**3.1 Probiotics**

Probiotics have being used to reduce poultry enteric diseases [5]. Probiotics are live microbial feed supplements used to balance microbial population in the intestine through the production of compounds that displace pathogens from enterocytes and maintaining the pH in the gut of animals. Some of the microorganisms used as probiotics are *Lactobacillus acidophilus, Streptococcus faecium, Bacillus coagulans, Bifidobacterium bifidum, Saccharomyces cerevisiae, Enterococcus faecium, Aspergillus oryzae* etc. [5]. Some of the advantages of the use of probiotics as antibiotics alternative are they inhibit the growth of diseases producing organisms. They also prevent digestive upsets and diarrhea due to bacterial invasion. Probiotics improve intestinal ecology and harmonize functions of the digestive system etc. [9] in their work while evaluating the dynamics of probiotics on immune response of broilers reported significantly higher antibody production (*P* < 0.01) in experimental birds fed probiotics as compared control ones.
