Ontogeny of behavior in mice selected for large size

Area of Science:

• Developmental biology
• Animal behavior
• Genetics

Background:

• The Goodale Giant inbred (G/Gw) strain exhibits rapid growth and increased size compared to random-bred strains.
• Understanding developmental trajectories is crucial for interpreting strain-specific behaviors.

Purpose of the Study:

• To compare the developmental trajectory of reflex responses and behavioral components in G/Gw mice versus random-bred mice.
• To investigate whether rapid growth and larger size in G/Gw mice influence their behavioral maturation.

Main Methods:

• Developmental assessment of 13 reflex responses and behavioral components.
• Comparative analysis between G/Gw mice and a random-bred mouse strain (n=61).

Main Results:

• Significant differences in several behavioral responses were observed between the G/Gw and random-bred groups.
• The direction of these observed differences was inconsistent across various responses.
• No direct correlation was found between rapid growth/increased size and altered behavioral maturation in G/Gw mice.

Conclusions:

• While G/Gw mice show developmental differences, their accelerated growth and larger size do not appear to be the primary drivers of these behavioral variations.
• Further research is needed to identify the specific genetic or environmental factors influencing behavioral maturation in this strain.