Forward (ventral) curvature of the spine in the lumbar and cervical regions.
Notes: - Some degree of lumbar curvature is normal. Excessive curvature (lumbar hyperlordosis) is sometimes called swayback.
- This posture is also associated with a rodent being in heat.
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 773 (https://doi.org/10.1515/pac-2015-1202)