author(s)
Sokhna Toure, Boubacar Cissokho, Toffène Diome and Mbacke Sembene

abstract
The use of maggots in poultry feed makes it possible to better overcome the problems faced by poultry farmers. Although the production cost of the latter is not substantial, it is essential to control the production parameters. This study, performed in Senegal, more precisely in the commune of Gossas, aimed to evaluate the productivity of locally available substrates. To do this, four substrates were used, namely cattle leaning, mango, sheep liver and fish viscera. As for the size, 10 maggots were taken per production to make the measurements. Regarding the duration of larva development, it was the difference between the hatching of the eggs and the onset of pupal. The results obtained reveal that the leaning substrate is more productive with an average of 900.9 larvae, followed by mango with an average of 447.6 larvae, followed by viscera with an average of 235.5 larvae and finally the liver with 159.8 larvae. Regarding the larval duration, it was slower for the viscera and mango with values of 5.7 days and 5.4 days respectively, and faster for the leaning and the liver with values of 3.6 days and 4.6 days respectively. Concerning the fly family, three were present; the Muscidae largely followed by the Calliphoridae and the Sarcophagidae in last place. The measurement of the larval size of these families reveals that they are more important at the viscera level as far as the Muscidae are concerned, with an average value of 1.26cm (±0.051). On the other hand, in the Calliphoridae, the average value is more consistent in the liver, with 1.22cm (±0.042) as the. The Sarcophagidae are only found in the viscera.