In rodents, number of males impregnating females divided by number of males mated, multiplied by
\(\pu{100}\).
Note: This index measures the male’s ability to produce
sperm that are capable of impregnating a female, assuming all mated females are
fertile.
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 768 (https://doi.org/10.1515/pac-2015-1202)