Slow growth of folicals - The Horse Forum
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post #1 of 4 Old 11-22-2014, 12:28 AM Thread Starter
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Smile Slow growth of folicals

Hi everyone,
Just new at this today but here is my question.
I have been around horses for over 16 years and have never progressed into the breeding side of things - mainly ridden work.
I have 2 Friesian maiden mares and we are ready to start breeding with them.However , their folicals are taking so slow to grow?Is this the norm? I was told the hotter the weather the better for growth - is this an old wives tale or not?
We are in Spring here in Australia and in one of the hottest states but they only seem to be growing 5mm per day, sometimes that growth over 2 days.
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post #2 of 4 Old 11-22-2014, 03:13 AM
Green Broke
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Welcome to the forum

Probably not started into normal cycles yet. Mares will go through a transitional heat before they are fertile in their cycles. If their hormones are a bit off, they may continue to take longer than average before they are cycling correctly. When they finally do ovulate the first time, skip that cycle and try for the next. You will have better success. If your vet is an experienced equine reproduction specialist, trust their judgement and expertise.
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post #3 of 4 Old 11-22-2014, 07:36 AM
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Several things help bring about fertile breeding cycles and then there are other things that are just indicators of breeding readiness.

First, are they showing strong heat now?

What sizes are their actual follicles?

How long have they been showing heat?

Are they being teased vigorously by a stallion? Teasing stimulates heat cycles and is necessary in many mares. We have found that daily 'aggressive' teasing makes a HUGE difference in some mares.

Are they eating good, green grass? Adequate intake of Vitamin A is VERY necessary to have fertile heats. Supplementing Vitamin A is very beneficial, even for mares on grass. We use the injectable form only give it to them orally. A good supplement that is available world -wide is Farnam's 'Mare Plus' (so named because of its high Vitamin A levels). It takes 30 to 60 days to actually show an improvement which is why we use the oral doses of the injectable Vitamin A-D.

Are they in good flesh? Not too thin and not too fat?

Are they 'slick' and completely shed off? You have longer heat cycles before a mare is completely shed off or at least shed slick on the neck and shoulders? This is a very good indicator of readiness to have a fertile heat.

Transitional heats are usually earlier in the season than where you are now in your summer. You are only 1 month from your summer solstice. you should be seeing shorter heats by now.

Transitional heats, while longer, are usually fertile. You just have to faithfully follow them since the mare will ovulate a day or so from the end of the heat cycle. That can obviously mean a lot of teasing, palpating and/or ultrasounding.

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post #4 of 4 Old 11-23-2014, 04:32 PM Thread Starter
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Thank you both of you for your comments ,follicle size ranges between 34 - 36 and very slow.
Thanks for tips on teasing was not aware of this.
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