This paper presents the efficiency of organic acids (sorbic acid, benzoic acid and palm and coconut oil acids, ammonium propionate, etc.) in prevention of microorganisms activities and undesirable spoilage process of total mixed ration (TMR) for cattle feeding during the summer months. Meals treated with these acids have a lower total number of bacteria and yeasts (cfu/g) for 25 to 78%, are less heated up, and are eaten better. Usage of these acid (1-2 L/t of food) does not require the use of expensive equipment. Purchase costs are compensated by the nutrients less loss and more milk production. Protection of TMR meals by organic acids is justified in the cattle diet once a day and at a time of high summer temperatures.U radu je prikazana efikasnost organskih kiselina (sorbinska, benzijeva, kiseline palminog i koksovog ulja, amonijum propionat i dr.) u sprečavanju aktivnosti mikroorganizama i nepoželjnih procesa kvarenja potpunih mešanih obroka (TMR) za ishranu goveda. Obroci tretirani ovim kiselinama imaju manji ukupan broj bakterija i kvasaca, slabije se greju i bolje konzumiraju. Korišćenje kiselina (1-2 L/t hrane) ne zahteva upotrebu skupe opreme. Troškovi nabavke se nadoknađuju manjim gubitkom hranljivih materija i većom proizvodnjom mleka. Zaštita TMR obroka organskim kiselinama ima opravdanje u ishrani goveda jednom dnevno, posebno u vreme visokih letnjih temperatura
