Three trials were conducted to study the effect of processing method on performance, apparent nutrient and amino acid digestibilities in growing-finishing pigs fed lupine seeds. Ground, expanded or flaked lupine seed was prepared for the trials. In trial 1, a total of 72 growing barrows (Landrace×Large White×Duroc, initial BW of 54.22±5.87 kg) were allocated to three treatment diets containing 15% percent of differently processed lupine seed for 28 days. Each treatment had four replicates comprising 6 pigs each. In trial 2, a total of 48 finishing barrows (Landrace×Large White×Duroc, initial BW of 84.40±6.84 kg) were subjected to three treatments for 21 days. The experimental design was the same as trial 1 except for supplementation with 20% of lupine seed. Each treatment had four replicates comprising 4 pigs each. To evaluate the ileal digestibility of amino acids, a total of 9 barrows (Landrace×Large White ×Duroc), with an average initial BW of 41.07±1.98 kg, were fed with ground, expanded or flaked lupine for 7 days. Each pig was