TAIL TATTOO IDENTIFICATION SYSTEM FOR NEONATE AND PRE-WEANLING RODENTS

The Toxicologist
An Official Publication of the Society of Toxicology and Abstract Issues of Fundamental and Applied Toxicology

1865 TAIL TATTOO IDENTIFICATION SYSTEM FOR NEONATE AND PRE-WEANLING RODENTS.

H. Yacowitz, M.E. Weyand, A. Yacowitz and E.H. Weyand. 
Animal Identification and Marking Systems, Inc.. Piscataway, NJ.

Current methods available for the identification of neonate rodents prior to weaning have significant procedural weaknesses that limit their utility. For example, in the case of using a magic marker frequent applications are required; the injection of pigment into paws is time consuming to perform and to read; and toe clipping of animals is invasive and inhumane. A rapidly applied and easily legible alpha numeric tail tattoo system was developed for identifying neonate rodents I day old and up to weaning age. The identific.ation system developed employs a very finely tapered tattoo needle along with a special needle guide. This system allows needle penetration of < 0.5 mm into tail skin without causing bleeding or maceration of tissue. Using this system two digit alpha numeric tattoos were easily placed on the tails of I day old neonates. The placement of numbers required minimum time ? seconds /pup), caused no apparent discomfort or trauma to neonates when applied, and all numbers were legible up to weaning. Tail identification of neonates using the newly developed system had no effect on neonate rejection or eating by the dam. This minimally invasive identificalion system along with pigments (black or colored) previously tested for animal safety were found to be effective for studies in reproductive toxicology and for the identification of transgenic neonates. The results of this research demonstrates that the newly developed identification system provides a safe, rapid. and humane method for identifying neonate rodents.

Abstracts of tbe
36th Annual Meeting
Volume 36, No.1, Part 2,
March 1997

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