The objective of this study was to determine the effects of morphometric measurements on race performance (m/sec) of Thoroughbred horses. Data of morphometric measurements (withers height, rump height, chest girth, chest width, front chest width, chest depth, neck length, shoulder length, length of withers to rump, rump length, body length, head width, head length, and cannon circumference) were taken from 244 Thoroughbred horses chosen at random. A total of 2888 racing records were considered for race performance. The effects of environmental factors on morphometric measurements (stallion, gender, age, and mother age) and race performance (gender, age, mother age, year, hippodrome, race distance, racetrack, and race type) were analyzed using the least squares method. Principal component analysis (PCA) was performed for morphometric measurements, and then the factor loadings were rotated by Varimax method. Multiple linear regression analysis was applied for the significance of the obtained factors on race performance. Significant effects for stallion on all morphometric measurements, except head length and width, and for gender on withers height, cannon circumference, and head width were determined. Race performance was significantly influenced by stallion, gender, age, year, hippodrome, race distance, racetrack, and race type. After PCA, four factors with eigenvalues >1 were attained. The effects of factors on race performance were not significant, according to the results of multiple linear regression analysis. Therefore, the effects of the morphometric measurements examined on the race performance were not significant in Thoroughbred horses.
Horses, used for various purposes for centuries, are today commonly used for sporting purposes. It is critical to identify the horses that are used in this way by using the coat color and markings on the horse. The animal material for this research consisted of 101 Arabs and 206 Thoroughbreds. The most common coat color was BAY (56.6%). The least common coat colors were BLACK (0.3%) and DUN (0.3%). The presence of head marks on horses rated 0, 1, 2, 3, 4, and 5, and the rate of presence of the head mark were 17.2%, 29.2%, 7.5%, 6.8%, 26.0%, and 13.3%, respectively. When examining leg markings, the most common mark was the half-stocking (16.9%) on the left back leg, while the stocking (1.3%) was the least frequent mark on the front right leg. According to the findings of the study, which was conducted to analyze the condition of Arab and Thoroughbred horses, bay was the most common coat color seen in horses in general. Consequently, this situation is due to the preferences of breeders and horse owners.
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