| CPC A01K 1/03 (2013.01) [A01K 31/00 (2013.01); A01K 31/005 (2013.01)] | 13 Claims |

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1. An impermeable hollow-moulded panel for an animal house, the impermeable hollow-moulded panel having a side panel including an inward facing surface, a first edge, and a recessed first end portion adjacent the first edge and the inward facing surface, the recessed first end portion defining a plane and having a series of protruding ridges protruding away from the plane and connected by a protruding spine protruding away from the plane, the protruding spine extending in parallel with the first edge and the series of protruding ridges extending along the recessed first end portion at an angle of between 5° and 80° down toward the first edge away from the protruding spine, wherein the ridges in the series of protruding ridges are parallel to each other, and wherein the protruding spine protrudes level with the inward facing surface of the side panel.
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