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In this feeding trial, 324 head of 21-day-old purebred Large White piglets were randomly allocated to three dietary treatment groups, A, B and C, with six replications of 18 piglets in each treatment.Group A was the control group on the regular ration using 9% fish meal in the Phase-1 feeding period from 21-35 days of age,and 7% fish meal in the Phase-2 feeding during 35-49 days of age.