الفهرس 
Title : Impact of certain feed additives on health, immunological state and productive performance of broiler chickens
AbstractOnly 14 pages are availabe for public view
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Abstract
Two delivery routes of phytobiotic (Digestrom-PEP®) and synbiotic (Poultrystar®) via drinking water or feed were examined to study their effects on broiler chickens health and performance. Five dietary treatments of 3 replicates each were allocated using 750 one-day-old Cobb broiler chicks of both sexes (50 chicks/replicate). The first group consumed water and basal broiler diets without any additive and served as a control group (G-A). Broiler chicks in the second and third groups (G-B and G-C) consumed basal broiler diets without additive and were received drinking water supplemented with Poultry-star® and Digestrom-PEP® respectively. Broiler chicks in the fourth and fifth groups (G-D and G-E) were received drinking water without supplement and reared on the basal diets containing Poultry-star® and Digestrom-PEP® respectively. Poultry-star® and Digestrom-PEP® were used either in drinking water or in the feeds according to the manufacturer recommendations doses. Feed and water were provided ad-libitum during 35 days experimental period. Body weights as well as the rest of feed were recorded weekly. Body weight gain and feed conversion were calculated. Blood samples were collected according to a time program to evaluate some health and immunological parameters. At day 16 of age 15 birds from each group (5 birds/replicate) were isolated and challenged orally with 1 ml containing Clostridium perferingens(107cfu/ml) daily for 3 consecutive days. Post-challenge, lesion scores, mortalities and intestinal Clostridium perferingenslevels were assessed. Tissue samples from duodenum, jejunum, ileum, cecum, bursa and thymus were collected for histopathological examination. At the end of the experiment, fifteen birds were randomly selected from each group (5 birds/replicate) to evaluate carcass characteristics