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Updated: Aug 15, 2026

Determination of Reproductive Competence by Confirming Pubertal Onset and Performing a Fertility Assay in Mice and Rats
Published on: October 13, 2018
Protocol for determining fertility while breastfeeding and not in cycles
Richard J Fehring1, Mary Lee Barron, Mary Schneider
1Marquette University College of Nursing, Institute for Natural Family Planning, Milwaukee, Wisconsin 53201-1881, USA. Richard.fehring@marquette.edu
Abstract:
A protocol was developed and evaluated for nonovulating breastfeeding women to determine potential fertility with an electronic hormonal fertility monitor. The amount of required abstinence (i.e., days of potential fertility) through the first menstrual cycle indicated by the fertility monitor was significantly lower (17% of the total days) compared with the amount of abstinence (50% of the total days) indicated by the self-observation of cervical mucus.
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