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espanolLos efectos del gen BMP15, localizado en el cromosoma X, sobre la media y la variabilidad de la prolificidad fueron estimados en la poblacion Rasa Aragonesa, donde se analizaron 918.956 partos de ovejas de distintos genotipos (heterocigotas para el alelo FecXR o ROA®; y no portadoras). En primer lugar, se utilizaron modelos umbral que incluian o no el efecto del gen para estimar el efecto del genotipo BMP15 y su contribucion a la variabilidad genetica de la prolificidad en esta poblacion. Tambien se utilizaron otros dos modelos para estimar las interacciones entre el genotipo y los poligenes, asi como el efecto del genotipo sobre la variabilidad de la prolificidad. Todos los analisis se hicieron con el programa ASReml. El efecto del genotipo sobre la media fue de 0,32 corderos adicionales por parto cuando el alelo ROA® se encontraba presente. Debido a que durante muchos anos la seleccion por prolificidad en esta poblacion se ha llevado a cabo desconociendo la presencia de esta mutacion, los animales selectos portadores tienen un valor genetico poligenico residual mas bajo que los no portadores. No se encontro interaccion significativa entre el genotipo y los efectos poligenicos sobre el valor genetico. Aunque la interaccion entre el genotipo y el conjunto de umbrales fue significativa, la diferencia entre ambos genotipos en la varianza de la prolificidad sobre la escala observada a una prolificidad media dada es escasa y muy poco relevante EnglishThe effects of the BMP15 gene, located on the X chromosome, on mean prolificacy and its variability, were estimated in the Rasa Aragonesa sheep population through the analysis of 918,956 lambing records from ewes of different genotypes (FecXR or ROA® heterozygous ewes; and non-carrier ewes). Threshold models including or not the gene effect were first run to determine the effect of the BMP15 genotype and its importance in the total genetic variability of prolificacy. Two other models were also run to estimate the interaction between the BMP15 genotype and the polygenic background, as well as the effect of the genotype on the variability of prolificacy. All the models were run using the ASReml software. The effect of the presence of the ROA® allele of the BMP15 gene on the mean prolificacy was 0.32 extra lambs per lambing. Due to the selection on prolificacy performed during many years in this population ignoring the presence of this major gene, animals carrying the mutation were found to have lower remaining polygenic estimated breeding values than non-carrier animals, and there was no interaction between the BMP15 genotype and the polygenic background. Although the interaction between the genotype and the set of thresholds was significant, the resulting between-genotypes difference of variance of prolificacy on the observed scale, at a similar mean litter size, was very low and not relevant

Relaciones entre los efectos del gen BMP15 y los efectos poligénicos sobre la prolificidad en la raza ovina rasa aragonesa