Formulations of feeds for livestock are developing rapidly through the innovation and improvement of raw materials, additives, preparation process, as well as production technologies. This is also evident from the elevation in the number of patent applications filed each year worldwide in this area of livestock feeds research and development. Among, these novel formulations, the seaweeds could be used either as directly feeding supplement for livestock, or as additive for livestock feed. Rich in proteins and minerals, seaweeds can contribute and may help to enhance energy requirements of livestock, as well as livestock production and health. For example, a method of obtaining beef of increased shelf-life comprises the step of grazing cattle on forage into which seaweed supplement is incorporated during the feedlot finishing period. This work, in the form of patent analysis, describes the state of the art by introducing what has been patented in relation to seaweed-containing feeds for livestock. Furthermore, a detailed analysis of the patentability of seaweed-containing feeds for livestock, their preparation methods and their formulations, is provided by determining publication years, patent classifications, inventors, applicants, owners, and jurisdictions. The patent classification codes reveal that most inventions intended for animal feeding-stuffs obtained by fermentation of natural products, such as vegetable material and biomass. Knowledge clusters and expert driving factors indicate that the research based on pre-treatment of feeding-stuffs with enzymes is concentrated in the most patents.