A mattress structure for the comfort of animals in a livestock enclosure, intended to cover the ground of an accommodation area bordered by a circulation corridor, possibly equipped with an excreta collecting grid, said mattress structure comprising: (i) at least one elastic layer, including an upper face that is able to undergo an elastic deformation and that includes at least one location suitable for an animal to rest on, (ii) a base, intended to bear on said ground and to receive said at least one elastic layer, said base comprising at least two juxtaposed parts: - at least one front plate, intended to be placed remote from said circulation corridor, under a longitudinal front strip of said at least one elastic layer, and - at least one rear stringer, intended to be interposed between said circulation corridor and said at least one front plate, under a longitudinal rear strip of said at least one elastic layer, said at least one front plate and said at least one rear stringer each comprising two opposite faces: - a lower face (41, 51), intended to rest on the ground, and - an upper face (42, 52), intended to serve as a receiving surface for said at least one elastic layer, said opposite faces (41, 42) of said at least one front plate extending parallel, or at least approximatively parallel, to each other, and said opposite faces (51, 52) of said at least one rear stringer converging from a front border intended to be juxtaposed to said front plate, towards an opposite rear border, intended to be juxtaposed to said circulation corridor, characterized in that the width of said at least one rear stringer is greater than 100 mm, and in that the opposite faces (51, 52) of said at least one rear stringer define between each other a slope from 1 to 10 %. said mattress structure comprising: (i) at least one elastic layer, including an upper face that is able to undergo an elastic deformation and that includes at least one location suitable for an animal to rest on, (ii) a base, intended to bear on said ground and to receive said at least one elastic layer, (i) at least one elastic layer, including an upper face that is able to undergo an elastic deformation and that includes at least one location suitable for an animal to rest on, (ii) a base, intended to bear on said ground and to receive said at least one elastic layer, said base comprising at least two juxtaposed parts: - at least one front plate, intended to be placed remote from said circulation corridor, under a longitudinal front strip of said at least one elastic layer, and - at least one rear stringer, intended to be interposed between said circulation corridor and said at least one front plate, under a longitudinal rear strip of said at least one elastic layer, - at least one front plate, intended to be placed remote from said circulation corridor, under a longitudinal front strip of said at least one elastic layer, and - at least one rear stringer, intended to be interposed between said circulation corridor and said at least one front plate, under a longitudinal rear strip of said at least one elastic layer, said at least one front plate and said at least one rear stringer each comprising two opposite faces: - a lower face (41, 51), intended to rest on the ground, and - an upper face (42, 52), intended to serve as a receiving surface for said at least one elastic layer, - a lower face (41, 51), intended to rest on the ground, and - an upper face (42, 52), intended to serve as a receiving surface for said at least one elastic layer, said opposite faces (41, 42) of said at least one front plate extending parallel, or at least approximatively parallel, to each other, and said opposite faces (51, 52) of said at least one rear stringer converging from a front border intended to be juxtaposed to said front plate, towards an opposite rear border, intended to be juxtaposed to said circulation corridor, characterized in that the width of said at least one rear stringer is greater than 100 mm, and in that the opposite faces (51, 52) of said at least one rear stringer define between each other a slope from 1 to 10 %.