IGEVET   21075
INSTITUTO DE GENETICA VETERINARIA "ING. FERNANDO NOEL DULOUT"
Unidad Ejecutora - UE
artículos
Título:
Selección por tamaño de camada en conejos para carne
Autor/es:
ANTONINI, A.G., CORVA, S.G., OYARZABAL, M.I.
Revista:
Basic and Applied Genetics
Editorial:
Sociedad Argentina de Genética
Referencias:
Lugar: Buenos Aires; Año: 2008 vol. 19
ISSN:
1666-0390
Resumen:
In rabbits, most of selection programs are mainly focused on prolificacy and indirectly, with low pressure, on fertility,
thus rejecting sterile females. The aim of this work was to evaluate selection response to weaning litter size (tcd) on meat
rabbits during seven generations and to estimate heritabilities and genetic correlations with total birth litter size (tct) and alive
birth litter size (tcv). Records for litter size, fertility and survival (on 390 does with two or more pregnancies mated with 63
males) were analyzed. Selection differentials, selection responses, genetic correlations and heritabilities were calculated. The
selection differentials were positive in all the generations, nevertheless, the observed selection responses oscillated between
positive and negative values not allowing to establish a tendency in none of the studied characters (regression coefficients
of each character on generations: btct=-0.02, btcv=-0.03, btcd=-0.27; p>0.05). Despite the fact that the selection was based on
litter size, there were no increases on selected character and its correlated characters (tct and tcv). Natural selection was not
the reason of this absence of response. Heritability low values indicated that phenotypic variability is due to non additive
effects, environmental effects or their interactions and could explain these results.
litter size, there were no increases on selected character and its correlated characters (tct and tcv). Natural selection was not
the reason of this absence of response. Heritability low values indicated that phenotypic variability is due to non additive
effects, environmental effects or their interactions and could explain these results.
litter size, there were no increases on selected character and its correlated characters (tct and tcv). Natural selection was not
the reason of this absence of response. Heritability low values indicated that phenotypic variability is due to non additive
effects, environmental effects or their interactions and could explain these results.
tct=-0.02, btcv=-0.03, btcd=-0.27; p>0.05). Despite the fact that the selection was based on
litter size, there were no increases on selected character and its correlated characters (tct and tcv). Natural selection was not
the reason of this absence of response. Heritability low values indicated that phenotypic variability is due to non additive
effects, environmental effects or their interactions and could explain these results.