Objective: To determine the prolificacy and weight of lambs at birth (BW) in twogenotypes hair sheep within an agropastoral system on coast Oaxaca, Mexico,and to evaluate effect two sources selenium performance fromsaid during fattening phase.Design/Methodology/Approach: The study was carried out system(coconut palm Cynodon dactylon grass) Río Grande, Oaxaca. Two experimentswere conducted; firs...