Simple SummaryCows are usually kept in indoor housing. They receive daily feed of similar composition at fixed times. A regular daily routine means that the cows’ behavior during the day is usually similar and does not vary from day to day. Cows grazing on pasture, however, must adapt their behavior to the changing composition of the grasses. The study was conducted on 64 Holstein-Friesian (HF) cows and 54 Brown Swiss (BS) cows between August 2016 and October 2017. The animals were equipped with sensors measuring the time spent on feed intake, rumination, physical activity, and rest. In winter, the cows were fed mainly on hay, while in summer, they took forage from pasture or freshly cut forage distributed in the barn. The study also showed behavioral differences between the HF and BS breeds. HF cows, regardless of location or forage type, spent more time foraging and chewed less than BS cows. A similar relationship was observed across all the lactation groups being studied.AbstractCow pasturing poses many logistical and nutritional problems. Animals have more difficulty accessing pasture feed and require more time to consume the equivalent amount of dry matter compared to total mixed ration (TMR) feed from a feed table. The study was conducted during August 2016–October 2017 on 64 Holstein-Friesian (HF) cows and 54 Brown Swiss (BS) cows. All animals were equipped with CowManager sensor devices, and the cows’ behaviors were recorded: time spent on feed intake, rumination, physical activity, and rest. In winter, cows were mainly fed hay, while in summer, they took forage from the pasture or freshly cut forage provided in the barn. The study showed that the time of day had a significant (p< 0.001) effect on the cows’ feeding behaviors. The study also showed behavioral differences between HF and BS breeds. HF cows, regardless of the location and type of feed provided, spent more time on feed intake and chewed less compared to the BS breed. These differences were observable in all studied lactation groups. Animals were most willing to take forage two hours before sunrise and two hours before sunset and showed an increased willingness to take feed immediately after leaving the milking parlor.