CSIRO PUBLISHING Special Issue: EQUINE SCIENCE Animal Production Science, 2020, 60, 2069–2079 Perspectives on Animal Biosciences https://doi.org/10.1071/AN17685 Equine musculoskeletal development and performance: impact of the production system and early training Chris W. Rogers A,C, Charlotte F. Bolwell A, Erica K. Gee A and Sarah M. Rosanowski B AEquine Research Centre, School of Veterinary Science, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand. BDepartment of Infectious Diseases and Public Health, College of Veterinary Medicine and Life Sciences, City University of Hong Kong, Kowloon Tong, Hong Kong, SAR. CCorresponding author. Email:
[email protected] Abstract. The welfare debate around horse racing appears to be focussed on musculoskeletal injury and the racing of 2- year-olds. Much of this debate appears contrary to the evolutionary history of the horse as a cursorial animal and the capability of the equine musculoskeletal system to respond to the demands of race training. Epidemiological studies have reported that 2-year-old racehorses have a longer time period from entering training to the first race and a greater number of lost training days than older horses. However, this is, in part, due to the time taken to learn to train and the impact of dorsal metacarpal disease, which is due to loading of naïve as opposed to immature tissue. Across several racing jurisdictions and codes, it has been demonstrated that horses that train and race as 2-year-olds have longer, more successful, careers than those that start racing later in life. This positive trend has also been observed with horses starting in equestrian sport at an early age.