Two experiments of divergent selection for uterine efficiency in rabbits were performed. Rabbit does were unilaterally ovariectomized and a laparoscopy was made at mid-gestation to observe the number of corpora lutea and implanted embryos in the functional genital tract. Selection was based on the number of fetuses which died between implantation and birth in the first experiment, and on litter size in the second one, both using BLUP on an animal model. This paper presents the average values of observed traits and their heritability. Results show that an effective overcrowding of one uterine hom was obtained at implantation. The additive genetic variability of embryonic survival seems to be greater than that of fetal survival. Some differences in heritabilities between intact and unilaterally ovariectomized females tend to appear.

G. Bolet, M. A Santacreu, M. J Argente, A. Climent, Agustin Blasco

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 19. Selection and quantitative genetics; growth; reproduction; lactation; fish; fiber; meat., , 261–264, 1994
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