Breeding Evaluation of French Trotters According to Their Race Earnings: 2 - Prospects

Anne Tavernier

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Breeding Evaluation of French Trotters According to Their Race Earnings

2 - Prospects

in State of Breeding Evaluation in Trotters

Autor:in:

Anne Tavernier

Anne Tavernier Station de Génétique quantitative et appliquée, INRA - Centre de Recherches de Jouy-en-Josas, 78350 Jouy-en-Josas

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Art:: Kapitel

Seiten:: 41–54

DOI:: https://doi.org/10.1163/9789004684676_006

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Summary

In order to benefit from the theoretical advantage of the BLUP animal model, an across herd evaluation system was developped which reduces computation cost for a routine application to a large horse population. For a long time, trotter horses have been submitted to selection and assortative matings. The animal model is the best approach to these problems.

The model used for the log of annual earnings per start (Langlois 1984) includes an individual additive genetic component, permanent environmental and “herd x dam” effects considered as random and sex and age x year subclass effects as fixed. This “herd x dam” effect is due to the difference between the maternal and paternal components and represents the common environmental conditions shared by progeny of the same mother. The variance-covariance matrix includes the complete relationship matrix between all the animals whatever the kind of animal: recorded or non-recorded, parent or non-parent horse, males or females.

The problem is to solve the equations corresponding to all the animals after absorption of permanent environmental and herd x dam effects. The system is solved by using a particular structure of the inverse of the relationship matrix. Animals with no progeny are grouped by mare and their mares are then arranged into groups. A group of mares is made of a mare which has no identified dam, her daughers, her grand-daughters etc... The corresponding matrices are block-diagonal and are easily absorbed. The resulting system (fixed effects and stallions) is solved by iterations. An approximation of the coefficient of determination is then calculated by using matrix algebra. This evaluation system allows to compute the observed genetic change and the correlation between mates. This method is of a very great practical interest in Trotter horses:

- use of performance records in both sexes

- use of combined information from different relatives

- evaluation of all broodmares (with and without records)

- selection and assortative mating are taken into account.

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State of Breeding Evaluation in Trotters

ISBN:: 9789004684676

Verleger:: Wageningen Academic

Print-Publikationsdatum:: 01 Jan 1989

Fachgebiete
- Biowissenschaften
  - Allgemein
  - Tiere und Veterinärmedizin

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Breeding Evaluation of French Trotters According to Their Race Earnings

2 - Prospects

Summary

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State of Breeding Evaluation in Trotters

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