Omar Kata Faye (31), postgraduate student at the University of Ziguinchor Assane Seck, visits regularly Samba Deme, a local shepherd from Ziguinchor,
to negotiate the price of the cowpat that he will purchase for his research on biogas. Omar is undertaking a Masters in Renewable Energies and he is
doing a research on the production of biogas made from organic wastes, such as cowpat and cashew apples. Samba Deme sells a 50Kg bag of cow
dung for 500 CFA (0,76€).