The paper presents an overview of the solutions used in modern machines for the production of haylage such as round balers and balers. Discussed elements of systems enabling monitoring the process of bales formation and influencing its course, to improve the quality of obtained silage and increase the efficiency and ergonomics of the machine’s operation. Trends of development and reasons for increasing functional integration into single machines were determined. The paper was created as a result of cooperation between ŁUKASIEWICZ Research Network – Industrial Institute of Agricultural Engineering and METAL-FACH sp. z o.o. company located in Sokółka, Poland.