Summary Blood samples were taken from 20 horses competing in a 100 km endurance ride and plasma concentrations of sodium, potassium, chloride, bicarbonate and protein measured. Measurements were performed on samples taken before the ride (pre‐ride), at the mid point and end of the ride and after a 30 min recovery period (post‐ride). Sweat samples were collected from 6 horses competing in the endurance ride and 14 horses competing in a 3‐day event competition and sweat concentrations of sodium, potassium and chloride measured. There were substantial decreases in plasma electrolyte concentrations, which were greater than previously reported. Decreases from pre to post ride samples of 5 mmol/1 of sodium, 1.2 mmol/1 of potassium and 16 mmol/1 of chloride were found. These losses appeared to be related directly to sweat electrolyte concentrations, where potassium and chloride had relatively greater concentrations than in plasma. Résumé Des échantillons de sang ont été prélevés sur 20 chevaux soumis à une course d'endurance de 100 km et les concentrations plasmiques de sodium, potassium, chlore, bicar‐bonates et protéines ont été mesurées. Les mesures ont èté effectuées sur des échantillons prélevés avant la course (pre‐ride), au milieu de celle‐ci et à la fin, ainsi qu'après 30 minutes de repos (post‐ride). Des échantillons de sueur ont également été prélevés sur 6 chevaux participant à la course d'endurance et sur 14 chevaux participant à une compétition de trois jours, et les concentrations de sodium, potassium et chlore dans cette sueur ont été mesurées. On a pu noter d'importantes baisses de concentration des électrolytes plasmiques, de valeur supérieure à ce qui avait été précédemment signalé. On a effet observé entre les échantillons prélevés avant et après la course des différences de 5 mmol/1 pour le sodium, de 1,2 mmol/1 pour le potassium et de 15 mmol/1 pour le chlore. Ces pertes paraissent liées directement aux concentrations d'électrolyte dans la seuer: celle de potassium et de chlore sont relativement supérieures aux concentrations plasmiques. Résumé Es wurden Blutproben von 20 Pferden, die an einem 100 km‐Dauerritt teilnahmen, entnommen und die Natrium‐, Kalium‐, Chlorid‐, Bicarbonat‐ und Proteinkonzentration im Plasma gemessen. Diese Messungen wurden an vor dem Ritt (Vor‐Ritt), auf halber Strecke, direkt nach dem Ritt und nach einer 30‐minütigen Erholungspause nach dem Ritt (Nach‐Ritt) entnommenen Proben durchgeführt. Außerdem wurden Schweißproben von 6 am Dauerritt und von 14 an einem 3‐Tage‐Turnier teilnehmenden Pferden gesammelt und die Konzentration von Natrium, Kalium und Chlorid im Schweiß gemessen. Hierbei wurde eine beträchtliche Abnahme bei den Plasma‐elektrolyt‐Konzentrationen festgestellt, die stärker war als bisher berichtet. Beim Vergleich von Vor‐Ritt‐Proben mit Nach‐Ritt‐Proben wurde eine Abnahme um 5 mmol/1 bei Natrium, um 1,2 mmol/1 bei Kalium und um 16 mmol/1 bei Chlorid festgestellt. Diese Verluste schienen in direkter Beziehung zu den Schweißelktrolyt‐Konzentrationen zu stehen, wofür...

Summary Seventeen cases of guttural pouch mycosis (including two bilaterally affected cases) were diagnosed in a three year period. The presenting signs were, in order of frequency, epistaxis at rest, nasal catarrh, pharyngeal paralysis, ipsilateral laryngeal hemiplegia, swelling of the submandibular/parotid region, extension of the head and neck and dyspnoea. Ligation of the origin of the internal carotid and occipital arteries was attempted in 10 of the cases exhibiting epistaxis. Bilateral ligation was performed on one animal with an untoward sequelae. Where surgery was successfully completed further haemorrhage was prevented in eight out of nine affected pouches (89 per cent). Medical treatment involving local administration of various antifungal preparations via a specially designed catheter and/or the oral administration of benzimidazole drugs was successful in eliminating the mycotic plaque in most cases. Cases which presented with pharyngeal paralysis were all fatal.

Abstract— Alopecia universalis was diagnosed in a 3‐year‐old brown Percheron mare. Clinical and histo‐pathologic findings in this previously unreported condition in the horse are described.

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Bilateral superior check ligament desmotomy was performed on 31 Thoroughbred and 17 Standardbred horses as the sole method of treatment for superficial digital flexor tendonitis. Horses resumed racing between 6 and 19 months after surgery. Horses that were able to compete in 5 or more races without injury to the tendon again were considered to have had a successful return to racing. Twenty-five Thoroughbreds were suitable for later study and 13 of these (52%) raced on 5 or more occasions. Fifteen Standardbreds were suitable for later study and 10 of these (66%) raced on 5 or more occasions. Within the racing industry it is generally thought that about 20 to 30% of horses with superficial digital flexor tendonitis can return to racing after a prolonged rest. The results of this study suggest that bilateral superior check ligament desmotomy may improve the prognosis for a horse returning to racing after injury to the superficial digital flexor tendon.