"Identifier" - what is it, definition of the term
A unique label, often composed of letters, digits, or symbols, serves to distinguish a specific entity—such as a variable, function, record, or object—within a software system, database schema, or communication protocol, enabling unambiguous reference, retrieval, and manipulation of that entity throughout the program’s execution or data lifecycle.
Detailed information
In laboratory and field research, distinguishing individual rodents requires reliable labeling methods. Common techniques include ear punching, subcutaneous microchip implantation, and tattooing. Each approach provides a unique alphanumeric code that links the animal to its data record.
Ear punching creates a permanent notch pattern on the auricle. The pattern is assigned a specific number and recorded in the study database. Advantages are low cost and ease of application; limitations involve potential tissue irritation and difficulty in reading the code after fur regrowth.
Microchip implantation inserts a passive RFID transponder beneath the dorsal skin. The transponder stores a numeric identifier readable by a handheld scanner. Benefits include high durability, minimal visual impact, and compatibility with automated data capture systems. Drawbacks consist of higher expense and the need for specialized scanning equipment.
Tattooing applies a permanent ink mark on the tail or abdomen. The mark encodes a short numeric or alphanumeric sequence. This method offers visual identification without external devices but may fade over time and requires careful handling to avoid stress.
Selection of a labeling system depends on study duration, required data granularity, and animal welfare considerations. Short‑term experiments often favor ear punches, while long‑term or high‑throughput projects benefit from RFID transponders. All methods must comply with ethical guidelines and be documented in the central tracking system to ensure data integrity.