I agree with what everyone else says, the last breeding seminar i went to said the conception for pasture breeding was 90%, hand breeding 80%, AI dropped to 60%, and that was dependent on the knowledge of the person doing it, sooooo.... that kinda tells me Mother Nature does her job better than we do.
HOWEVER, if you have a mare that has a hard time clearing the debree after breeding( as you know this is not a sterile act) pasture breeding is NOT the way to go. Breeding creates an inflammatory response that takes about 24 hours to clear, so breeding more often that once 24 hours, the stallion may as well ejaculate on the ground because that breeding is useless.
I have used a flush that Dr. Blackwelder at the Statesville equine and Bovine center in Statesville NC told me to use, and he is kinda known as the repo man. It is 5 ml of PCN 300,000 units per ML, and Amikacin 2 ml in 100 to 150 ml of sterile water if the mare is under 10 years old infuse one time wait 48 hours and if the mare is still in heat breed her. If the mare is OVER 10 years old infuse her with this medicine 3 days in a row wait 48 hours, and IF the mare is still in heat, breed her.
i ask Dr. Blackwelder if i should culture/biopsy her, and he said well.... you can.... if you have alot of extra money burning a hole in your pocket, but even if we did the culture and biopsy he is STILL going to flush her with these meds in this fashion, and Dr. Blackwelder said "if this flush does NOT cure the problem, you dont want the mare!!
I have used this for several "problem" mares and my friends have used this flush and have had EXCELLENT results
By the way flushing is EASY,a nd was much easier for me to learn than reading ultrasounds. WASH the mare well, find the cervix which is the only thing up in the vagina, and when the mare is in heat you can easily stick your finger in it to guide the sterile pipet, EASY just too EASY , completely IDIOT proof ANYONE and i mean ANYONE can do this once shown. EASY, EASY, EASY
If anyone wants Dr. B's phone number 1-704-873-1743