Diagnostic Tests for Confirmation of Mating in Adult Female Wistar Rats: An Experimental Study

Abstract

Introduction: The assessment of confirmation of mating in rats is a procedure which requires expertise with caution, and careful execution. Rats are spontaneous ovulators and are widely used to study the reproductive system. Aim: The aim of the present study study was to compare diagnostic tests for confirming mating in adult female wistar rats. Materials and Methods: The present experimental research was duly approved by the Institutional Animal Ethical Committee and conducted at the Centre for Toxicology and Developmental Research (CEFTE) at Sri Ramachandra Institute of Higher Education and Research (Deemed to be University). The study was conducted in December 2019. A total of 72 adult Wistar rats (36 males and 36 females) were used in the study. To identify the event of mating, the rats were subjected to the following confirmatory methods: naked eye examination, non invasive vaginal lavage method, and abdominal palpatory method. Data were subjected to statistical analysis using non parametric tests with SPSS software (version 25.0). The level of significance was set at p<0.05. Comparison of all three methods was done using non parametric tests (post hoc with Wilcoxon signed-rank test). Results: The non invasive vaginal lavage method was found to be more accurate (72.22%) compared to the visual method (16.66%) and the abdominal palpatory method (11.11%). A significant difference was seen when comparing the three methods using post hoc with Wilcoxon signed-rank test (p≤0.05). Conclusion: Based on the findings, it can be concluded that the vaginal lavage method is more specific and easy to confirm the occurrence of mating in adult female Wistar rats. The non invasive vaginal lavage method is a simple, easy, and accurate method for estimating pregnancy in cohabitating/generation studies.