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Báo cáo khoa hoc:" Genetic parameters of eventing horse competition in France"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Genetic parameters of eventing horse competition in France | Genet Sei. Evol. 33 2001 175-190 INRA EDP Sciences 2001 175 Original article Genetic parameters of eventing horse competition in France Anne Ricard Isabelle Chanu Institut national de la recherche agronomique Station de Génétique quantitative et appliquée 78352 Jouy-en-Josas Cedex France Received 7 June 2000 accepted 26 September 2000 Abstract - Genetic parameters of eventing horse competitions were estimated. About 13 000 horses 30000 annual results during 17 years and 110000 starts in eventing competitions during 8 years were recorded. The measures of performance were logarithmic transformations of annual earnings annual earnings per start and annual earnings per place and underlying variables responsible for ranks in each competition. Heritabilities were low 0.11 0.17 for annual results 0.07 for ranks . Genetic correlations between criteria were high greater than 0.90 except between ranks and earnings per place 0.58 or per start 0.67 . Genetic correlations between ages from 5 to 10 years old were also high more than 0.85 and allow selection on early performances. The genetic correlation between the results in different levels of competition high international and low amateur was near 1. Genetic correlations of eventing with other disciplines which included partial aptitude needed for eventing were very low for steeplechase races 0.18 and moderate with sport jumping 0.45 dressage 0.58 . The results suggest that selection on jumping performance will lead to some positive correlated response for eventing performance but much more response could be obtained if a specific breeding objective and selection criteria were developed for eventing. horse eventing heritability rank 1. introduction In France the most popular sport for riding horses is the jumping competition. But eventing is also a sport with a good participation more than 4 000 horses compete each year. This sport combines dressage jumping and cross which is a natural circuit of some kilometres with natural