Genetics of Racing Performance in the American Quarter Horse: I. Description of the Data

Buttram, S. T.; Willham, R. L.; Wilson, Doyle E.; Heird, J.C.

doi:10.2527/jas1988.66112791x

Cited by 16 publications

(12 citation statements)

References 3 publications

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“…In contrast to Buttram et al (1988), who reported an increase in the superiority of males with increasing racing distance, in the present study no tendency towards increasing or decreasing differences between sexes according to distance was observed. Differences in racing time between sexes normally reflect different physiological characteristics of males and females while racing (Jelinek 1988).…”

Section: Fixed Effectscontrasting

confidence: 99%

“…Males were significantly superior to females at all distances. This superiority in traits related to racing time has also been reported for trotters (Ojala & Hellman 1987;Saastamoinen & Ojala 1991), Quarter horses (Buttram et al 1988;Villela et al 2002) and Thoroughbreds (Mota et al 1998). The contrast mean at all distances (0.30 s) corresponded to a difference of 1.5 body length between sexes.…”

Section: Fixed Effectssupporting

confidence: 74%

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Genetic and environmental parameters for racing time at different distances in Brazilian Thoroughbreds

Mota

Abrahão

Oliveira

2005

J Animal Breeding Genetics

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The aim of the present study was to investigate genetic parameters for racing time in Thoroughbred horses racing at distances between 1000 and 1600 m subdivided into 100-m intervals. The data provided by TURFETOTAL Ltda comprised races that occurred in the Gávea and Cidade Jardim race tracks over a period of 11 years (1992-2002) and consisted of 32,145 races and 238,890 time records. The variance components necessary to obtain the heritability and repeatability estimates of the traits studied were estimated with the MTDFREML program, and animal age at race (3 years old or younger, 4, 5 and older than 5 years), sex (male and female), number of races (1-32,145), and postposition at start (1-11) as fixed effects, and animal and permanent environmental random effects were included in a one-trait animal model. Males were significantly superior to females at all distances. Excluding the 1100 m distance, animals 4 years of age were significantly faster than the mean of the other ages for all distances analysed. Horses older than 5 years showed a significantly lower performance than the mean of the other ages for all distances analysed, except for the 1100 m. Postpositions one and two did not differ significantly from one another for any of the distances analysed. These two inner positions both together varied from the other positions depending on race length. The components of additive genetic and permanent environmental variance varied in a similar way, tending to decrease with increasing racing distance, and the other temporary environmental variance almost doubled from 1000 to 1600 m. As was the case for the additive genetic and environmental variances, heritability and repeatability estimates tended to decrease with increasing distance, indicating that selection based on racing time will be less successful when the racing distance increases.

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Section: Fixed Effectscontrasting

confidence: 99%

Section: Fixed Effectssupporting

confidence: 74%

Genetic and environmental parameters for racing time at different distances in Brazilian Thoroughbreds

Mota

Abrahão

Oliveira

2005

J Animal Breeding Genetics

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“…The same results were reported by other authors in Thoroughbreds Williamson and Beilharz, 1998;Mota et al, 2005;Sobczynska, 2006;Ekiz and Kocak, 2007) and Quarter horse (Buttram et al, 1988a).…”

Section: Heritability and Repeatabilitysupporting

confidence: 93%

Estimation of genetic parameters of racing performance in Iranian Thoroughbred horses

Bakhtiari¹,

Kashan²

2009

Livestock Science

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“…In some cases, the percentage of victories has increased and this result was found to be identical to the report of Bugislaus et al (2004). Buttram et al (1988a) has reported that the finished time may be influenced when the CW becomes 56.2 kg, and the average CW was approximately 55 kg in Quarter Horse. However, considering the Quarter Horse race that the racing distance is 320 m, the result was different from that of thoroughbred flat race.…”

Section: Resultssupporting

confidence: 75%

“…According to Tolley et al (1983) and Buttram et al (1988a), although the prize money and the order of finish are important selection traits in racehorses, they are not normally distributed; so, they argued that the records of racehorse without winning prize money, must be eliminated from the data. Also neither the prize money nor the order of finish can be used to examine effect of ratio CW/BW because they do not properly account for the environmental differences affecting the racing performance.…”

Section: Resultsmentioning

confidence: 99%

Effect of the ratio between carried and body weight on finishing time in thoroughbreds

Lee

Park

2011

Arch. zootec.

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SUMMARYSince the racehorses with excellent performance have a heavy carried weight (CW) in the current system, their finishing time does not increase along with heavier CW. As the CW increases, the finishing time decreases. Moreover, the percentage of victories also gets higher as the CW increases. Therefore, the effect of ratio CW/ BW as the ratio of carried weight to the body weight on finishing time was analyzed in order to suggest the problems of current CW system. The objective of this study is to examine the influence of CW/BW ratio on finishing time, using a total of 155 656 racing records belong to 8197 racehorses. Generally, the BW of racehorse is heavier, the potentiality as a good racehorse is higher. The fact that the ratio CW/BW is high means that most of racehorses have lighter BW. As the ratio CW/BW increases in the racing distance of 1000 m, the actual finishing time tends to increase in general. The finishing time that has run while bearing the ratio of 12.0-12.7%, has demonstrated a good racing record. When the ratio CW/BW is about 13.1% or more, it has begun to influence on the finishing time gradually. Also, the racehorse tends to have a growth potential in a long distance race when the BW is no less than 475-480 kg. Consequently, when setting a handicap, it is desirable to consider the just before raced BW of racehorse to a certain degree. RESUMENDado que los caballos de carrera con excelentes prestaciones transportan un handicap pesado (CW) en el sistema actual, su tiempo a la finalización no aumenta con handicaps (CW) aún mayores. Cuando el CW aumenta, el tiempo de carrera disminuye. Por otra parte, el porcentaje de victorias se hace mayor a medida que aumenta el CW. Por ello, el efecto de la relación CW/BW, como relación entre peso transportado y peso corporal, sobre el tiempo de la carrera fue analizado al objeto de detectar los problemas en el sistema actual de handicap. El objetivo de este estudio fue examinar la influencia de la relación CW/BW, sobre el tiempo de carrera, empleando un total de 155 656 registros pertenecientes a 8197 carreras. Generalmente si el peso corporal del caballo es más pesado, su potencial como buen caballo de carrera es mayor. El hecho de que la relación CW/BW sea alta, significa que el peso de los caballos es menor. Cuando la relación CW/BW aumenta en la distancia de 1000 m el tiempo de la carrera tiende a aumentar. Cuando la relación está entre 12,0-12,7%, se ha demostrado conseguir un buen tiempo de carrera. Cuando la relación CW/BW es de 13,1 o más, comienza a influir gradualmente sobre el tiempo de carrera. También el caballo tiende a tener un buen potencial de recuperación en una distancia larga cuando el BW no es inferior a 475-480 kg. Consecuentemente cuando se asigna un handicap, es deseable tener en cuenta el peso del caballo antes de la carrera.

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Genetics of Racing Performance in the American Quarter Horse: I. Description of the Data

Cited by 16 publications

References 3 publications

Genetic and environmental parameters for racing time at different distances in Brazilian Thoroughbreds

Genetic and environmental parameters for racing time at different distances in Brazilian Thoroughbreds

Estimation of genetic parameters of racing performance in Iranian Thoroughbred horses

Effect of the ratio between carried and body weight on finishing time in thoroughbreds

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