A total of 104 apparently healthy day old broiler chicks of both sexes purchased from ECWA Livestock Production Farm, Jos, Plateau state of Nigeria were used for the research. They were housed in a newly constructed poultry house and were given clean water and commercially prepared feeds (Grand Feeds and Oil Mills, Ibadan, Nigeria) ad libitum. The birds were brooded for 3 weeks and allowed to adjust for another 1 week before the commencement of the experiment. All the required vaccinations were done.