author(s)
Anju Sati, BC Mondal, Ashoka Kumar and Anil Kumar

abstract
A feeding trial was conducted to discern the effect of dietary incorporation of soybean oil and guava leaf powder on performance, nutrient utilization, carcass traits, haemato-biochemical parameters of broiler chickens. The result showed the significant increase in weight gain of broiler chickens fed combination of guava leaf powder and soybean oil than the other groups. Final body weight was maximum in the treatment group fed 1% guava leaf powder and 3% soybean oil (1825.65 g) followed by treatment group fed 1% guava leaf powder (1801.70 g), treatment group fed 3% soybean oil (1780.82 g) and 1760.30 g in control group. Incorporation of soybean oil and guava leaf powder did not affect nutrient utilization and caused a significant decrease (P≤0.05) in ether extract content of breast and thigh muscles. There was significant increase (P≤0.05) in the haemoglobin, packed cell volume, total protein and globulin content in the broiler chickens fed guava leaf powder as supplement. Significant decrease (P≤0.05) in serum cholesterol, triglycerides, blood glucose and liver enzymes in the broilers fed guava leaf powder as compared to other groups. The results of present study suggest that guava leaf powder supplementation alone or with soybean oil in the basal diet has beneficial effects in the broilers as it increases growth rate, serum total protein and globulin content whereas it reduces serum cholesterol, triglycerides, glucose and liver enzymes such as SGOT and SGPT.