Genetic and Phenotypic Parameters for Age and Speed at the Beginning of Racing Career in Trotters

Saastamoinen, Markku; Nylander, Anne

doi:10.1080/09064709609410922

Cited by 5 publications

(5 citation statements)

References 6 publications

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“…Compared to first racing season, the estimates of heritability were on the same level as obtained in whole career in Arab horses whereas difference is noticeable in Thoroughbreds. The heritabilities were considerably higher than reported by SAASTAMOINEN and NYLANDER (1996a) obtained by the REML sire model in Standardbred and Finnhorse trotters. The heritability for age at first race in Thoroughbreds agree with those reported in a previous study by SAASTAMOINEN and NYLANDER in Standardbreds (1996b) and calculated with an animal model and derivativefree REML method.…”

Section: Resultscontrasting

confidence: 71%

“…Nowadays the quick returns of the investment is very important, and this is a reason for studying this trait also in Arab horses. Age at first start reflect time needed to reach physical maturity, but also health and soundness, which are important traits to be included in breeding programmes, in addition to race track performance traits (SAASTAMOINEN and NYLANDER 1996a). Moreover, age at first start had a significant impact on career longevity (BOURKE 1995, MORE 1999, HENLEY et al 2006, SOBCZYNSKA 2007 and there was an unequivocal relation between the racing performance of the horse and the duration of its racing career.…”

Section: Introductionmentioning

confidence: 99%

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Relationship between age at first start and racing performance in Polish Thoroughbreds and Arab horses

Sobczyńska

2010

Arch. Anim. Breed.

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Genetic and phenotypic parameters for age at first start (AFS) and performance traits were estimated for Polish Thoroughbred and Arab horses using restricted maximum likelihood (REML) with an animal model. The traits representing a horse's racing performance were log of earnings (EA) and square root of number of starts (NS). Separate analyses per first racing season and whole career were carried out. The first racing season comprised 1 759 Thoroughbreds and 1 026 Arab horses. The racing results of whole racing career were available for 1 319 Thoroughbreds and 815 Arab horses. The model accounted for fixed effects of birth year, month of birth, sex and trainer. The average of AFS of Thoroughbreds was 933.2 days for first racing season and 935.1 for whole career. The same AFS was observed at first season and whole career (about 1 199 days) in Arab horses. Heritability estimates for AFS were rather low (0.15-0.21) . All genetic correlations for Arab horses between age and performance traits varied from moderate to high (from −0.25 to −0.85). For whole career of Thoroughbreds, the genetic correlations had opposite signs compared to those observed in Arabs. Genetic correlation between AFS and EA in first racing season was very low in Thoroughbreds (−0.07), whereas high between AFS and NS (−1); the corresponding values for Arab horses were −0.25 and −0.76. The opposite signs of phenotypic and genetic correlations (0.16 vs −1 and −0.24 vs 1 in first season and whole career, respectively) between AFS and NS in Thoroughbreds were observed. Phenotypic correlations between AFS and performance traits were close to zero for whole career while were rather low and moderate (−0.22 and −0.37) for first season in Arab horses. Delay of the first start of Thoroughbreds is favourable from the point of view of future racing performance in whole career and has no effect on earnings in the first racing season. Arab horses beginning their career at a young age are start frequently and earn more money then those beginning their career later. Keywords

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Section: Resultscontrasting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Relationship between age at first start and racing performance in Polish Thoroughbreds and Arab horses

Sobczyńska

2010

Arch. Anim. Breed.

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“…The number of starts had lower heritability among the different traits studied. In another study, Saastamoinen and Nylander (1994) also obtained low heritability estimates of 0.13, 0.09, 0.14 and 0.11 for number of starts, age at first qualifying start, age at passed qualifying start and age at first race respectively in Standardbred Trotter. Further, the same authors (Saastamoinen and Nylander, 1996a,b) reported that the traits viz.…”

Section: Number Of Startsmentioning

confidence: 92%

Inheritance of racing performance of trotter horses: An overview

2009

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“…The best racing time of an animal within a given period of time (year, life) reflects the maximum velocity of a horse, indicating its level in relation to all other animals that raced during the same period of time (S aastamoinen and O jala 1991). Indeed, this trait has been more extensively studied in trotting races (K almykov 1973; M inkema 1975; P hilipsson 1975; R önningen 1975; H ellman 1978; D usek 1979; K atona 1979; A rnason et al 1980; O jala and V an V leck 1981; O jala 1987; O jala et al 1987; L eyten and V an depitte 1991a; S aastamoinen and O jala 1991; P ösö et al 1994; S aastamoinen and N ylander 1994) than in Thoroughbred races (N eisser 1976; Y orov and K issyov 1976; M oritsu et al 1994). The heritability estimates reported in the literature for best racing time have ranged from low to moderate for both types of horse, although a study that used a more modern method found a value close to 0.10 for the Thoroughbred (M oritsu et al 1994).…”

Section: Introductionmentioning

confidence: 99%

Genetic and environmental factors that affect the best time of Thoroughbred horses in Brazil

Mota

Oliveira

Silva³

1998

J Animal Breeding Genetics

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Summary On the basis of information provided by the Brazilian Association of Race Horse Breeders, we analysed the racing performance of 947 Thoroughbred horses in races held from 1985 to 1992. The performance was evaluated using the best time of the animals. The variance component was obtained by the derivative‐free restricted maximum likelihood method, and the model used contained fixed effects of the racing month and year, sex, race track, track condition, animal age, number of competitors in race, and distance, and the random animal effect. The low heritability estimate obtained (0.12) indicates that selection based on animal phenotypic value must induce small genetic changes in this trait. Zusammenfassung Die Analyse wurde an Rennergebnissen von 947 Vollblutpferden aus den Jahren 1985 bis 1992 durchgeführt, die von der Brasilianischen Rennpferdzüchtervereinigung zur Verfügung gestellt worden waren. Die Leistung wurde an den Bestzeiten der Tiere bewertet. Varianzkomponenten wurden mittels ableitungsfreier Maximum Likelihood Methode geschätzt. Das zugrunde liegende Modell enthielt Rennmonat und‐jahr, Geschbecht, Rennbahn und deren Zustand, Tieralter, Zahl gelaufener Pferde und Distanz als fixe Wirkungen und Tiere als zufällige. Der geringe Heritabilitätswert (0.12) läßt nur geringe genetische Änderungen auf der Basis phänotypischer Selektion erwarten.

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Genetic and Phenotypic Parameters for Age and Speed at the Beginning of Racing Career in Trotters

Cited by 5 publications

References 6 publications

Relationship between age at first start and racing performance in Polish Thoroughbreds and Arab horses

Relationship between age at first start and racing performance in Polish Thoroughbreds and Arab horses

Inheritance of racing performance of trotter horses: An overview

Genetic and environmental factors that affect the best time of Thoroughbred horses in Brazil

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