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Abstract
The aim of this thesis was to study the effect of probiotics, prebiotics and their combination on the productive and health parameters in chickens.
Two hundred-one day old balady chicks were allotted in to five groups, up to 7 weeksof age.
01: chicks were not fed with probiotic nor fed with prebiotic
represent control non treated group.
02: chicks were fed on prebiotic (Aiphamune).
G3: chicks were fed on probiotic 1 (Nutro-tox).
04: chicks were fed on probiotic 2(Veta-diacure).
G5: chicks were fed on a mixture of probiotic 1 and prebiotic (a mixture of Nutro-tox + Aiphainune).
All groups were experimentally infected orally with S.Enteritedis at age of 30 daysto test the effect of different treatments on the rate of S.Enteritedis re-isolation from different organs.
The main results can be summarized as following:
1.There was a significant increase in the relative weight in intestine 4.977% for a mixture of probiotics 1+prebiotic, 4.209% for probiotic 2, 4.13 1% for probiotic 1, 4.059% for prebiotic and 3.569% for control non treated group.
For liver 3.45 7% for a mixture of probiotics 1+prebiotic, 3.2% for probiotic 1, 3.1111% for probiotic2, 3.073% for prebiotic and 2.86 1% for control non treated group.
For bursa 0.75 1% for a mixture of probiotics l+prebiotic, 0.714% for probiotic 2, 0.686% for probiotici, 0.664% for prebiotic and 0.602% for control non treated group. For spleen 0.371% for a mixture of probiotics 1+prebiotic, 0.338% for probiotic 2, 0.323% for probiotici, 0.247% for prebiotic and 0.220% for control non treated group. For thymus 0.682% for a mixture of probiotics l+prebiotic, 0.628 % for probiotic 2, 0.615% for probiotici, 0.498% for prebiotic and 0.45 1% for control non treated group.
2.HI titers for NDV were log 25.25 for a mixture of probiotics l+prebiotic, log 25 for probiotic 1, log 24.25 for probiotic2, log 23.5 for prebiotic and log 22.75 for control non treated group.
HI titers for AIV were log 25.75 for a mixture of probiotics 1+prebiotic, log 25.5 for probiotic 1, log 25 for probiotic2, log 2 3.25 for prebiotic and log 22.75 for control non treated group.
3. All treatments cause scanty growth on 10th day P1, while infected non treated group cause scanty growth on 31h P1. Luxuriant growth was obtained in the 15th days PT infected treated group, while in infected non treated group occur in 10th days PT.
4. All treatments cause retardation of re-isolation of S.Enteritedis from the infected bird’s internal organs (liver, gall bladder, spleen, heart blood and cecum) till 10th days post infection. S.Enteritedis not recovered from gall bladder and spleen of the birds feed on probiotic 1 +prebiotic at 15th days P1, however, S.Enteritedis re-isolation from spleen of birds fed on probiotic 1 at 15th days PT. While S.Enteritedis was recovered from ceca of group 2 (birds fed on prebiotic) at 5th days P1.