February 2019 - Drug Testing in the Horse
Are you looking forward to your first horse show later this year? Or do you have questions regarding what medications can and cannot be used prior to competition? Join us this month as our expert, Dr. Thomas Tobin, answers your concerns regarding equine drug testing.
Click here to read this month's questions and answers.
Is there any research to support the practice of prophylactic oil drenching to prevent sand colic?(View Answer)
The only product I am aware of that is reported to help with sand accumulation is psyllium. Amy Constantine, DVM, Antioch, Tenn.
My 5-year-old Mustang gelding is currently being fed one flake of alfalfa hay, twice daily. I want to switch him over to grass hay. How should I go about this to avoid having him colic?(View Answer)
The best way is to do it gradually over the course of about 10-14 days to allow his system time to acclimate to the new food. This can be done by starting with a few handfuls of grass hay for a couple days added to his alfalfa meal, then a quarter flake, half a flake, etc. while decreasing the amount of alfalfa until the ratio becomes all grass hay. Amy Constantine, DVM, Antioch, Tenn.
Should a colic exam include a rectal examination? If one is not done, how can the cause be determined in the field?(View Answer)
Practitioners differ on this question. Some vets include it with every colic workup no matter what, and others include it only when they need to go a step further into the problem. Whether a rectal is done depends on the situation, how severe the colic episode is, if an exam can be done safely for both the doctor and the horse, etc. If the horse is mildly colicky or will not tolerate rectal palpation without sedation, I may not do a rectal as part of my initial diagnostics. The potential risks of any rectal exam do include death from a tear so for me, I am more likely to pass a stomach tube before doing a rectal. Even when a rectal is done, you can't always determine the cause of colic based on that alone since no one's arm is long enough to feel all of the internal organs; it's used as part of the whole clinical exam. Amy Constantine, DVM, Antioch, Tenn.
Is there any merit to claims that chia seeds are helpful for equine ulcers, in either fore or hindgut?(View Answer)
I'm not aware of any research in horses about chia seeds and ulcers. I looked on one company's site (Equine Chia), and they seem to be promoting its use based on results in people (who have very different digestive tracts from horses) and on the Omega-3 properties, which are known to be anti-inflammatory. The only real proven treatment for gastric ulcers is Gastrogard. Amy Constantine, DVM, Antioch, Tenn.
I have a 3-year-old OTTB that traveled from Ireland to Kentucky and then to Wisconsin and most recently Kansas about 2 weeks ago. I had him on Ranitadine for 5 days when he got to Kansas. I have not been working him hard since he needs to gain weight but now he has become sour in his disposition when I ask him to trot. I am wondering if I should treat him for ulcers.(View Answer)
The only sure way to diagnose gastric ulcers is to perform a gastroscopy where a flexible camera is passed into the horse's stomach. Many veterinary clinics have the means to do this, and it is a fairly easy procedure to perform in a clinic setting. That being said, it is common practice to put a horse on a trial of Gastrogard (Ulcergard is for prevention, not treatment), for about a month and see if the horse's clinical signs improve. Amy Constantine, DVM, Antioch, Tenn.
Can colic be prevented and if so, how? What makes a horse more susceptible to colic and what are indicators that my horse might be colicking?(View Answer)
Unfortunately, there is no way to 100% prevent a horse from colicking because there are such a wide variety of causes. Colic, at its most basic means "abdominal pain," and this can vary from a simple gas colic to a strangulating intestinal lesion that requires surgery. I think the main thing that makes horses susceptible is frequent or rapid changes in feeding or activity level. Feed changes include getting a new batch of hay because even if it's from the same grower, the nutrition level may be very different from the previous batch. A horse's intestinal tract contains lots of bacteria that are critical to the efficient digestion process, and changing feed too quickly can alter this bacterial population in a bad way. Signs of colic include pawing, looking back at the flank, sweating, inappetence, frequent laying down and getting up, and rolling. If your horse is showing any of these signs, call your veterinarian immediately. Amy Constantine, DVM, Antioch, Tenn.