This experiment was carried out to investigate the effects of the falling feces and residual roughage when rabbit was raised on the interior upper space of the pig pen on the growth of 43 pigs farrowed. Animals were fed either formula feed only (A), formula feed + rabbit feces (B), formula feed + rabbit feces + residual roughage (C), or formula feed + residual roughage (D). Body weight gain, feed consumption and feed conversion of the group A were significantly (p$lt;0.05) poorer, than those of the other groups. Feed cost required to gain 1 ㎏ was considerably (p$lt;0.05) lower in the group C than in the other groups. The concentration of urea N in blood plasma of group D was significantly (p$lt;0.05) higher than those of the other groups. Ham and fat portions of the group B were significantly heavier than those .of the group A.