A total of 114 females from generation 1 (Gl) and 2 (G2) of a divergent selection experiment on uterine efficiency (UE+ and UE- lines) were used. All females were slaughtered in the 5th gestation, Gl females (49) at 18 days after mating and G2 females (65) at 25 days of gestation. Number of corpora lutea (CL), total number of fetuses (TF), live number of fetuses (LF), number of implantation sites (IE), fetal survival (FS=LF/IE), prenatal survival (PS=LF/CL), individual fetus weight (FW), individual fetal placenta weight (FPW) and maternal placentae weight (MPW) were studied. The functional uterine hom was weighed full (FUW) and empty (EUW) at 25 days of gestation. Length of full uterine hom (FUL) and empty uterine hom (EUL) were also recorded at the same time. No differences in fetal survival were found between UE+ and UE- either at 18 or 25 days of gestation. UE+ had heavier live fetuses, but these advantages are lost at 25 days, and UE- fetuses weight more. However, fetal placentae seems to be more developed in line UE+ either at 18 and 25 days of gestation. The higher weight of placenta and dead fetus at 25 days in EU+ suggest an earlier death in EU-. No differences between lines were found in uterus length and weight.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 19. Selection and quantitative genetics; growth; reproduction; lactation; fish; fiber; meat., , 230–233, 1994
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