[EN] Litter
si
ze is one of the traits
with greater econo
mic weight in rabbit production
. The objective
of thi
s work is to study the extent and distribution of mortality from birth to weaning
and ...[+]
[EN] Litter
si
ze is one of the traits
with greater econo
mic weight in rabbit production
. The objective
of thi
s work is to study the extent and distribution of mortality from birth to weaning
and
to
propose a new selection crit
erion to improve litter size
.
A total of 1318 data of seven rabbit lines
were ta
ken from UPV farms. Litter size and number of dead young
rabbits f
rom birth until
weaning
were recorded. Sixty eight per cent
of the mortality occurred in the first week and that
most of the mortality until weaning had already occurred at the end
of the second week post
-
partum
,
86
%.
Lines showed significant dif
ferences
for mortality
. The R line,
a
paternal line
selected for growth rate
,
had
a higher mortality during
the studied
period. Differences
for
mortality
between
R line and maternal lines
(V, A and B) were
relevant. Paternal line (R) also
showed
a low litt
er size at weaning. Maternal lines
had
the highest values
for litter size at
weaning
.
In view of the results it was decided to propose as a new criterion for selecting the
number of l
ive rabbits 8 days post
-
partum.
Before starting a
selection program, it
should collect
more data
and estimate the heritabil
ity and the expected response for this new selection
criterion
.
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[ES] Se va a estudiar la mortalidad desde el momento del parto hasta el destete en seis líneas de conejos que se seleccionan para caracteres diferentes. En un trabajo preliminar, se observó que la mayor parte de la mortalidad ...[+]
[ES] Se va a estudiar la mortalidad desde el momento del parto hasta el destete en seis líneas de conejos que se seleccionan para caracteres diferentes. En un trabajo preliminar, se observó que la mayor parte de la mortalidad se presentaba durante los primeros quince días, el número de datos no era suficiente para estudiar si había diferencias en el patrón de mortalidad a lo largo del tiempo entre líneas. El objetivo de este trabajo es tomar más datos de todas las líneas y estudiar si hay diferencias entre las líneas en la cantidad y la distribución de la mortalidad desde el parto hasta el destete.y muertos al parto.
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