This study aims to evaluate the body weight and carcass traits of Vanaraja poultry and its crosses with local Desi birds in the different agro-climatic conditions of Bihar, India. The research problem is the lack of information on the performance of Vanaraja and its crosses in this specific region. The study was conducted at the Instructional Livestock Farm Complex in Bihar Veterinary College, Patna. Vanaraja and its crosses with Desi fowl from different regions of Bihar were used as genetic groups. Body weight at different ages and various carcass traits were measured. The data were analyzed using a mixed model least-squares and maximum likelihood computer-based program. The results showed that Vanaraja and its crosses had significantly higher body weight and better carcass traits compared to the local Desi birds. The study concludes that the crosses exhibited heterotic effects and were superior to the Desi birds for these traits. However, the Vanaraja breed itself remained superior to the crosses. The findings have implications for promoting poultry production and improving income and nutrition in Bihar.