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Se utilizaran eyaculados procedentes de machos de la linea R (linea de conejos seleccionada por velocidad de crecimiento durante el periodo de engorde)alojados en diferentes centros de inseminacion artificial. Una vez recuperados los eyaculados se procedera a su valoracion y una muestra de todos ellos sera crioconservada. La calidad seminal sera de nuevo valorada tras el proceso de congelacion. Junto con los analisis seminales se utilizaran los datos de crecimiento y pedigree de los machos y de todos los animales de la linea R desde su fundacion para estimar por un lado los parametros geneticos de las variables relacionadas con la produccion y calidad de dosis seminales en fresco y tras un proceso de crioconservacion y la correlacion genetica existente entre las variables seminales anteriormente citadas y la velocidad de crecimiento. A su vez se estimara mediante un modelo recursivo la relacion entre las variables seminales en fresco y tras la descongelacion.; The general aim of this thesis was to study the genetic determinism for some traits related to artificial insemination (AI) dose production of fresh and frozen-thawed semen, in order to explore the interest and limitation of different strategies for their genetic improvement in a paternal line of rabbits selected for growth rate during the fattening period (28-63 days).In chapter 1, genetic parameters of sperm production traits are estimated as well as the genetic relationship with daily gain (DG). The heritabilities (h2) of the semen traits were 0.13±0.05, 0.08±0.04 and 0.07±0.03 for ejaculate volume (V), sperm concentration (CN) and sperm production (PROD) per ejaculate, respectively. A favourable and moderate genetic correlation was observed between V and DG (0.36±0.34). From this chapter it may be concluded that if a seminal trait is to be included as a selection objective, a useful one could be sperm production, as it is a trait in which both volume and concentration are included. Moreover, there is currently no evidence to suggest that selection for DG in rabbits will affect sperm production adversely.The aim of chapter 2 was to explore the genetic determinism of some sperm quality traits and their genetic relation with the selection criteria of the paternal rabbit line. The heritabilities (h2) of semen quality traits commonly evaluated in a classic spermiogram were 0.18, 0.19 and 0.12 for NAR (%, percentage of sperm with intact acrosome), ANR (%, percentage of sperm abnormalities) and MOT (%, percentage of total motile sperm cells) respectively. We also estimated the h2 of some motion CASA parameters 0.09, 0.11, 0.10, 0.11, 0.11 and 0.11 for VAP (µm/s; average path velocity), VSL (µm/s; straight-line velocity), VCL (µm/s; curvilinear velocity), LIN (%, linearity index), ALH (µm; amplitude of the lateral head displacement), STR (%, straightness). Genetic correlations between DG and semen traits showed a high HPD95% (interval of highest density of 95%). However there is some consistent evidence of the negativity of the genetic correlations of DG with…

Genetics of fresh and frozen-thawed semen traits and their relationship with growth rate in rabbits