Notes on breeding miniature horses:
- A mare will typically come into heat 18 days after the last days she accepts a
stallion - if she is not pregnant.
- Mares can still show signs of interest in a stallion when even if they are
bred. Most will pin their ears and kick if they are bred.
- Breed your mares every other day. Sperm will live about 48 hours so you
don't need to breed daily.
- Some mares don't conceive until they are four or five years old, they are just
not mature enough.
- We have had many mares that need to have their cervix dilated, by the vet, in
order to conceive. Not uncommon for maiden mares.
- Regumate, synthetic progesterone, is typically used to regulate a heat
cycle. It is give for 14 consecutive days then stopped. A mare will come into heat
within 5 - 7 days.
- Once a mare has conceived, you may check their progesterone blood
levels. If the "serum progesterone level" is below 6 you should administer
3 cc of Regumate daily to maintain the pregnancy. A mare that conceives then slips,
looses, her foal by 60 days would be a good candidate for regumate.
- This year we have had several mares that are short cycling - coming into heat 10
days post breeding. This is the first year I have seen this, maybe it is due to
the weather. Our vet is seeing this with the large breeds too.
- We like to wait until a mare is at least three years old before
breeding. Some of our minis don't really reach maturity until they are four or
five years of age. Nature will have them cycling as yearlings or two year
olds. We have found that if you breed them at two they generally will not breed back
at three. They are just too young. It is similar to a young teenage
girl becoming pregnant. It is possible but not always a good thing because her
body is still developing.
- Does your stallion have both testicles dropped? If so, he is
certainly capable of siring. If you are not ready to breed your fillies keep them
separated for stallions of any age.