Fluoride poisoning is a major health problem that handicaps the ruminant production. The hypothesis put forward by the present study is that the fluoride content of different plant species (cultivated or spontaneous) collected in three south communes of Khouribga known by hydrotelluric fluorosis and in one unscathed commune (Ouled Saaid) affects their forage quality. To verify this hypothesis, samples of aerial plants parts were collected, dried, crushed and sieved. Then the average fluoride

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... tents were determined using a specific electrode. The contents of protein (MAT), neutral detergent fiber (NDF), acid detergent fiber (ADF) and acid detergent lignin (ADL) were also determined. The results showed that the highest fluoride content was recorded in El Fokra (4.96±1.72 ppm) followed by M'fassis (3.79±1.04 ppm), while the lowest levels were found in Ouled Azzouz (2.24±1.77 ppm) and Ouled Saaid (1.92±0.89 ppm). In addition, Fumaria parviflora, Chrysanthemum coronarium, and Hordeum vulgare accumulated the highest levels of fluoride compared to other species. No significant difference between the plants for MAT of the four communes studied was observed. In addition, the species with high fluoride levels showed low levels of NDF (24.25±5.87 %DM), ADF (10.17±6.4 %DM) and ADL (2.32±0.79 %DM). In conclusion, in the non-free areas, fluoride levels at the plant varied by species and by region. In addition, the plants of the communes Ouled Azzouz and Ouled Saaid which have a low level of fluoride present high levels of fibres.