AbstractProfit from cattle production is based on feed consumption and its utilization efficiency by animals. Beef cattle production is particularly suited to the grazing system because it requires fewer nutrients than dairy cattle. However, knowledge of the match between food supply and nutritional needs of cattle on pasture is complex because cattle collect a diversity of foods. The study of feed consumption and the factors that influence it is important to ensure maximum consumption of cattle. As grasses and legumes are the main foods in the grazing system, their fiber and cell wall content definitely affects the animal's digestion, resulting in variation in the amount of feed consumed. Supplementation with concentrate feeds can limit feed intake because high starch levels can affect microbial activity in the rumen. Conversely, feed intake of grazing cattle can be improved if the best amount of supplementation is given. Furthermore, the physical and physiological factors of the animal also play an important role in determining the feed consumption of cattle, for example the difference in feed consumption between fat and lean cattle, pregnant and non-pregnant cows or lactating and non-breastfeeding. Finally, the most critical factor that affects feed intake for grazing beef cattle are environmental characteristics that are characteristic of grazing, temperature, and parasitic diseases. These factors partially and totally influence the other two factors above.1. IntroductionThe supply of animal feed is the main input for livestock production. Animal feed utilization depends on feed intake and efficiency. According to Forbes (2007), food consumption refers to the amount of food that an animal or group of animals can eat freely during a specific period of time. The contribution is imp......middle of paper......les, et al. (2008). “Environmental factors affecting feed consumption of oxen in different housing systems in summer.” International Journal of Biometeorology 52(6): 419. Leng, R. (1990). “Factors affecting the utilization of “poor quality” forages by ruminants, particularly under tropical conditions.” Nutrition Research Reviews 3(01): 277-303. McDonald, P., R. Edwards, et al. (2002). Animal feed. United Kingdom, Pearson, Prentice Hall. Phillips, C.J.C. (2010). Principles of beef production. Oxfordshire, CABI. Seré, C., H. Steinfeld et al. (1995). “Global livestock production systems: current status, issues and trends.” Van Soest, P., D. Mertens, et al. (1978). “Pre-harvest factors influencing the quality of preserved fodder.” Journal of Animal Science 47(3): 712. Young, B. (1981). “Cold stress as it affects animal production.” Journal of Animal Sciences 52(1): 154.