Ai, or artificial insemination, is the process of introducing sperm into the reproductive tract of a mare in order to fertilize her eggs. It is a commonly used technique in both the horse breeding and dairy industries.
When selecting a sperm donor for ai, one of the most important factors to consider is follicle size. The size of a mare’s follicles will dictate how many sperm she is able to absorb and, ultimately, how successful the ai will be.
smaller follicles (<8mm) - often require higher doses of sperm and have a lower success rate medium follicles (8-12mm) - are the ideal size and have the highest success rate large follicles (>12mm) – while they have a higher success rate, they also have a higher risk of twins or triplets
There is no definitive answer to this question as it will depend on the individual mare and her specific breeding goals. However,if the mare is being bred for sport or racing, it is generally recommended that she have a follicle size of at least 35mm in order to produce a high-quality embryo.
How big should a follicle be for insemination?
The optimal follicular diameter associated with increased pregnancy rates in gonadotropin-stimulated IUI cycles was between 19 and 20 mm. This is according to a study that was conducted in order to determine the ideal follicular size in IUI cycles. The study looked at a total of 814 cycles, and found that the pregnancy rate was highest when the follicular size was between 19 and 20 mm. This is the first study to specifically look at the relationship between follicular size and pregnancy rates in IUI cycles, and provides valuable information for those who are undergoing this treatment.
Chilled semen is the best option for artificial insemination (AI) in horses. The optimal time for AI using chilled semen is within 24 hours before expected ovulation. The insemination should be repeated after 48 hours if the mare has not ovulated.
When frozen semen is used, every attempt should be made to inseminate the mare within 12 hours before ovulation or within 6 hours after ovulation.
What size should a follicle be to ovulate
The ideal size for a follicle in a fertility cycle is between 18 and 22 millimeters in diameter. Once a follicle reaches this size, it means that estrogen levels are rising and the uterine lining has thickened. This is the ideal time for conception to occur.
The goal of an IVF cycle is to have 2-3 follicles reach 18mm in diameter. Once the follicles are the right size and the lining is thick enough (>7mm), the patient is instructed to take the “trigger” medication. The “trigger shot” prompts the mature eggs to be released in 36-40 hours.
What size follicle is too big to trigger?
The trigger should be given when the follicle is between 18-23 mms. Once larger than that, the egg becomes over mature and non-viable.
A follicle is a saclike structure in which an egg develops. The size of a follicle can vary, but usually, once it is greater than 24 mm, the egg within is overmature and no longer viable. This is because the follicle has not been able to release the egg in time for fertilization. There are many factors that can contribute to this, including hormonal imbalance, stress, and age. If you are concerned that you may not be releasing eggs that are viable, it is important to speak to a doctor or fertility specialist.
At what size follicle will most mares ovulate?
Follicle size is an important factor in determining whether or not a mare will ovulate. Mares typically grow follicles to a size between 40 and 50 mm before they ovulate. Some mares may ovulate smaller follicles, and others (particularly draft breeds) will typically grow much larger follicles (50-60 mm) before ovulation.
The success rate when using AI is quite high, averaging at 60-90%. This means that it usually does not take more than a couple of cycles to get your mare in foal.
What is the success rate of horse AI
There is a big difference in cooled pregnancy rates and frozen semen rates. Cooled pregnancy rates average 70% while frozen semen rates might average 40%. This might depend on the timing of the foal’s birth the following year. For racehorses, there is often a strong incentive to have an early foal.
Ovulation induction is a process by which medication is used to stimulate the ovaries to release eggs. This includes monitoring the number and size of the follicles on each ovary. When your follicles have reached around 18-20mm in diameter they are deemed ready for egg collection.
Does follicle grow after trigger shot?
Instigating the trigger shot during IVF must be done with care, as it is essential to properly timed. This is due to most of the ovarian follicles being greater than 15 mm in diameter, with several follicles having reached 18 to 22 mm, meaning that they have grown an average of 2 mm per day during the later stages of stimulation. If the trigger shot is not done correctly, it can lead to an incomplete or failed IVF cycle.
A follicle is a small sac in the ovary that contains an immature egg. The size of a follicle can tell a fertility specialist how much an egg has developed during a woman’s cycle. The bigger the follicle, the better it is for the IVF process. For most IVF treatments, a follicle that is around 15mm-22mm (micrometers) large is most likely to produce a viable egg.
Can a 16mm follicle have a mature egg for IUI
It’s important to remember that with an intra uterine insemination (IUI), the chances of getting three mature eggs is relatively low. All follicles that are less than 16mm will be immature and will not respond to HCG (Ovidrel). However, if the follicle reaches 18-20mm, there is a chance that it will ovulate despite HCG.
