The present study aimed to compare the epithelium tissue of mucosa layer of
gastrointestinal tract in three types of lower vertebrates: Scyliorhinus canicula, Sparus
aurata, Salamandra infraimmaculata. The results of the histological and comparativ
e
study showed that the majority of digestion system parts were lined with simple
epithelium tissue while others were lined by pseudostratified epithelium tissue. Goblet
cells were distributed in all studied parts of digestion systems with density in some
locations. Esophagus was characterized by ciliated epithelium tissue, and the tubular
glands were presents in the stomach mucosa. Concerning the Lumina properia, it was
visible in all digestive system parts with some differences according to the animal species
studied.
The research was carried out on (960) broiler chicks of the hybrid Hibrd in
the Poultry Unite of Kharabo–Agriculture Faculty–Damascus University,
during 27/10/2003 and 23/12/2003.
The chicks were distributed randomly since the first day of age int
o four
experimental groups, every group contained 240 chicks distributed as four
replicates, every replication contained 60 chicks, the area of the replication was
5.5m2 and the density was 11 chicks/m2. Every replication is an independent
sector from byre is open type on deep litter, all conditions of keeping and
caring were the same for all birds of replications.
The purpose of research was to study of effect of using different levels of the
energy and raw protein into mixtures of (pre-starter) since the first day until
sixth day of age on absorption of yolk sac, growth of digestive system ,and some
productive parameters of broiler. 48 chicks were dissected, the chicks were
distributed as 16 chicks in the first day and 16 chicks in the fourth day and 16
chicks in the sixth day of age, from every group 4chicks were evaluated.
