Importance of microsatellite-based tests in the genetic evaluation of multiple-sire mating systems in beef cattle
A microsatellite panel for paternity assignment/verification was used in a Charolais herd in order to determine the importance of the correct identification of individuals involved in a multiple-sire breeding program. The microsatellite panel used was able to assign paternity with 95% confidence every time the dam, the calf and all possible sires were all included in the analysis. The lack of or wrong identification of any individual within a family resulted in no paternity assignment in 24 % of the population analyzed. In order to determine the differences associated with uncertain paternity on sire genetic parameters/values [direct genetic variance, environmental variance, direct heritability, fraction of phenotypic variance due to environmental effects, expected progeny differences (EPDs), and their accuracies], the birth weights of 32 calves born during 2000-2002 were analyzed using an animal model. Important variation (up to 47 %) was found in the effects and in the estimated genetic parameters from two databases. In one of such data bases, simulated paternities were considered. The other data base used the information from biological identification. A marked difference was observed in sire hierarchical orders, when the EPDs in each database were compared, thus emphasizing the need of using microsatellite-based paternity tests as an identification system that assures success in management/genetic improvement programs in multiple-sired beef cattle production.
| Main Authors: | , , , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias
2012
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| Online Access: | https://cienciaspecuarias.inifap.gob.mx/index.php/Pecuarias/article/view/1732 |
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