Resting was found to be dependent on the interaction between treatment and age (F55167 = 4.66; P = 0.0003; Figure 3); on d 16 and 28 resting occurred more often in the 6065 K compartment ( -4.53 < t < -4.30; P < 0.001),whereas no differences were found on other days (-1.05 < t < 0.33; P > 0.30).