Treadmill Exercise of Calves with Different Iron Supply, Husbandry, and Work Load

摘要: Summary Experiments were designed to study physiological responses of male veal calves treadmill exercise, dependent on iron intake (20, 35, and 50 mg iron/kg milk powder, respectively). Calves fattened from 75 180 kg BW either restrained or could freely move straw litter. The ADG feed utilization as well haemoglobin the plasma concentration positively influenced by (P ≤ 0.05). At end fattening period, walked a at 0.8, 1.1, 1.3 m/s for 15 min. Resting values all cardiorespiratory parameters similar in groups. During heart rate, respiratory minute volume, oxygen consumption increased after 3 min reached steady-state values, which depended work load. except was rate (which maximum already lowest speed) extraction remained basal level during but part decreased walking). In fed least amount iron, hence with concentrations, lower than other addition, cortisol concentrations most markedly exercise iron.