At what size/shape/condition of follicle can you give an injection to encourage immediate ovulation? Trying to work with Shipped Semen and possible Monday ovulation(can't get semen Sunday or Monday) If I wanted to get semen shipped on Friday for a Saturday/Sunday breeding what size follicle do we need in order to give her a shot upon insemination??? If that makes sense?
Jos Posted From: 18.104.22.168
Posted on Sunday, May 09, 2004 - 09:02 pm:
You cannot give a shot to produce "immediate" ovulation.
The standard drug in use for stimulation of ovulation is hCG (human chorionic gonadotropin). It is given when there is a follicle 35 mm or greater in average diameter. Ovulation will occur in 36-42 hours in 90% of mares so treated. It is not however immediate.
Another alternative is the use of the deslorelin implant "Ovuplant". This is placed in the labial lip when there is a 30 mm follicle (or larger) present, and ovulation will occur in the next 40 hours in a high percentage of treated animals. It is recommended that the implant be removed 48 hours after it was put in, as there have been incidences of non-return to estrus in mares that do not become pregnant following the use of Ovuplant.
Once an also use native GnRH, but it is quite expensive. 2 doses a day, 2 days in a row, once a 35 mm follicle is present. Time frame is approximately the same as for either of the above.
With all of these drugs, you will get a more reliable response if there is uterine edema present during the estrus cycle they are given. The presence of systemic steroids (specifically estrogens) - which leads to the edema - indicates that the mare has passed through transitional phase and the cycle is likely to be a breedable one.
Anonymous Posted From: 22.214.171.124
Posted on Tuesday, May 11, 2004 - 09:13 pm:
In general...how long does healthy semen(cooled and shipped) survive once it is inseminated into the mare? If I have a mare who will most likely be ready to breed on Monday(Can't get semen that day). Could I inseminate with shipped semen on Saturday and "Hope" to have success? HCG or No HCG? (As long as there is good uterine edema.)
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