An improved technique for repeated gavage administration to rat neonates

Chiaki Watanabe, Makiko Kuwagata, Shinsuke Yoshimura

doi:10.1111/j.1741-4520.2003.tb01041.x

An improved technique for repeated gavage administration to rat neonates

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improved technique for repeated gavage administration to rat neonates

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ABSTRACT The technique for gavage administration to rat nurslings was improved to allow determination of the direct effects of chemical substances in the nurslings. Rat neonates were treated with distilled water from postnatal day 1 through 20 using this technique. The viability of neonates during the administration period was comparable to that of untreated neonates. No adverse effects of this technique on the development of neonates were found, and no histological alterations of the esophagus or pharynx. Therefore, we conclude that use of our improved gavage administration method will contribute to ensuring successful neonatal development and thus allowing accurate assessment of the toxicological effects of test compounds on rat nurslings.