Background: Rhythmicity in core body temperature has been extensively studied in humans and
laboratory animals but much less in farm animals. Extending the study of rhythmicity of body
temperature to farm animals is important not only from a comparative perspective but also from
an economic perspective, as greater knowledge of this process can lead to improvements in
livestock production practices. In this study in cattle, we investigated the maturation of the daily
rhythm of body temperature in newborn calves, characterized the parameters of the daily rhythm
in young cows, and studied the oscillation in body temperature associated with the estrous cycle
in adult cows.