Inheritance of racing performance of trotter horses: An overview

Effect of paragenetic factors on race time in a small population of trotters

“…Racetrack effects result from some physical conditions such as the type of ground; the weather also affects track assessment, as wet tracks are heavier than dry ones. Effects also result from the reputation of the racetrack, as those with better reputations can attract higher quality horses (2). Racetrack and length-of-race factors did not account for much of the variation in best annual racing time (5).…”

“…the time taken to cover 1 mile (Standardbreds) or to cover 1 km (in Europe). A horse can be evaluated by its average time or, more commonly, by its lifetime best time (2). The most important trait for selection of racing performance was race time, due to its substantially higher heritability and its high genetic correlation to earnings (3).…”

“…The best race times of Finnish trotter populations diminish with age (4). Males had an advantage over females with respect to best times (1.6 s), times at finish (1.2 s), and money won per year (2). However, racetrack factors, resulting from some physical conditions such as the type of ground (grass is slower than sand), could also affect race times.…”

“…The effect of the racing distance on speed has been observed in countries having a wide range of differing race distances. Thiruvenkadan et al (2) observed that this factor can bias the other effects of racehorse age on race times, because younger horses race over shorter distances.…”

Consanguinidad y estimación de parámetros genéticos para morfología del caballo Lusitano en México

“…Todas las soluciones de las covariables no fueron estadísticamente diferentes de cero (p>0,05); estos resultados coinciden a los reportados por Gómez et al (2009), al analizar los efectos de las covariables F y ΔF en modelos multivariados con caracteres de morfología en el caballo de pura raza española, dado que reportaron estimaciones estadísticamente igual a cero (p>0,05) en los coeficientes de regresión lineal. Efectos de la consanguinidad sobre el comportamiento promedio de diversas variables de interés en equinos fueron discutidos por Thiruvenkadan et al (2009). Las estimacio-nes de h 2 dentro de UNV (tabla II) fluctuaron de 0,08 (en DR) a 0,30 (en CC), con un promedio general de 0,18; los cambios máxi-mos observados en los análisis en que se incluyeron los IDF fueron de 0,01.…”