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Short Cycling

Equine-Reproduction.com Bulletin Board » Breeding Problem Mares - Volume 1 » Short Cycling « Previous Next »

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Sammie (12.145.186.66)
Posted on Tuesday, July 02, 2002 - 01:04 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I have a mare with a .45 folical today. I had them collect the stallion who is usually great, and they only got 10cc out of him, and have another shipment. I have two questions.

THe owner doesn't think it is a good idea to collect him agian. I know when I breed I get more and better semen the more I breed it seems like if we are breeding he produces more.. She seems to think that it is he just is back to his undersaddle work and may be a little stressed.. One do you think it is a good idea to try to collect a few hours apart.

Two. If I short cycle my mare I have to wait 6 days post cyle and then 5 days post shot correct... the year is flying by and I am getting later and later.

We can't ship tomorrow it is the fourth..

figures.

Murphy has been hanging around my place this month.
 

Jos (142.177.113.7)
Posted on Tuesday, July 02, 2002 - 11:49 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Without performing a proper sperm count (which it sounds as though the stallion owner is not doing) it is impossible to determine if there will be enough sperm to ship two doses. Volume means nothing!! If the sperm count is high, there does not need to be a high volume of ejaculate; if the sperm count is depressed there may well be considerably fewer sperm in 100 ml of semen than there are in 10 ml!!

As a general rule, a stallion will produce approximately one-half the number of sperm in the initial ejaculate if they are collected again one hour after the first collection - and usually with better progressive motility (as the dead sperm reserve has been depleted with the first ejaculate). It is unlikely therefore that there would have been a problem doing a second collection unless this stallion has been in heavy breeding use (i.e. collected every day for a week) - but again, without a sperm count it is impossible to say for sure.

The timing of breeding when using prostaglandin is not reliable, although your estimate is a good approximation. In the height of the physiological breeding season (where we are now) estrus tends to be shorter, so you will tend to see an ovulation earlier than you would in say April. The interval from dosage to estrus is usually 3-5 days (there can be variations in that though - see the article here for more information about its use). Ovulation will be likely to occur 3-5 days after onset of estrus.
 

Debi (152.163.205.63)
Posted on Wednesday, July 03, 2002 - 07:48 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Sammy,

Our stallion has been used quite frequently this season and his volume is usually around 25cc's. However, his sperm count is around 700 million per cc. We only ship about 4cc's of semen split for two doses, then we add extender as his motility is very high. Sperm count and motility is everything when you are shipping semen. Good luck and don't worry about the late season, we still have around four outside mares to breed yet this year.
 

Sammie (12.145.186.66)
Posted on Wednesday, July 03, 2002 - 11:12 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Thanks for your help.. I am not sure of the whole situation. This is a reputable stallion, and the owner is out of town, very knowledgable too, but traveling you have little control of the situation. Yes I know Motility is everything. My stallion last month wasn't bred in like two weeks and only sent like 15 ccs that we split for two mares. but his motility and sperm count was high we checked it before sent and both mares were in foal. I think she may have an another mare waiting and didn't want to thin it out.. I have been breeding for 3 years and this year standing my own stallion bred to 8 mares.. I have learned a whole lot. My vet helped me palpate my mare yesterday which was another great learning experience.. THanks for all your help. and JOS I LOVE reading all your information.. You are Wonderful. Either you are a VET or a VERY EXPERIENCED Breeding Facility.



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