A quick guide to Android software and handsets. With Google's Andy Rubin announcing that there are now 500,000 activations of Android devices per day, it's clear that Google's operating system has hit the big time.
In a natural (unstimulated cycle) or Clomiphene Citrate cycle, mature follicle size is between 18 - 30 mm. If triggered, these cycles are typically triggered when follicle size is between 17-26mm (dependent of the practice and IVF lab).
I would never lutalyse a mare with a 20mm follicle however. All mares are different in the speed of maturation but in most cases, a 20mm follicle will not take longer than a week to mature. I have had a few odd cases where they will digress with severe changes of weather or a stressful event occurs with the mare.