One of the most significant environmental factors affecting Drosophila growth and development is nutrition. Quantity and quality of nutrients in the food has a significant impact on the growth development, reproduction, health, and survival of the organism. Jeeni millet is a nutricerals which has the mixture of nine different millet and small amount cerals. It is rich in carbohydrates and protein contents and has high calorific value. In the present study we demonstrates the effect of jeeni millet on the reproductive fitness such as mating latency, copulation duration, fertility and thorax body size in the Drosophila melanogaster The D.melanogaster flies were obtained from different cultured media such as wheat cream agar media, Jeeni Millet media and Mixed media (Millet and wheat cream agar media in equal proportions). These flies were used to study it’s effects on the reproductive fitness i.e., mating latency, Copulation duration and fertility in D. melanogaster in pairwise mating experiment. The experimental results signifies that the flies fed with Jenni millet diet had taken shortest time for mating while flies fed with wheat cream agar diet took longer duration to initiate the mating and mixed diet flies had taken the intermediate time for mating latency.

Copulation duration studies also showed that the flies fed with mixed diet copulated significantly longer time compared to jeeni millet diet and wheat cream agar diet. The Jeeni millet fed flies copulated in shortest time where as flies raised in wheat cream agar media had taken intermediate time for copulation.The Copulation duration times indicates the male transfer the greater quantity of sperm to the female.

 The study of the fertility, also revealed that significant varition in fertility was noticed between the wheat cream and other treated media. The progeny production was least in the flies fed with the jeeni miilet and highest progeny production was observed in flies fed with the wheat cream agar media.where as average progeny production was noticed in the mixed media.

The study of Thorax size showed that significant variation between flies fed with the wheat cream agar and other treated media. The thorax size is larger in the flies fed with the wheatcream agar media and average is observed in the mixed media as well as jeeni millet fed flies had the smaller size.