Abstract: A system for tracing members of an animal population throughout a process including moving at least some of the members between a plurality of physically separate locations, the system comprising: a plurality of identification devices, each being attached to, and uniquely identifying, a respective member of the members; a plurality of identification device readers, each capable of being located at a respective physically separate location of the physically separate locations, and each capable of reading the identification devices to uniquely identify the respective member; a data repository comprising one or more records, each of the records (i) being associated with a respective member of the members, and (ii) including a unique animal identifier associated with the identification device attached to the respective member of the members; and a processing circuitry configured to perform a process for storing location change records indicative of location changes of the members during the process.