Animal Microchip implant

A microchip implant is an identifying integrated circuit placed under the skin of an animal. The chip, about the size of a large grain of rice, uses passive radio-frequency identification (RFID) technology, and is also known as a PIT (passive integrated transponder) tag. Standard pet microchips are typically 11–13 mm long (approximately 1⁄2 inch) and 2 mm in diameter.

• Externally attached microchips such as RFID ear tags are commonly used to identify farm and ranch animals, with the exception of horses. Some external microchips can be read with the same scanner used with implanted chips.
• Animal shelters, animal control officers and veterinarians routinely look for microchips to return lost pets quickly to their owners, avoiding expenses for housing, food, medical care, outplacing and euthanasia. Many shelters place chips in all outplaced animals.
• Microchips are also used by kennels, breeders, brokers, trainers, registries, rescue groups, humane societies, clinics, farms, stables, animal clubs and associations, researchers, and pet stores.

Usage

• Since their first use in the mid-1980s, microchips have allowed innovative investigations into numerous biological traits of animals.The tiny, coded markers implanted into individual animals allow assessment of growth rates, movement patterns, and survival patterns for many species in a manner more reliable than traditional approaches of externally marking animals for identification.Microchips have also been used to confirm the identity of pets and protected species that have been illegally removed from the wild. 
• Microchips can be implanted by a veterinarian or at a shelter. After checking that the animal does not already have a chip, the vet or technician injects the chip with a syringe and records the chip's unique ID. No anesthetic is required, as it is a simple procedure and causes little discomfort; the pain is minimal and short-lived. In dogs and cats, chips are usually inserted below the skin at the back of the neck between the shoulder blades on the dorsal midline. According to one reference, continental European pets get the implant in the left side of the neck.The chip can often be felt under the skin. Thin layers of connective tissue form around the implant and hold it in place.
• The owner receives a registration certificate with the chip ID and recovery service contact information. The information can also be imprinted on a collar tag worn by the animal. Like an automobile title, the certificate serves as proof of ownership and is transferred with the animal when it is sold or traded; an animal without a certificate could be stolen. There are some privacy concerns regarding the use of microchips.

Livestock

Due to the advantages of microchips, there are many concrete applications of RFID in the agri-food sector covering the majority of usual foods, such as all kinds of meats as well as various vegetables, fruits.The feature of RFID, namely its traceability, makes it possible for the increased security and confidence of customers. As one of the most popular livestock around the world, the health condition of pigs is vital to farmer's income and inevitably influence customers' health. It is challenging to monitor the pigs' health condition individually by using traditional approaches. It is common for diseases to spread from a single pig to nearly all the pigs living in the same pigsty. By adopting the technology of microchips to measure the drinking behavior of individual pigs housed in a group, it is possible to identify a pig's health and productivity state. This kind of behavior is a good indicator of a pig's overall health. Compared to traditional visual observations to determine the pig's health state, RFID-based monitoring of pig drinking behavior is a feasible and more efficient option.

Wildlife

Using microchips in wild animals in biology began with fisheries' studies to determine the efficacy of this method for measuring fish movement. Later, studies that use microchips to track wild animals expanded over the years, including researches on mammals, reptiles, birds, and amphibians. Compared with previous marking and tagging techniques used to identify wild animals before the advent of microchips, such as ear tags and color-coded leg bands,  microchips are visually less obvious and less likely to be detected by prey and predators. Due to the fact that traditional identifications are on the exterior of the animal, tags can be lost, scars can heal and tattoos can fade.

Other useful and significant information can be collected by microchips. Chipped wild animals that are recaptured can provide information on growth rate and change of location, as well as other valuable data such as age structure, sex ratios, and longevity of individuals in the wild. Other researches on small mammals like rats and mice also adopt this technology to determine body temperature of terminally ill animals.As microchips are internal, permanent, durable under harsh environments, and have little influence on animals, more scholars have employed microchip implantation to collect useful data on wildlife researches.

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