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464 PROCEEDINGS OF INTERNATIONAL SCIENTIFIC CONFERENCE ON APPLIED BIOTECHNOLOGYTable 4. Weaning age, weaning weight, and ADG of HF weaned calves raised in Phu Yen by seasonVariable Birth seasonN (calves) Mean SE MeanStandard deviation VarianceCoefficient of variation %Weaning age (days)Winter 180 79.161 0.799 10.718 114.873 13.54Spring 161 80.137 0.784 9.943 98.856 12.41Weaning weight (kg/calf)Winter 180 90.6 0.991 13.283 176.441 14.66Spring 161 96.61 1 12.74 162.2 13.18Weight gain (kg/calf/day)Winter 180 0.7107 0.0112 0.1503 0.0226 21.15Spring 161 0.7554 0.0118 0.1494 0.0223 19.78Figure 4. Weaning weight of HF calves raised in Phu YenFigure 5. Weight gain of HF calves raised in Phu Yen