Abstract
Although the external conformation of wild horse hooves has been proposed as an ideal model for domesticated modern horses, histological signs of laminitis have been reported among them. With the hypothesis that the lamellar tissue of horses of Iberian origin raised in semi-feral is healthier than those raised in an intensive management system (stall confinement and high-calorie diet intake), the objective was to compare their lamellar tissues. Lamellar tissue samples were taken from the forelimb hoof of eight domesticated Mangalarga Marchador (MM) horses and from six semi-feral Marajoara (MJ) and Puruca (MP) horses. Primary epidermal lamella (PEL) and secondary epidermal lamella (SEL) were measured (length and width) in several regions, and their shapes were morphologically classified into different types. Breed groups were compared using analysis of variance, followed by Tukey or Dunn tests (P<0.05). Early signs of laminitis such as abnormal keratinization of the abaxial primary dermal lamella, tapered tips of the axial PELs, pointed tips of the SEL, nuclei condensation, and abnormal spatial orientation of the secondary epidermal basal cells (SELBC), were seen only in MM horses. MP horses had a greater interface of epidermis/dermis contact than MJ horses and more rounded nuclei in the round SELBC than MM horses. In agreement with the study hypothesis, semi-feral MJ and MP horses’ lamellae were classified as healthier than MM horses, which showed early signs of endocrinopathic laminitis.
Funder
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Publisher
Public Library of Science (PLoS)
Reference35 articles.
1. Anatomy and physiology of the inner hoof wall;CC Pollitt;Clinical Techniques in Equine Practice,2004
2. Wild horse hoof patterns offer a formula for preventing and treating lameness. 41th Proceedings of the American Association of Equine Practitioners;G Ovnicek;Lexington, KY, USA, 3th-6th,1995
3. Natural balance trimming and shoeing: its theory and application. Veterinary Clinics of North America;GD Ovnicek;Equine Practice,2003
4. The feral horse foot. Part A: observational study of the effect of environment on the morphometrics of the feet of 100 Australian feral horses;BA Hampson;Australian Veterinary Journal,2013
5. Morphometry and abnormalities of the feet of Kaimanawa feral horses;BA Hampson;New Zealand. Australian Veterinary Journal,2010