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in Journal of the American Veterinary Medical Association

Summary

Medical records of 59 racehorses with noncomminuted midsagittal proximal phalanx fractures repaired by means of lag screw fixation between 1973 and 1991 were reviewed. Fractures were classified as short incomplete fractures (7), long incomplete fractures (32), complete fractures extending into the proximal interphalangeal joint (13), and complete fractures extending through the lateral cortex of the proximal phalanx (7). Time from fracture repair to first race following fracture repair, number of racing starts, and fastest race times before and after surgery were obtained from race records and compared among horses grouped by fracture type and between horses that returned to racing and those that did not race. Five horses with short incomplete fractures, 21 horses with long incomplete fractures, 6 horses with complete fractures extending into the proximal interphalangeal joint, and 5 horses with complete fractures extending to the lateral cortex returned to racing. A significantly lower percentage of horses returned to racing following repair of complete fractures extending into the proximal interphalangeal joint (46%), than following repair of short incomplete fractures (71%), long incomplete fractures (66%), or complete fractures extending to the lateral cortex (71%). Time from fracture to repair for horses that returned to racing (mean, 14.7 days; range, 1 to 60 days) was not significantly different from that for horses that did not race (mean, 5.8 days; range, 1 to 21 days). For all fracture groups, median number of races before injury was not significantly different from median number of races after repair, and median fastest race time before fracture was not significantly different from median fastest race time after fracture repair.

Free access
in Journal of the American Veterinary Medical Association

SUMMARY

At birth, 24 Standardbred foals were assigned at random to 1 of 2 groups and were given a placebo supplement (group 1) or an iron supplement (248 mg of iron/treatment; group 2). Foals were given iron supplement or placebo 4 times during the second and third weeks after birth. Hematologic variables and general health were monitored until foals were 4 months old. Mean pcv in foals of both groups decreased during the first 2 weeks after birth, but values remained within adult horse reference ranges. During the first 6 weeks after birth, foal erythrocytes were smaller than adult horse erythrocytes, but foal erythrocyte glucose-6-phosphate dehydrogenase activity was greater than that in adult horses. At every measurement, indices of anisocytosis were lower in foals, compared with adult horse reference values, suggesting that foals have a homogeneous population of microcytic erythrocytes during early foalhood. In 2-week-old foals of both groups and in 4-week-old placebo-treated foals, mean serum iron concentration was lower than that in adult horses. In foals at birth and during the first 4 months, total iron-binding capacity values were above the adult reference range. In newborn foals, transferrin saturation percentage values were above the adult reference range; however, values decreased to below the reference range in foals from 2 weeks to 4 months after birth. When foals were born, serum ferritin concentration values were above the adult horse reference range, but decreased to within the reference range by the time foals were 1 day old. From 2 through 6 weeks after birth, foal ferritin concentration values were below the adult reference range. There were no significant differences between treatment groups in any variable measured. All foals remained healthy and grew as expected on the basis of comparison with the previous year's foal crop.

The development of low serum ferritin and iron concentrations, high serum total iron-binding capacity, low transferrin saturation percentage, and microcytosis in conjunction with decreasing pcv during the first 2 weeks after birth might be explained by foal depletion of iron stores. However, beneficial effects on hematologic variables were not observed in response to oral administration of 4 doses (248 mg each) of iron during the second and third weeks after birth. Apparently, most foals have sufficient body iron stores at birth and sufficient iron intake to support demands for iron during early foalhood.

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in American Journal of Veterinary Research