الفهرس 
Cover Page Title in EnglishOnly 14 pages are availabe for public view
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Abstract
Probiotics is Considered one of the most important feed additives of poultry ; it is a potent immunostimulant , composed of living micro-organisms have many health benefits and here in this study proved to modulate the immune response in poultry by several ways
One hundred (1 day old ) Hubbard broiler chicks were alloted to 5 groups . Each group consists of 20 chick
The fk group ‘I’ were Avi-Bac fed (500 g I ton of starter feed )
The second group ‘2’ were Bioplus 2B fed ( I000g / ton of starter feed) . The thjt:d group ‘3’ were Biovet-YC fed (500 g / ton of feed)
The fourth group ‘4’ was feeding on ordinary starter ration , this group represents control positive.
The fifth group ‘5’ represents control negative chicks that were neither vaccinated nor fed with probiotic
The first 4 groups were vaccinated with a vaccination program and reared for days. The following parameters are used to evaluate the effect of probiotics as an immunostimulant:
1. Measuring the humeral immune response of chicken
a- To NDV and AIV by HI test
b- To IBDV by ELISA test.
c- Probiotic effect on B- cell function / production of antibodies by Heam-agglutination Inhibition Test (HI) with 2-Mercaptoethanol (2-ME) treated sera.
2. Measuring of the cell - mediated immune response by:
a- Lymphocyte Transformation test.
b- Determination of the phagocytic activity of chicken peripheral blood
monocytes (PBM) using C. albicans.
3. studying the effect of probiotic on the weight of chicken bursa.