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A Bayesian analysis of response to selection for uterine capacity in rabbits

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Abstract:

A divergent, eight generation selection experiment on uterine capacity in rabbits was performed. Rabbit does were ovariectomized unilaterally before puberty, and selected for increased and decreased litter size by ‘best linear unbiased prediction’ using data from up to four parities. Two different analyses were performed to estimate the response to selection. The first was based on least squares analysis; the second was based on Bayesian methods using Gibbs sampling techniques. Three different priors were used for variance components, but these had little influence on the results. Posterior means of heritabilities for uterine capacity, varied from 0.09 to 0.12, and repeatabilities from 0.18 to 0.22. The response to eight generations of selection was symmetrical and led to a divergence of 0.16 young rabbits per generation, which amounts to about 2% of the average litter size of the base population per generation. The pattern of response however, was not linear: a high initial response was followed by a period where little further response was observed, and a final burst of response was obtained during the last two cycles of selection.

French
Análisis Bayesiona de la Respuesta a la selección por capacidad uterina en conejos

Se llevó a cabo un experimento de selección divergente por capacidad uterina en conejos. Las conejas fueron ovariectomizadas unilateralmente antes de la pubertad, y fueron seguidamente seleccionadas para aumentar y disminuir el tamaño de camada mediante un BLUP que incluía datos de hasta el cuarto parto. Se realizaron dos tipos de análisis para estimar la respuesta, el primero basado en mínimos cuadrados y el segundo en técnicas bayesianas con la ayuda de muestreo de Gibbs. Aunque tres a prioris diferentes fueron usados para las componentes de varianza, esto apenas influyó en los resultados, pues las medias posteriores para las heredabilidades variarton de 0.09 a 0.12 y las medias de las repetibilidades variaron de 0.18 a 0.22. La respuesta a ocho generaciones de selección fue simétrica y condujo a una diverjencia de 0.16 conejos por generación, lo que representa un 2% de la media de la población base por generación. La respuesta no fue, sin embargo, lineal: una fuerte respuesta inicial fue seguida de un periodo de estancamiento y una nueva respuesta en los dos últimos ciclos de selección.

Document Type: Research Article

DOI: http://dx.doi.org/10.1046/j.1439-0388.2001.00281.x

Affiliations: Departamento de Ciencia Animal; Universidad Politécnica de Valencia,Valencia Spain

Publication date: April 1, 2001

bsc/jbg/2001/00000118/00000002/art00003
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