الفهرس 
Material and methodsOnly 14 pages are availabe for public view
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Abstract
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6. SUMMARY AND CONCLUSION
This study was carried out at the Rabbit Research Farm.
Animal Prod. Dept. Faculty of Agriculture, Moshtohor.
Zagazig University.
A total of 144 New Zealand White. California and Giza
White weaning rabbits. 48 each, were used in the present
study. Rabbits of each breed were randomly divided into two
groups according to the level of crud protein (CP) 16% and
18%. Each groups were divided into three groups fed rations
contained different le~els of crude fiber (CF) 10%, 13% and
16%. Rabbits kept under similar and standardbygienicand
environmental conditions.
The slaughter ages were 8 and 12 weeks of age for both
mal~s and females for any breed under any ration. After
salughter process the abdominal cavity was opened and the
digestive system was taken out for morphological and
histological investigations.
Results obtained could be su••erized as follows:
1. Results obtain~d showed clear breed differences in livp
body weight, digestive system weight (full), whole
intestine length, small intestine length. relative
weight of large intestine to body weight.
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2. The advance in rabbits age increased all parameter
investigated except the relative weight of empty
stomach, liver, small and large intestine to body
weight.
3. S~x of animals and parity appeared to be of no effect
in determining the development of the digestive system.
However, in most case ntgligable difference were
observed in favour of females.
4. Our results indicated that increasing of protein level
from 16 to 18% CP improved significantly the live body
weight. liver weight and stomach weight empty, but
other morphological parameters were not significantly
affected by protein level.
5. Rabbits fed on diets containing the low level of fiber
gave the highest body weight, liver weight, digestive
system weight (full) and stomach weight (empty). The
high level of fiber in rabbits diets improved the small
intestine weight, large intestine weight,. relative
weight of small and large intestine to live weight of
rabbit.
6. Rabbits born during winter exceeded those born during
March and April in most measurements. The differences
between 1st and 2nd year of production of rabbits were
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very limeted and not significant in most parameters
except the stomach length (empty) and relative weight
of large intestine to body weight.
7. Concerning the results of histological examination,
rabbits received 18% CP level realized highest values
in the thickness of appendix mucosa and muscularies.
The highest level of fiber (16%) scored the highest
values of thickness of mucosa at 8 and 12 week of age
also the thickness of muscularis at 8 weeks.
Generally, measurements of histological examination
were in harmony with those of morphological investigation.
8. The correlation between all traits Showed that there
are high and significant
liver weight.
except live body weight and