This paper is devoted to the surname changes performed through administrative channels in the interwar period. The research is based on the announcements of the “Official Gazette of the Republic of Poland” in 1929. The author describes main reasons for the decisions of surname changes taking into account characteristics of avoided surnames and chosen demographic tendencies, especially those connected with the age and profession of applicants. People of Jewish origin, Poles and representatives of other nationalities showed different motives for surname changes. Jews most frequently changed their surnames due to legal reasons — they wanted to legalize the unlawful use of a surname of the so-called ritual father. The changes carried out under the motive of assimilation occurred definitely less often. Non-Jewish applicants changed mainly appellative names, especially those derived from words related to animals. After comparing tendencies occurring before and after World War II one concludes that besides legal and assimilation factors which are particular to the pre-war decades (connected with the ethnic, legal and religious situation of the time), the remaining reasons for the surname changes are universal and do not distinguish the pre-war period from that of the post-war.

The production of domestic protein for feed in Poland is insufficient. The import of feed raw materials, especially soybean, which is genetically modified (GM) is necessity. In 2016, Poland imported about 2 million tonnes of GM soybean. In Poland was introduced a ban for using and production of GM feed (Law – animal feed from 2006). This ban has already been suspended few times, mainly due to the fact, that the complete replacement of imported GM soybean meal with other components was impossible. The Minister of Agriculture and Rural Development appointed “Team for alternative sources of protein”, responsible for finding solutions that will impact on reducing imports and will increase the share of domestic sources of protein in animal feed. To achieve this aim research are needed to indicate plants and their possibilities for using. The aim of the article is to analyse selected feed components such as: soybean and rapeseed meal, sunflower meal and oilcakes. This analysis concerns the area of cultivation of soybean, rapeseed and sunflower, purchase costs of meals and oilcakes, properties of these components and foreign trade in Poland.