## 4 Discussion  
It has been shown that approximately 800,000 horses are slaughtered globally each year [16]. According to the 2009-2010 and 2012 US Horse Industry Surveys, respondents identified the unwanted horse problem as the most crucial issue facing the US horse industry [17]. [PERSON] et al. [18] investigated whether the characteristics of individual horses could be used to predict which unwanted horses are more attractive; they concluded that nonprofit equine rescue and sanctuary facility capacity are limiting factors to continue to care for the unwanted horses in the United States [17]. In Korea, about 1700 retired horses are produced every year, but most of them are traded at a bargain price, and even racehorses with a handsome price of USD 1 million per horse are sold for between USD 1000 and USD 2000 when they retire. horses sold at low prices are deprived of welfare and treatment, \begin{table}
\begin{tabular}{c c c c c c c c c} \hline  & **Walk** & **Walk** & **Center** & **Center** & **Center** & **t** & **\(p\)** \\  & **(Before)** & **(After)** & **t** & **(Before)** & **(After)** & **(After)** & **t** & **\(p\)** \\ \hline E1 & \(75.54\pm 7.98\) & \(71.54\pm 9.54\) & 2.272 & 0.030 \({}^{*}\) & \(66.65\pm 10.19\) & \(63.43\pm 8.73\) & 1.534 & 0.146 \\ E2 & \(79.38\pm 7.47\) & \(75.21\pm 9.23\) & 2.534 & 0.016 \({}^{*}\) & \(66.12\pm 10.26\) & \(61.98\pm 9.66\) & 2.176 & 0.043 \({}^{*}\) \\ E3 & \(75.90\pm 8.70\) & \(72.41\pm 8.68\) & 2.226 & 0.033 \({}^{*}\) & \(66.13\pm 10.06\) & \(61.60\pm 10.34\) & 2.317 & 0.033 \({}^{*}\) \\ E4 & \(78.32\pm 7.61\) & \(74.67\pm 7.97\) & 2.277 & 0.030 \({}^{*}\) & \(68.73\pm 10.83\) & \(63.56\pm 11.38\) & 1.967 & 0.066 \\ E5 & \(74.87\pm 8.82\) & \(70.63\pm 9.99\) & 2.352 & 0.025 \({}^{*}\) & \(72.84\pm 11.99\) & \(63.38\pm 9.27\) & 2.660 & 0.022 \({}^{*}\) \\ E6 & \(78.91\pm 7.88\) & \(74.88\pm 9.41\) & 2.098 & 0.044 \({}^{*}\) & \(73.12\pm 13.28\) & \(60.90\pm 6.28\) & 2.790 & 0.032 \({}^{*}\) \\ E7 & \(74.93\pm 7.04\) & \(70.85\pm 10.54\) & 2.182 & 0.037 \({}^{*}\) & \(72.32\pm 13.68\) & \(61.95\pm 6.40\) & 2.088 & 0.091 \\ \hline E8 & \(78.10\pm 6.62\) & \(74.72\pm 8.11\) & 2.385 & 0.023 \({}^{*}\) & \(71.64\pm 10.90\) & \(66.23\pm 6.89\) & 1.414 & 0.217 \\ Average & \(76.98\pm 6.67\) & \(73.11\pm 8.27\) & 2.688 & 0.011 \({}^{*}\) & \(68.65\pm 10.34\) & \(63.89\pm 9.94\) & 2.072 & 0.053 \\ \hline \end{tabular} \({}^{*}\): \(p<0.05\).  
\end{table} 
Table 4: Head–neck angles. Unit: degrees. Figure 5: The displacement between the center of the head and the center of the neck. \({}^{*}\): \(p<0.05\). and there are accidents in which they die while being abused in places unrelated to racing. Although there are many studies about Thoroughbred health issues during racing, there is a scarcity of research-based data on what happens after retirement [4]. In particular, there are no studies on the effect of retraining for the conversion of saddle horses after retirement from racing. This study aimed to biomechanically examine the effects of 12-week retraining for the saddle horse conversion on the horse's gait in retired Thoroughbred racehorses. This study also includes both the saddle horse conversion training plan and a horse gait analysis because biomechanical researchers have not observed changes in horse gait variables after retraining. The retraining program applied to the Thoroughbreds in this study induced significant changes in the kinematic parameters. After training, retired Thoroughbred racehorses had shorter stride lengths and a reduced center of mass displacement, center of head displacement, displacement between the center of the head and the center of the neck, and head-neck angles, bearing in mind that no significant differences in the duration of gaits and the center of mass and head velocities were observed. According to [PERSON] and [PERSON] [19], there is an ideal stride length for human movement that consumes the least amount of oxygen preferred by runners. Deviations from the ideal stride length cause excessive oxygen consumption.