Lactation is the most energetically demanding period in small mammals,associating with increased energy intake,but decreased body mass and thermogenic capacity.
Human and laboratory rodent models indicated that some individuals were more prone to become obesity than others.Whether the wild rodents also exhibit the diverse responses to high-fat diet (HFD) and
Sperm competition theory predicts the relationship between pre-copulatory (social status) and post-copulatory (sperm quantity and quality) sexually selected traits is negative,whereas phenotype-linked