This study evaluated electrocardiographic profile of 53 Thoroughbreds, clinically healthy, with ages ranging 2-7 years old, 38 males and 15 females, all reared at the São Paulo Jockey Club, Brazil. Two electrocardiograms were recorded in each horse, and the results of mean electrical axis in frontal plane, obtained by measuring QRS complexes amplitude, were compared using two electrode position...

Although horses share similar clinical signs of acute rhabdomyolysis, numerous etiologies exist for tying-up. In Quarter Horses tying-up is often caused by a heritable glycogen-storage disorder called polysaccharide storage myopathy that can be managed by a fat-supplemented, hay-based diet, and regular daily exercise. In Thoroughbreds recurrent exertional rhabdomyolysis (RER) is often due to a ...

The mitochondrial DNA (mtDNA) molecule, carrying genes encoding for respiratory chain enzymes, is a primary candidate for demonstrating associations between genotype and athletic performance in mammalian species. In humans, variation at seven protein encoding mitochondrial loci has been implicated in influencing fitness and performance characteristics. Although thoroughbred horses are selected ...

Patterns of serum biochemical parameters vary among horse breeds. The objective of the present study was to compare serum lipoproteins of Iranian Caspian ponies with those of other horses (Arabs and Thoroughbreds) in the Iranian region. Serum lipoprotein values were determined by agar-agarose gel electrophoresis and measured by scan densitometry. Moreover, serum triglyceride and cholesterol con...

We have observed and re-evaluated the histology of the skin of the horse, using samples from four Thoroughbreds. The skin was composed of the usual three components: epidermis, dermis and subcutis. In particular, the dermis was found to have three fibrous components: a papillary layer, a reticular layer and a cordovan-leather tissue layer. The cordovan-leather tissue layer was subdivided into a...