Effect of Seasonal Variations on Organ Weights (Fat, Liver and Gonads) In a Male Poikilotherm Vertebrate, Uromastyx Hardwickii

Abstract

Objective: Uromastyx hardwickii, a local lacertilian species, is widely distributed in the Indo-
Pakistan subcontinent and inhabits mostly the arid regions of the country. This study has been
carried out to assess the seasonal variations on fat, liver and gonads in a poikilotherm vertebrate
species and to develop an experimental model for the study of lipid metabolism in higher
vertebrates including mammals.
Material and Methods: This cross-sectional study was carried out on male Uromastyx
hardwickii (n=60). On sacrificing the animals, abdominal fat pads, liver and gonads were quickly
removed, cleaned and weighed.
Results: Maximal increase in fat pad weight was observed in autumn. Liver weight was
significantly maximal in autumn and less in summer while testicular weights showed marked
seasonality in weight and maximum increase in spring and decrease in summer.
Conclusion: Lipid metabolism in Uromastyx hardwickii undergoes significant alteration in
relation to season. There is significant (P < 0.05) increase in liver weight, fat pad and testicular
weight during different parts of the year