A manure spreader implement has a compartment for containing manure, a conveyor for displacing manure in the compartment towards a rear end of the implement, and a rotating beater assembly at the rear end of the implement for spreading the manure outwardly from the rear end of the implement. The implement further includes (i) support brackets for supporting the mounting fasteners of the beater teeth on the auger of the beater assembly in double shear, (ii) auxiliary paddles supported by removable fasteners on the auger of the beater assembly between the auger flighting above and the lower paddles of the auger below, and/or (iii) floor slats on the conveyor which have end portions of reduced internal dimension formed by crimps that allow relative sliding between the floor slats and the mounting bars on the chain of the conveyor.
