Accordingly, in some embodiments of the disclosure, a multi-chambered assay device is provided, which is configured for arrangement on a disc, as well as configured to process an individual sample. A plurality of such assay devices can be arranged along a periphery of the disc at a distance/radius from the center, such that a plurality of individual samples can be processed, e.g., one per assay device. In addition, in an arrangement that a plurality of assay devices are used, they can be spaced apart such that they balance the disc during rotation (which can be with samples contained in one or more of the assay devices, a plurality, a majority, or all of the assay devices).

A control system for mixing materials for livestock feed including a container that receives the materials, agitators that mix the materials in the container, a driveline that drives the agitators at an output speed with an output torque, a power source that provides an input speed at an input torque, a continuously variable transmission that connects the driveline and the power source and having a hydrostatic loop to provide a speed ratio between the input speed and the output speed, a plurality of sensors positioned between the power source and the agitators that provides mixing signals commensurate to mixing parameters, and an electronic control unit configured to receive the mixing signals, extract mixing parameter values from the mixing signals, and actuate the continuously variable transmission and adjust the speed ratio based on the mixing parameter values to enhance efficiency of the mixing of the materials.