Breeding Evaluation of French Trotters According to Their Race Earnings: 1 - Present Situation

B. Langlois

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Breeding Evaluation of French Trotters According to Their Race Earnings

1 - Present Situation

In: State of Breeding Evaluation in Trotters

Author:

B. Langlois

B. Langlois Station de Génétique quantitative et appliquée INRA - Centre de Recherches de Jouy-en-Josas 78350 Jouy-en-Josas

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Type:: Chapter

Pages:: 27–40

DOI:: https://doi.org/10.1163/9789004684676_005

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Summary

After a brief summary of French research on genetics of trotters an indexation method based on the use of race earnings is given in this report.

We propose the calculation of a yearly index which is rather similar to ESTES’ “earning index” but normalized by a logarithmic transformation and expressed in points of mean 100 and standard deviation 20. Individual yearly average earning per start is expressed as a percentage of the variable for horses of the same age-sex-year group. The distribution of this ratio is then normalized, standardized for each age class and expressed in points.

These values are then used to index breeding animals by an adaptation of conventional methods related to random mating to unusual situations of assortative mating.

Stallions are estimated according to the mean of their own performances, the mean of their offspring and the mean of their mated mares; the mares are only estimated from their own performances and horses without any earning are estimated by a pedigree index computed from the indexes of their two parents.

We finally discuss the advantages and disadvantages of the proposed temporary solution while waiting for the use of animal model BLUP estimations which are commonly applied to sport horses in France.

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State of Breeding Evaluation in Trotters

E-Book ISBN:: 9789004684676

Publisher:: Wageningen Academic

Print Publication Date:: 01 Jan 1989

Subjects
- Life Sciences
  - General
  - Animal & Veterinary

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Breeding Evaluation of French Trotters According to Their Race Earnings

1 - Present Situation

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State of Breeding Evaluation in Trotters

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