R

radiograph: the picture or image on film generated by X-rays.

      rainrot: a crusting skin disorder affecting your horse's saddle area, with
      tufts of crusted-together hair easily pulled out, leaving a raw crater.
      The causative organism, which has characteristics of both bacteria and
      fungi, tends to thrive in wet weather when the skin is waterlogged and
      less capable of fighting infection. It can spread to other horses by the
      use of contaminated grooming tools. Treatment usually is softening and
      removal of scabs, disinfection of affected area with iodine or
      chlorhexidine-based shampoos or rinses, strict hygiene and provision of
      dry shelter and disinfection of grooming tools. Severe or persistent cases
      might also be treated with systemic antibiotics.

RBC: Red Blood Cell Count

recumbent: lying down, reclining.

      red roan: more or less uniform mixture of white with red hairs on a large
      portion of the body of the American Quarter horse, but ususally darker on
      head and lower legs; can have red, black or flaxen mane and tail.

      reins: long straps, usually made from leather, that are connected to the
      bit and used by the rider to control the horse.

      reserve: a minimum price, set by the consignor, for a horse in a public
      auction.

      respiratory system: organ system responsible for transporting air from
      nostrils to lungs and for absorption of oxygen and excretion of carbon
      dioxide.

ride short: using short stirrups.

      ridgling ("rig"): a term describing either a cryptorchid or a monorchid.
      Also spelled "ridgeling."

      ring bone: osteoarthritis of joints between the pastern bones ("high ring
      bone") or just above the coronet ("low ring bone").

     ringworm: a fungal infection of the horse's skin, contagious to other
     horses and to other animals (including humans). The main sign of ringworm
     is patchy hair loss without itching. Treatment can include clipping hair
     from affected areas, daily bathing with iodine-based shampoo, possible
     application of topical antifungal preparations after each bath, strict
     maintenance of dry shelter and exposure to sunlight whenever possible. For
     severe cases, oral administration of anti-fungal medications may be
     necessary.

   roan: a horse color where the majority of the coat of the horse is a
    mixture of red and white hairs or brown and white hairs. The mane, tail
     and legs may be black, chestnut or roan unless white markings are present.
     roaring (laryngeal hemiplegia): a whistling sound made by a horse during
     inhalation while exercising. It is caused by a partial or total paralysis
     of the nerves controlling the muscles that elevate the larynx. In severe
     cases, a surgical procedure known as laryngoplasty or "tie back surgery"
     is performed, in which a suture is inserted through the cartilage to hold
     it out of the airway permanently. Paralysis almost exclusively occurs on
     the left side, most frequently in horses over 16 hands high.

rogue: ill-tempered horse.

run down: abrasions of the heel.

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