The Horse

NOV 2018

The Horse:Your Guide To Equine Health Care provides monthly equine health care information to horse owners, breeders, veterinarians, barn/farm managers, trainer/riding instructors, and others involved in the hands-on care of the horse.

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Page 33 of 75

34 November 2018 The Horse | RUNNING HOT AND COLD horse the other direction, it will be hard to handle the heat, and he may need to be clipped. Then if there's a cold snap, he must be blanketed." For this reason Coleman says he'd rather transport horses from hot to cold climates than from cold to hot. "It takes the horse longer to adjust and acclimate to heat," he says. "When you go south, make sure the horse can sweat ad- equately. Some don't acclimate very well and may not sweat enough, and some may develop anhidrosis (the inability to sweat). If your horse is not sweating nor- mally, suffering heat stress, consult your veterinarian for help." You might have to keep the horse that's adapting to sudden heat indoors and out of the sun. "Some of the well-built barns in hot climates can keep horses cool— they're designed to take advantage of all the natural ventilation possible," says Coleman. Fans, misting fans, or air-conditioning can also help. "Fans create enough air movement to help promote a little more evaporation— to cool the body," says Connally. Another bonus is they can deter insects, which can be both a nuisance and a disease threat, exposing horses to insect-borne patho- gens they might not have encountered previously. While you should already be using core vaccines for mosquito-borne diseases such as West Nile virus and East- ern and Western encephalomyelitis, work with your veterinarian to find out if he or she recommends a booster before going to a warm climate. "In a cold climate a horse may only need boosters once a year, but there may be mosquitoes year-round in the warm climate, and his immunities may be inad- equate," says Allen. As for riding horses that have moved from cold to hot weather, Connally says to pay close attention during work and recognize they might not be able to exer- cise during the heat of the day. "Exercise adaptation (coming from a hot climate to a cold one) is actually pretty easy for the horse," adds Allen. "The reverse is more complex—taking a horse from a cool climate to a hot one. It's much harder for the horse to adjust." In addition to the heat and insects, he says the horse must acclimate to other changes, as well, such as different-tasting water that might get warmer than the horse likes and new bedding. Your biggest concern when going from south to north in winter, on the other hand, is whether your horse has an ad- equate hair coat. "His body has been coping with heat (with the blood vessels beneath the skin dissipating body heat rather than con- serving it), and it takes a while to adjust," says Connally, adding that these horses probably won't grow hefty hair coats and truly thrive until they've experienced the full transition from fall to winter. Extreme temperature fluctuations (50 degrees or more between daytime and nighttime extremes) any time of year, however, can be hard on horses. "Tem- perature swings are a stress, especially for foals," says Connally. "It can lead to scours (diarrhea) or pneumonia in young foals, but is not as hard on adults," he says. Multiple stresses combined—such as if a horse is undernourished, travel- ing, and working hard—can add to the burden of weather changes. Take-Home Message Horses are very adaptable and typi- cally can handle significant temperature swings. It's when we alter their natural condition and confine them (or don't pro- vide them with a windbreak) or haul them from one climate to another that they tend to struggle. It's up to us as respon- sible horse owners to help them adjust. h Body-Clipping Considerations If you've body-clipped your horse to keep him cool in anticipation of traveling to a hot climate, keep an eye out for skin issues. "When you clip, you abrade the skin," says Kent Allen, DVM, FEI veterinary delegate and owner of Virginia Equine Imaging, in Middleburg. "The horse will also get more sun (which he's not accustomed to) and may sunburn. He will encounter bacteria in the new environment that he hasn't been introduced to before. He'll also have new bedding and potential allergic reactions, and more skin problems, when going to a new place."—Heather Smith Thomas CAUTION: Federal law restricts this drug to use by or on the order of a licensed veterinarian. EQUIOXX® (firocoxib) is indicated for the control of pain and inflammation associated with osteoarthritis in horses. Firocoxib belongs to the coxib class of non-narcotic, non- steroidal anti-inflammatory drugs (NSAID). CONTRAINDICATIONS: Horses with hypersensitivity to firocoxib should not receive EQUIOXX. WARNINGS: EQUIOXX is for use in horses only. Do not use in horses intended for human consumption. Do not use in humans. Store EQUIOXX Tablets out of the reach of dogs, children, and other pets in a secured location in order to prevent accidental ingestion or overdose. Consult a physician in case of accidental human exposure. Horses should undergo a thorough history and physical examination before initiation of NSAID therapy. Appropriate laboratory tests should be conducted to establish hematological and serum biochemical baseline data before and periodically during administration of any NSAID. NSAIDs may inhibit the prostaglandins that maintain normal homeostatic function. Such anti-prostaglandin effects may result in clinically significant disease in patients with underlying or pre-existing disease that has not been previously diagnosed. Treatment with EQUIOXX should be terminated if signs such as inappetance, colic, abnormal feces, or lethargy are observed. As a class, cyclooxygenase inhibitory NSAIDs may be associated with gastrointestinal, renal, and hepatic toxicity. Sensitivity to drug-associated adverse events varies with the individual patient. Horses that have experienced adverse reactions from one NSAID may experience adverse reactions from another NSAID. Patients at greatest risk for adverse events are those that are dehydrated, on diuretic therapy, or those with existing renal, cardiovascular, and/ or hepatic dysfunction. The majority of patients with drug-related adverse reactions recover when the signs are recognized, drug administration is stopped, and veterinary care is initiated. Concurrent administration of potentially nephrotoxic drugs should be carefully approached or avoided. Since many NSAIDs possess the potential to produce gastrointestinal ulcerations and/or gastrointestinal perforation, concomitant use of EQUIOXX with other anti-inflammatory drugs, such as NSAIDs or corticosteroids, should be avoided. The concomitant use of protein bound drugs with EQUIOXX has not been studied in horses. The influence of concomitant drugs that may inhibit the metabolism of EQUIOXX has not been evaluated. Drug compatibility should be monitored in patients requiring adjunctive therapy. The safe use of EQUIOXX in horses less than one year of age, horses used for breeding, or in pregnant or lactating mares has not been evaluated. Consider appropriate washout times when switching from one NSAID to another NSAID or corticosteroid. The Safety Data Sheet (SDS) contains more detailed occupational safety information. For technical assistance, to request an SDS, or to report suspected adverse events call 1-877-217-3543. For additional information about adverse event reporting for animal drugs, contact FDA at 1-888-FDA-VETS, or Rev 10/2016

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