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Room 2 – Equine Stream, brought to you by Medistar

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Session Program
7:15 pm
Association of biomechanical properties of the calcified metacarpal articular surface with clinically assessable subchondral bone microstructure in thoroughbred racehorses

Non-invasive measures of bone quality and injury risk are an important area of investigation in Thoroughbred racehorses. Onset of race training in Thoroughbred racehorses is associated with adaptive improvement in biomechanical properties at the distal third metacarpal calcified articular surface. Repetitious high loading however can result in fatigue injuries of subchondral bone and calcified cartilage, particularly palmar/plantar osteochondral disease and third metacarpal/-tarsal condylar fractures. We aimed to determine the correlation between clinical computed tomography (clinical-CT) microstructural parameters, training history and calcified articular surface biomechanical properties and therefore potential fracture risk in the distal palmar third metacarpal condyle of Thoroughbred racehorses. Third metacarpal condyles were examined from 31 Thoroughbred horses, including horses in race training, resting or untrained. Samples were imaged with 100μm resolution clinical-CT (Somatom® Emotion®). Reference point indentation mechanical testing of the calcified articular surface was performed (BioDent™ Hfc). The association between indentation distance increase (IDI), an inverse measure of toughness and clinical-CT and training variables were assessed. 

7:45 pm
Predicting when the mare will ovulate is one of the key skills we need to hone as veterinarians working with mares. Regardless of the breeding system used (natural cover, fresh semen, chilled semen or frozen semen) it is vital we breed the mare at the correct time. We have two major tools to enable us to do this. Palpation and ultrasound of the follicle. Follicular size is important, but only during the first days of the follicular phase. When we are within 36 to 48 hours of ovulation, size is too variable to be the crucial parameter and we must use changes in the ultrasonographic appearance of the follicle. 
8:15 pm
The second key feature to note is endometrial edema. We must develop a recording system which allows us to monitor as the edema score increases to a peak and then decreases, usually in the hours immediately preceding ovulation. Certain mares do not follow the typical endometrial edema pattern and we must be aware of these mares to avoid missing an ovulation.

Resources

#VetFest 2020
VetFest 2020 Virtual Conference
#VetFest 2020
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