The aim of the research was to show the operation of a farming family farm in 2020 year and the projection of consumption and production of feeds for the hypothetical introduction of cattle fattening on the researched family farm Ivica jurić from the village Nijemci of east Croatia. The targeted volume of livestock production was 60 head of cattle delivered per year. The research was conducted by inspecting the business documentation of the researched family farm and the projection method. The researched family farm produces field crops on a total of 48 ha of arable land, with its production intended for sale on the market. The value of delivered goods per unit area is the highest for corn (13,725.00 HRK/ha), followed by wheat (6,654.41 HRK/ha), then soybeans (5,432.69 HRK/ha), and finally sunflower (4,553.57 HRK/ha). According to the projected introduction of year-long fattening of cattle (from 6 months to 1.5 years of age of cattle), in the volume of 60 delivered cattle per year, the researched family farm should convert 61% of its arable land into production of fodder crops for own fattening cattle. Based on the expected selling price of about 15.50 HRK/kg of live body weight and body weight at delivery of about 650 kg/head, the projected value of delivered 60 head of cattle per unit area of forage crops is between 19,897.96 and 21,224.49 HRK/ha. In the cost structure of fattened cattle, the purchase price of calves is a significant item, with about 5,000.00 HRK/head or about 10,204.08 HRK/ha of forage crops. The projection showed that with the introduction of cattle fattening, the delivered value, when reduced by the cost of purchasing calves, would be significantly higher than the values of sunflower, soybean and wheat, but also lower compared to corn. The introduction of cattle fattening would be associated with the necessary investments in facilities for housing cattle and storage of forages, and with investments in machinery for mowing and storing forages. The option of focusing on the production of grass-fed cattle would require the activation of larger areas for grazing and hay production, but also less investment in storage facilities. In grass-fed production, lower feeding costs are expected, but also longer duration of fattening.