[EN] The influence was studied of different heat
loads connected with the application of sorne antibiotics and
probiotics on growth and reproductiva traits of 105 growing
and 70 doe New Zealand White rabbits. The augmentation in
environmental temperaturas increased the respiration rate
and rectal temperatura significantly, while it significantly
decreased daily body gain (24 %) and daily concentrate
intake (18 %) in growing rabbits. Similarly,in does, litter size
at birth and at weaning, viability percentage, young individual
weight at birth and at weaning and gain from birth to weaning
decreased significantly by 17, 31, 16, 27, 19 and 18%
respectively. During summer, application of antibiotics: Avoparcin (AV), Flavomycin (FL) or Zinc...
[EN] The influence of feeding intensity on the
chemical composition of skinned whole carcasses and on fur
quality was examinad in 2 groups of Castor Rex rabbits, fed
ad libitum (n = 8 ¿ and 8 <¡>¡ and 75 % of ad libitum (n = 8 ¿
and 8 ), respectively. The rabbits were born in June and
pelted in December at 179 days of age. Feeding intensity
strongly affected body weight at pelting (P<0.001). fat co. ntent
[EN] The exact origins of rabbit domestication in China are still not
very well known, and different hypotheses regarding them
have been formulated. Globally, the Chinese rabbit
production is mainly angora wool production orientad. This
represents a value 2,5 times higher than meat and an
important part of the meat comes from young angora rabbits.
Nevertheless, a high number of meat proauct1on orientad
rabbit farms exist in China. From a geographic point of view,
the rabbit is developed mainly in Sichuan and near the coast.
Globally, more than 90 % of the rabbit production comes
from little farms with only few does even if sorne big rabbits farms also exist....
KHALIL, M.H.; AFIFI, E.A.; YOUSSEF, Y.M.K.; KHADR, A.F.
[EN] A crossbreedin~ experiment was carried out in
Egypt involving a local breed Baladi Red, BR) and an exotic
one (New Zealand White, N ) to estimate direct heterosis,
maternal additive effects and direct additive effects on sorne
litter traits and reproductive intervals in doe rabbits. Litter
traits included litter size and weight and mean young weight
(at birth, 21 days and at weaning), number born alive and
preweaning litter gain and mortalitv, while reproductive
mtervals included days open (intervaí from kindling to next
conception) and kindling interval (period between two
consecutive parturitions). Data were analysed using a linear
mixed model. Winter kindlings recorded the largest litter size
and the heaviest weight...
AYYAT, M.S.; MARAI, I.F.M.; EL-SAYIAD, GH.A.
[EN] To study the genetic and non genetic factors
affecting doe milk production and preweaning litter
performance, 519 litters of New Zealand White raboit were
used. Sire significantly (P<0.05) affected milk yield of the first
week only, while doe afl'ected siQnificantly (P<0.01) milk yield
of most of the experimental penods except the fourth week
which was insignificantly affected. Milk yield was the highest
in the second parity. Season of kindling affected significantly
(P<0.01) milk yield in most of the weeks of the study, except
the fourth which was insignificantly affected and showed the
lowest yield at summer. Litter size at birth affected
significantly (P<0.01) milk yield which increased by the
Chiericato, G.M.; Boiti, C.; Canali, C.; Rizzi, C.; Ravarotto, L.
[EN] The effect of environmental temperature and
age on plasma hormonal concentrations of testosterone (Tl,
dihydrotestosterone (DHT}, cortisol (C), triiodothyronine (T3)
and thyroxine (T4) were evaluated in 40 male Grimaud
rabbits. Twenty animals were reared at 20ºC (TNT = Thermic
Neutrality Temperature) and the other 20 at 27ºC (HST =
Heat Stress Temperature). Far both treatments relative
humidity levels averaged 77 % and the photoperiod was
8D:16L with a light intensity of about 40 lux. The animals
were fed ad libitum with a commercial pelleted feed. Blood
samples were collected from each ammal by intracardiac
puncture at 71 and 85 days of age. No interaction effect
between temperature and age was found....
AYYAT, M.S.; MARAI, I.F.M.; ALAZAB, A.M.
[EN] One hundred and twenty male New Zealand
White (NZW) rabbits of 35 days of age were randomly
allotted to twelve groups. Rabbits of six groups were fed a
low protein diet (f6.44 % crude protein) and the other six
were fed a high protein diet (18.5 % crude protein). Within
each dietary protein level, three groups were supplemented
with copper sulfate to supply e1ther O, 100 or 200 ppm
copper/kg diet, while the other three were supplemented with
copper cflloride to supply the same levels of copper. Most of
the studied traits were affected positively with the increase in
each of protein and copper levels in the diets of...