Abstract: Embodiments of a feed additive delivery device, a system comprising a micro weigh machine and the feed additive delivery device, and a method for using the device and system are disclosed. A particular exemplary feed additive delivery device comprised a feed additive hopper for suppling feed additive to a rotary valve that meters feed additive from the hopper to a blow through assembly having an assembly inlet that receives feed additive from the rotary valve, an assembly outlet through which feed additive is dispensed, and an air port for drawing air into the assembly to facilitate feed additive dispensation through the assembly outlet. The system is useful for batching a composition comprising an animal feed and at least one coated animal feed additive, a delicate animal feed additive, or combinations thereof. For certain embodiments the animals are ruminants and the coated feed additive is a coated methionine product.