The main goal of the analysis is to determine the efficiency of various types of pig farming. The article presents a drastic decline in the number pigs and pig farms in Poland in recent years. The effect of the changes was reduced self-sufficiency in the production of live pigs. In terms of a decline in the domestic supply of live pigs, there was an increase in imports, mainly of weaners for further fattening. In addition to the dominant closed live pig production system, an open and mixed production system can also be distinguished. Imported weaners constituted the basis for the open farm system, which was conducted in two ways: at farmer’s own cost and contract rearing. The study material consisted of data from Statistics Poland and Farm Accountancy Data Network. The tabular analysis method and correlation indicators were used. The analysis of the efficiency of live pig production under a closed and open farm systems showed that the most effective was a closed system on a larger scale (sales of a minimum of 400–700 fattened pigs per year). The open farm system at farmer’s own cost provided higher income than contract fattening, which guaranteed satisfactory income. However, the open system at farmer’s own cost requires producers to have their own capital to purchase weaners and feed. Obtaining higher income involves greater risk. It was concluded that contract fattening is advisable for producers who have buildings suitable for fattening but who do not have their own funds and are not willing to take risk.