Assisted Breeding

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Rosehill Farm Veterinary Practice offers a comprehensive service to mare owners wishing to put their mares in foal. Dr. Anne Jacobson has had extensive experience (25years) as a equine reproduction veterinarian, and brings her expertise and knowledge to the Ballarat area.

Artificial insemination and other assisted breeding techniques, when used correctly, can give you access to many stallions locally and from remote locations, minimise the difficulties of attaining a pregnancy, and extend the breeding life of your mare.

At Rosehill we collect from stallions and inseminate mares with fresh semen (minutes to hours after collection); order and receive chilled transported semen from all over Australia and New Zealand for insemination (8-36 hours after collection); and receive and store cryopreserved (frozen) semen for thawing and insemination (up to many years after collection).

The successful pregnancy rate of AI is better than natural service when fresh semen is used. When the semen is chilled and shipped, pregnancy rates are usually still excellent - depending on the stallion, as some stallions' semen does not respond well to being chilled.

Frozen semen AI can also have good results, although the expected pregnancy rate per cycle is slightly lower than for fresh or chilled semen AI.

Pregnancy rates for different types of AI can be measured as CYCLES PER PREGNANCY, where a cycle is that period during which the mare is inseminated, ending in an ovulation. A mare may be inseminated more than once on a single cycle. If she has a positive early pregnancy test after being served and ovulating on a single cycle, she has gone in foal at the

rate of 1 Cycle per Pregnancy.

Over large numbers of mares, an average pregnancy rate of less than 2 Cycles per Pregnancy is considered to indicate a good level of breeding efficiency of an AI operation.

At Rosehill in 2008-9 we achieved an average rate of 1.74 cycles per pregnancy over 196 pregnancies. This rate included mares served with thawed frozen semen as well as chilled and fresh, and also a small number of pregnancies established in recipient mares via embryo transfer.