RESUMEN: La alcalosis ruminal se define como una indigestión toxica, causada por un exceso de proteína del sector anterior del bovino, exceso que va unido a una reducción en el aporte de carbohidratos (CHOS) altamente fermentables y a la concentración de los ácidos grasos volátiles (AGV). En la mayoría de los casos la gran cantidad de proteína en la dieta proviene de la utilización de abonos químicos ricos en nitrógeno (N₂​), como la urea, que al metabolizarse en el rumen origina grandes cantidades de amoniaco (NH₃).ABSTRACT: When food too rich in protein is fed to bovines an alkaline toxic indigestion is produced. The same occurs after the consumption of pasture fertilized with low organic of organic nonprotein nitrogen and besides with low soluble carbohydrate consumption, whose energy is necessary for the bacterias to produce bacterial protein. When there is not enough energy, the nitrogen compounds are metabolized to give high ammonia (NH3+) concentration. Consumption of very mature or very young and lushy pasture gives rise to problems in the ruminal flora. After bacterial death brings soluble protein passed to the ruminal liquid, being this another way to generate digestive alkalosis. The ruminal alkalosis can also stimulate others digestive pathologies such as foamy or not gaseous bloat, simple indigestion and ruminal acidosis. That is why the symptoms are shared with those enatities, but can generate dangerous sequels that affect the hapato renal system, giving origin diseases like mastitis, hypocalsemia, hypomagcemia, hypoglicemia, laminitis, reproductive disturbances and others.COL0009556