Green Prairie Animal Hospital · Large Animal & Equine Care · Mason County, IL
You’re looking for equine reproduction and breeding services in central Illinois and you want to know who’s qualified, what they offer, and how far you’d be hauling. Green Prairie Animal Hospital’s San Jose clinic is the equine reproductive veterinary resource for Mason County and the surrounding region — with farm call capability that means for most reproductive work, you’re not hauling at all.
Here’s what the program covers.
Mare Reproductive Evaluation — Before the Season, Not During It
The mares that get evaluated before breeding season opens are the ones that produce foals at the end of it. Finding a uterine infection, a conformation problem, or an ovarian abnormality in February is a correctable situation. Finding it in May after two failed cycles is an expensive one.
Pre-breeding reproductive exams cover the full picture of mare reproductive health. Transrectal ultrasound — an ultrasound probe used rectally to visualize the ovaries and uterus — shows follicle development, uterine condition, fluid accumulation, and structural issues that affect breeding decisions. Uterine culture and cytology identifies bacterial infection and inflammation before it costs you a cycle. Perineal conformation evaluation identifies mares that need Caslick’s procedure — a minor surgical correction that prevents environmental contamination from entering the reproductive tract.
None of this requires hauling. The San Jose team does farm calls across Mason County and the surrounding region. Mare reproductive exams happen at your facility.
Ovulation Timing and Artificial Insemination
A mare’s egg is viable for roughly eight to twelve hours after ovulation. Everything in an active breeding program is organized around hitting that window accurately.
Serial ultrasound monitoring tracks follicle growth every one to two days as ovulation approaches. Ovulation induction — administering hCG or deslorelin once a follicle reaches appropriate size — triggers ovulation within a predictable 36 to 48 hour window. This is the tool that makes shipped cooled semen programs work reliably. Without it, coordinating semen shipment with a biological event that varies by days produces inconsistent results.
Artificial insemination with fresh, fresh-cooled, and frozen semen is available through the San Jose clinic. Each type has different handling requirements and timing implications:
Fresh semen — collected and used same day — offers the best conception rates and simplest logistics for on-property stallions.
Fresh-cooled semen — collected, extended, and shipped overnight — remains viable 24 to 48 hours after collection. Ovulation induction makes timing a shipped dose accurately reliable rather than a coordination gamble.
Frozen semen — viable indefinitely when properly stored — requires insemination within hours of confirmed ovulation and a veterinarian present at insemination time. Frozen semen breeding is a precision procedure. Loose timing produces poor results regardless of semen quality.
Stallion Breeding Soundness Evaluation
If you stand a stallion or are evaluating one for purchase, objective semen data tells you what appearance and pedigree cannot.
Stallion breeding soundness evaluation covers progressive motility — percentage of sperm moving forward normally — morphology — percentage with normal structure — total sperm per ejaculate, concentration, and physical examination of the reproductive tract. A stallion that falls below minimum thresholds on any parameter will underperform in the breeding season. You will not know he’s the problem until pregnancy rates tell you.
Semen cooling and longevity testing — evaluating how quality holds through the shipping process — is essential before committing to a shipped semen program. Some stallions that evaluate well fresh ship poorly. Finding this out during pre-season testing allows program adjustments before it costs you a breeding season.
Pregnancy Confirmation and Twin Management
Ultrasound pregnancy confirmation at 14 to 16 days post-ovulation is the standard — and the timing is specific for a reason. This is the window during which twin embryos can be identified and manually reduced before the procedure becomes significantly more complicated.
Twin pregnancies in mares almost universally end in loss of both fetuses. Manual reduction at 14 to 16 days is straightforward. At 25 days it is significantly more difficult. After 30 days it is rarely successful. Early confirmation protects the breeding investment.
Follow-up at 28 days confirms fetal heartbeat and continued development. Early embryonic loss is common enough in mares that a single early check is insufficient monitoring for a breeding that represents meaningful time and financial investment.
Serving Central Illinois Horse Owners — Farm Calls Available
Green Prairie Animal Hospital’s San Jose location serves horse owners and breeders across Mason County and the broader central Illinois region. Farm calls for reproductive work — serial ultrasound monitoring, insemination, pregnancy confirmation — mean the program runs at your facility during a time-sensitive breeding window rather than requiring repeated hauling.
As an AAHA-accredited clinic, the protocols and equipment behind every reproductive procedure meet the highest standards in veterinary medicine.
Call San Jose for Equine Breeding Services in Central Illinois
Green Prairie Animal Hospital’s San Jose location is our large animal and equine center for Mason County and central Illinois. Our team handles horses, cattle, and livestock — and we do farm calls.
