Present experiment was conducted to study the influence of varying level of energy with constant level of protein on the performance of male and female broiler chicks. For this purpose 90 males and 90 females were reared in batteries for 50 days. Each group was subdivided into three sub groups, and starter ration A, B and C were given to each sub group for first 28 days, and from 29 to 50th days finisher rations A1 B1 and C1 were given. Starter rations A,B and C contained 23% protein and 3050, 3150 and 3250 Kcal / kg of M.E respectively. The finisher rations Aj B1 and Cj contained 20% protein and 3050, 3150 and 3250 Kcal / Kg of M.E. On starter rations A, B and C males gained 857.94, 867.4 and 868.74 gms respectively. Where as females gained 806.9, 820.1 and 826.8 gms respectively. This difference in weight gain was non significant. Feed consumption by the male chicks was 1449, 1460, and 1440 grams respectively, where as females consumed 1403.0, 1409.6 and 1413.6 grams respectively. This difference was also non significant. Similarly a non significant difference was obtained for feed conversion ratio during this period on different raions.

On finisher raions A1 B1 and C1 males gained 751.2, 882.0 and 968.5 grams respectively where as females gained 589.5, 639.0 and 655.5 grams respectively. For the males the difference was highly significant (P <0.01) and for females it was non significant (Tablei 1). Feed consumption by male broiler chicks was 2091, 2196.7 and 2270.7 grams respectively. Where as for females it was 1978, 1989 and 2025 grams respectively. The difference was non significant for both males and females. During this peroid feed conversion ratio for males was 2.78, 2.49 and 2.35 respectively. Where as for females it was 3.36, 3.11 and 3.09 respectively. The difference was non significant for females where as difference for the males was significant (P
It was concluded that the males can convert higher levels of energy more efficiently than females. It was also observed that increasing energy resulted in increased abdominal fat but the difference was non significant. The results also revealed that on rations A, B and C the males were 15.23, 19.89 and 23.94% respectively heavier than the females. It was also observed that on corresponding rations males consumed 4.7%, 7.6% and 7.9% more feed than the females. Similarly it was also observed that on rations A, B and C males had a better F.C.R of 10%, 11.48% and 14.85% than the females on corresponding rations.

Economical analysis revealed that it was feasible to increase M.E for the males to 3150 Kcal / kg. But the best results for females were obtained at M.E 3050 Kcal / Kg. It was also noticed that on ration A, B and C the males produced meat at a cost of 1.97, 2.33 and 2.92 Rupees / Kg less then the females.