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ObjectivesAscertain the radiographic prevalence and variation in characteristics of juvenile osteochondral conditions (JOC) in the proximal interphalangeal joint (PIPJ) of Australian Thoroughbred racehorse yearlings. Establish whether there are any significant associations with public auction sale results and racing performance.MethodsRetrospective evaluation of 1,098 yearling repository radiograph sets. Comparison of sales results and whole career racing performance of the case group with two control groups: maternal siblings (N = 397) and yearlings without PIP JOC (N = 391).Results6.3% of yearlings had at least one PIPJ JOC lesion with 4.8% having subchondral lucencies of the proximal phalanx (P1SC), 0.6% with subchondral lucencies of the middle phalanx (P2SC) and 0.8% with osteochondral fragmentation (OCF). P1SC were more prevalent in forelimbs and P2SC and OCF were more commonly located in the hindlimbs. 51% of PIPJ JOC were not identified on a lateromedial projection (LM). A significantly lower proportion of horses with OCF were successfully sold at public auction (p ≤ 0.05) but there was no significant difference in sales price between the case group and controls. A lower proportion of horses with PIPJ JOC made it to the racetrack to race, although this was not statistically significant. There was no significant difference in racing performance between the case group and controls, although there was a trend toward case horses earning lower career prize money and lower prize money per race (p ≤ 0.1). Lesions located in a dorsal or palmar/plantar location on the LM projection earned a lower average prize money per race (p ≤ 0.05) than those in a central location, and showed a trend toward earning lower total prize money (p ≤ 0.1) and number of places (p ≤ 0.1). There was no significant difference in performance for horses with lesions at the medial, axial or lateral aspects of the articular surface.Clinical importanceOverall, the findings of this study indicate that the presence of PIPJ JOC in radiographs of Thoroughbred yearlings should be attributed a low to moderate risk to future racing performance, however certain lesion characteristics may be associated with decreased performance.

Introducción: El bienestar animal surge del conocimiento de los animales como seres que experimentan dolor, sufrimiento o estrés. La evaluación del bienestar en potros incluye aspectos como el comportamiento, la salud, y la forma en la que los animales responden al manejo. La evaluación debería detectar signos que puedan derivar en situaciones de estrés. Objetivos: Establecer las bases metodológicas para la evaluación del bienestar de potros y caballos jóvenes y evaluar el sistema de manejo de los futuros reproductores. Material y métodos: Desarrollo de un protocolo adaptado para potros, mediante la ponderación de 45 indicadores y la evaluación de bienestar de 104 potros de recría en libertad (69 machos y 35 hembras). Resultados: Con el protocolo propuesto se pudieron observar algunas desviaciones en el estado de bienestar de los animales. Los indicadores de alojamiento revelaron que había zonas de humedad y otras con riesgo de lesión. En los indicadores de alimentación, la condición corporal era adecuada ya que sólo estaba aumentada en un 21,36 % de los casos. No se observaron comportamientos anormales. Los indicadores de salud mostraron algunos casos de dolor en el dorso (23,61%), bastantes con descarga nasal (76,47%) y también algunos con descarga ocular (16,35%), así como problemas dérmicos (8,65%) resultante de picazón o rascado. Se encontró una incidencia elevada de heridas en la región de las extremidades (90,38%). Conclusión: La metodología seguida para la evaluación del bienestar ha permitido obtener una primera información y determinar problemas de salud y comportamiento de la futura población reproductora. Introduction: Animal welfare arises from the knowledge of animals as beings that experience pain, suffering or stress. The welfare assessment in foals includes behaviour, health and individual response to management. Evaluation should check for signs that may lead to stress situations. Objectives: Proposal a methodological basis for evaluating the welfare of future breeding horses and the welfare assessment of management system. Material and methods: Development of a protocol adapted to foals by weighting 45 indicators and welfare assessment of 104 foals breed in freedom (69 males and 35 females). Results: The implementation of the protocol resulted in the detection of significant deviation in the welfare of animals. Housing indicators revealed areas with wet condition and a risk of injury. Abnormal behaviours were not observed in the foal population. Health indicators revealed incidence of back pain (23.61%), nasal (76.47%) and ocular (16.35%) discharge, and a low level of alterations in the tegument (8.65%) consequence of itchiness or rubbing. A higher incidence of body lesions in the limbs was observed (90.38%). Conclusion: The protocol for welfare assessment developed in the present study provided first insights and detection of suboptimal health status and behaviour of the future breeding population.

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