Four experiments were carried out to evaluate the effect of Garlic supplementation in broiler chickens. In the first experiments 0-4 weeks, a total of 270 day old broiler chicks were used for the experiment which had six treatments and three replicates, each replicate was allotted 15 birds in a completely randomized design. Six broiler starter diets were formulated such that (Diet 1) contains 0.01% of an antibiotic, Neocloxsin. For Diets 2, 3, 4, 5 and 6, Garlic meal was included at 1.00, 1.50, 2.00, 2.50 and 3.00% in the Diets respectively. In the 2ndExperiment 5-9 weeks, 180 birds from experiment 1 were used. The experiment had six Diets and three replicates each; each replicate was allotted 12 birds in a completely randomized design. Six broiler finisher Diets were formulated, they contained the same level of antibiotics and Garlic meal as in experiment 1. There was significant (P < 0.05) difference in the finial body weight, weight gain, feed intake, feed to gain ratio, feed cost per kg gain and mortality across dietary treatments. At the end of the starter and finisher phase of the experiment, 1.5% dietary level of garlic meal supplementation had a better feed conversion ratio and better live weight while the least was obtained on birds fed 3.0 % garlic inclusion.

 There is increasing pressure to reduce or eliminate the use of antibiotics in poultry feed due to the claimed negative effects on human health arising from antibiotic resistance. In the United States, poultry producers are faced with a national regulation that prohibits the use of antibiotics (USDA, 2005). This has left poultry producers looking for alternatives to antibiotics that are relatively cheaper and with minimal residual effect. Use of antibiotic that might result in deposition of residues in meat, milk and eggs must not be permitted in food intended for human consumption. If use of antibiotics is necessary as in prevention and treatment of animal diseases, a withholding period must be observed until the residues are negligible or no longer detected.