There is some evidence that different protocols can impact the size of follicles. In one study, it was found that higher pregnancy rates were achieved when the lead follicles were in the 23 to 28 mm range. This suggests that if you are trying to conceive, it may be beneficial to choose a protocol that produces larger follicles.
Is 22 mm follicle too big?
The dominant follicle is the only marker that can predict ovulation with ease. The average diameter of the dominant follicle is 22 to 24 mm (range 18-36 mm).
The study found that hCG administration at a lead follicle size of 211-220 mm is associated with higher odds of clinical pregnancy in patients undergoing their first CC-IUI cycles for ovulatory dysfunction or unexplained infertility. This may be due to the fact that hCG administration leads to an increase in follicular size and thus, a better chance of ovulation.
What is the ideal egg size for trigger
When trigger shots are given too early, before the follicles have reached an ideal size, it can result in a lower egg yield and fewer mature eggs. This is why it’s so important to work with a fertility specialist who can monitor your follicle growth and help you time your trigger shot perfectly.
It is clear from the secondary follicles in the multiple pregnancies that follicles of diameter 16 mm and 15 mm are capable of contributing to the implantation. Follicles with FD=14 mm also appear capable of yielding an implantation. However, the number of implantations achieved was lower for the 14 mm follicles than for the 16 and 15 mm follicles.
What size follicles for twins
These results suggest that the number and size of follicles are important factors in the likelihood of achieving a twin or multifetal pregnancy. Follicles 12 mm or wider are associated with a greater chance of achieving a twin or multifetal pregnancy.
Day 11 – Follicle still 15mm, 1 additional small follicle seen. This is encouraging news and means that the ovulation induction medication is working. Keep up the good work!
Can a 10mm follicle have a mature egg
Based on our observations, we can conclude that immature oocytes can be retrieved from large follicles, and mature oocytes can be collected from small follicles. However, fertilization rates differed, but once formed, embryo quality did not vary across the spectrum of follicle sizes.
The data in Table 2 shows that there is a wide range in follicle growth rates among individual mares, both for the first ovulation and subsequent ovulations. There is also a wide range in growth rates between Day -8 and Day 0. This suggests that there is considerable variation in the way that individual mares respond to the ovulation-inducing hormone.
What should be the size of follicle on day 12
It is important to track the growth of the follicle in order to ensure that the egg is released at the correct time. A follicle size of 14 mm on day 12 is just ok for day12, but the endometrial thickness is not very good. If the follicle matures to 20mm, the chances of egg release are more.
Overall, it is more likely that follicles of 16-22 mm on the day of oocyte retrieval will contain mature oocytes than smaller follicles. However, larger follicles are more likely to contain post-mature oocytes. This is due to the increased risk of follicle atresia (2) with larger follicles.
What are 5 cons for AI in horses
Mare owners have a few options when it comes to breeding their mares: artificial insemination (AI), live cover, or hand breeding. While each option has its own set of pros and cons, AI is becoming increasingly popular due to its high success rate and low cost.
One advantage of AI is that it allows mare owners to breed their mares to stallions that they might not otherwise have access to. This can be especially beneficial if the mare owner is looking to breed to a stallion with superior genetics. Additionally, because AI involves collecting and freezing the stallion’s semen, there is no need for the mare and stallion to be present in the same place at the same time. This can be a major advantage for those who do not live near the stallion of their choice or who do not have the facilities to house a stallion.
There are a few disadvantages of AI to be aware of as well. One is that mares often need to be in heat in order for the AI to be successful, so mare owners may need to use a phantom mare or another method to induce their mare’s heat cycle. Additionally, because AI involves the use of frozen semen, it is possible for the semen
In the dairy industry, conception rates were two percent higher with AI than natural breeding. With AI, the semen is put right up into the body of the uterus and if heat detection is accurate, higher conception rates should be the result.
Which breed of horse does not allow for artificial insemination
Thoroughbred horses are known for their athleticism and are used in a variety of racing disciplines. They are tightly controlled in terms of production, with artificial insemination not permitted. This means that breeding stallions must be moved around frequently to meet up with females for mating. These so-called shuttle stallions can mate with hundreds of mares per season.
Artificial insemination success rates vary depending on the age of the woman. For women under 35, the success rate is 158%. For women aged 35 to 39, the success rate is 11%. For women aged 40 to 42, the success rate is 47%. These success rates are per individual cycle.
There is no definitive answer for this question; it will depend on the individual mare and what her specific breeding goals are. However, generally speaking, a mare should have a follicle size of at least 35 mm in order to be artificially inseminated.
Mares typically ovulate follicles between 30 and 40 mm in size. Larger follicles (>40 mm) may be associated with poorer pregnancy rates, while smaller follicles (<30 mm) may not ovulate.