm, me doing the heat detection - at a minimum 80%. There are factors beyond my control but I expect every cow to stick. Last year I was 100% on first service. Recognize that my population size is relatively small. This breeding season I had a couple that got second service but I ended with 80 % conception.

I run a small herd of registered cows. I am 100 % AI. No bull.
 

Putangitangi

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Margonme":3vdqovzd said:
On my farm, me doing the heat detection - at a minimum 80%. There are factors beyond my control but I expect every cow to stick. Last year I was 100% on first service. Recognize that my population size is relatively small. This breeding season I had a couple that got second service but I ended with 80 % conception.

I run a small herd of registered cows. I am 100 % AI. No bull.
To my horror I've just calculated my running conception rate at 72%. It'll climb back up to 78 if the last two hold to their first. Timing has been tricky at some times in the heat - they don't always show a lot of oestrus behaviour. Looks like I might have to shorten my target window. I got the 10-18 from a document/research someone else had posted in here a few years ago.
 
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