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A total of day-old straight run Arbor Acre broiler chicks were fed diets without or with growth promoters such as, flavomycin, surmax (avilamycin), genex and availa-Z/M at mg, mg, g and g per kg respectively, up to days of age to evaluate the e cacy of di erent growth promoters and recommend a suitable growth promoter in broiler diet. The results indicated that live weight and feed conversion ratio di ered significantly (.), and it was observed that surmax group was the best performer among the dietary groups. The study also reveals that antibiotic groups (flavomycin and surmax) were better in terms of growth and meat yield compared to the non-antibiotic groups (genex and availa-Z/M). Livability was apparently higher in surmax group () compared to other groups. Profitability ($/kg broiler) was found .

An experiment was carried out with laying pullets to investigate the effects of feeding neem (Azadirachta indica) leaf meal (NLM) at different dietary concentrations on cholesterol metabolism and productivity of laying chickens. Forty, 26-week old laying pullets belonging to Shaver 579 strain was fed NLM for 12 weeks. Five dietary treatments, each of four replications, containing either 0, 5, 10, 15 or 20g NLM per kg were compared. The birds were reared in a pyramid-type laying cage. Blood and eggs were collected three times maintaining four weeks interval for the determination of cholesterol concentration respectively in serum and egg yolk. Eggs from birds laid after 6 weeks of feeding NLM were used for the determination of internal and external characteristics of eggs. Body weight gain, egg weight, total egg mass, FCR, survivability, and internal and external egg quality characteristics were studied. Use of NLM at 10 and 15 g/kg showed negative quadratic effect (P<0.01) on total lipids and yolk cholesterol after 4 weeks and 8 weeks of supplementation. Similar result was obtained for serum cholesterol (P<0.05) after 8 weeks of supplementation. Analysis of performance data showed no significant difference from control group except a linear decrease in feed consumption (P<0.01). A linear increase (P<0.05) in albumen index and a positive quadratic effect (P<0.01) on Haugh unit were also found. Based on the result, it may be concluded that NLM could be considered as a hypocholesterolemic dietary feed additive with dietary inclusion levels between 10 and 15 g/kg.

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