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Breeding natural cycle vs short cycle

Discuss all kinds of problems encountered in breeding mares from not standing for live cover, through to not getting pregnant for unknown reasons!

Moderator: Jos

Breeding natural cycle vs short cycle

Postby katehanson » Fri May 23, 2014 3:00 pm

We are doing our own deep horn insemination with our mares using frozen semen from our daughters stallion. We are not pros by any means, although I have taken a very short course in deep horn insemination and study for hours on equine reproduction. We don't short cycle any of our mares and have had great success in getting mares pregnant on the first try (even using as little as one straw). The semen is excellent quality and have even checked it after sitting on a slide for 12 hrs in the trash and still had movement.
My daughter has sold breeding's to her stallion using frozen semen. In the contract it states that the mares must be inseminated by a vet. The vets all seem to want to short cycle the mares and are not having luck getting the mares in foal.
I understand that breeding is all a timing thing and if you are short cycling mares you better be watching what's going on. But I am wondering if the percentage rate of pregnancies drops any with the use of short cycling? Is there any other affects on the follicle possibly that when forced back into heat isn't quite developing right? Or Is it just insemination timing not right? I know they are hormones, but the mare produces these on her own and it seems like more isn't always the answer and the few days gained isn't worth loosing a breeding cycle.
I've been breeding Clydesdales for over 30 yrs and it just seems that the success rate really seems to drop on mares that are short cycled. I've also noticed that many vets don't seem to know that the draft horses (especially Clydesdales) are more susceptible to drugs and wonder if the dosage could be the problem.
Any suggestions?
Thanks,
Kate
katehanson
Nursing Foal
 
Posts: 11
Joined: Tue Jul 10, 2012 11:20 pm

Re: Breeding natural cycle vs short cycle

Postby Jos » Sun May 25, 2014 7:02 pm

For the most part there is no reduction in fertility associated with the use of PGF2α - in fact there is even some evidence that it may enhance fertility by the promotion of double ovulations (Ginther OJ, Al-Mamun Md. (2009) Increased Frequency of Double Ovulations after Induction of Luteolysis with Exogenous Prostaglandin F2α. J. Eq. Vet. Sci. 29;7: 581-583 ).

In a minority of cases, there may be a reduction in fertility. We have some discussion on possible factors related to this in our article about why prostaglandin may not work. This in particular is related to the minority of instances where there is a rapid onset of estrus after PGF2α is given owing to there being a large follicle present. That has been shown to result in a 50% reduction in pregnancy rates compared with mares that return to estrus in a "normal" manner (3-5 days) after receiving PGF2α. It should also be noted that a small number of mares may be more likely to develop AHFs following PGF2α treatment, but in both of those instances, the numbers are very much a minority and are also clearly identifiable.
We're always happy to try and help, but don't forget to check the articles section
of the website too, which has a search engine to help you look for answers!
:)
User avatar
Jos
Senior Stallion or Mare
 
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Re: Breeding natural cycle vs short cycle

Postby katehanson » Tue May 27, 2014 10:26 am

Thanks Jos. I have a feeling it's vet error/timing as we haven't had any trouble getting our mares pregnant with his semen and it's the same batch of straws. I could see one, maybe two, but not all three mares having a reaction and not getting pregnant...except if they aren't monitoring the mares and catching them right.
Thanks again.
katehanson
Nursing Foal
 
Posts: 11
Joined: Tue Jul 10, 2012 11:20 pm


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