In dairy production systems, efficient pasture management is crucial for maximizing milk output while minimizing costs. However, many producers make decisions without considering the productive efficiency of different forage types. This research aims to address this gap by comparing the milk production and related expenses of Brown Swiss and Jersey cows fed with three types of grass: Maralfalfa (Pennisetum sp.), Cameroon (Pennisetum purpureum), and Mulato (CIAT 36087).The milk production and related expenses for generating one liter of milk from Brown Swiss and Jersey cows were compared when fed with Maralfalfa (Pennisetum sp.), Cameroon (Pennisetum purpureum), and Mulato (CIAT 36087) grasses. Productive and reproductive parameters affecting milk production were analyzed. Milk production of the cows under study was measured for one month when they were exclusively pasture–fed with Mulato grass. The group of 33 cows was randomly subdivided into three subgroups, each consisting of 11 cows, and each subgroup was assigned to consume a specific type of grass. This resulted in the Maralfalfa consumption group (SG1), the Cameroun consumption group (SG2), and the control group with Mulato pasture feeding (SG3). Daily milk production was recorded for six weeks, with standardized management and ad libitum feeding. Daily milk production for each cow was monitored and recorded over the six–week period. Highly significant differences (P<0.01) were observed among the three studied groups from the second week onward. The main difference was observed between SG1 and SG3. The highest productivity, with greater milk production volumes, was observed in cows consuming Maralfalfa. However, variables such as the service period, live weight, and number of calving performed better with Cameroon grass. Cost–benefit analysis favored the use of Mulato grass.