The aim of this study was to assess biomass production in grazing lands used by cattle (under and outside palm groves), as well as the quality of fodder species grazed. Four herds were monitored during grazing, enabling to identify the animals’ preferred grazing areas. A GPS (GARMIN 64s) was used to determine the animals’ grazing routes. In addition, grazing monitoring carried out with farmers in enabled to identify the species consumed by the animals. The chemical composition of these most palatable resources was assessed through the contents of Dry Matter, Organic Matter, Ash, Protein, Fiber and Fat (Ethereal Extract). Results showed that pasture productivity was 1198.43 ± 743.63 t.DM/ha (in Ouemey Valley district) and 768.69 ± 135.03 t.DM/ha (Pobe district) under palm groves, and it was 1264.43 ± 700.88 t. MS/ha (Ouemey Valley) and 702.69 ± 38.24 t.MS/ha (Pobè) outside the palm grove. For grazing, the herds covered approximately 1.65 ± 0.70 km (Pobe district) and 1.90 ± 0.50 km (Ouemey Valley) under palm groves, while the grazing length was higer in pastures outside palm groves; 7.86 ± 1.07 km (in Pobe) and 6.27 ± 0.97 km (Oueme Valley) outside palm groves. Grasses in addition to Legumes like Mallotus oppositifolius and Tridax procumbens were the most consumed species. These species showed protein contents higher than 8 %DM, demonstrating their quality as feed for cattle. This study clearly shows availability of pasture of good quality in sub-humid zones and their suitability for feeding Lagune cattle.