Developmental body of composition of the squirrel monkey (Saimiri sciureus)

Area of Science:

• Primate growth and development
• Comparative anatomy
• Nutritional biochemistry

Background:

• Understanding longitudinal growth and carcass composition is crucial for primate research.
• Squirrel monkeys are a common model organism in biomedical studies.

Purpose of the Study:

• To document the longitudinal growth of squirrel monkeys.
• To analyze the developmental changes in carcass chemical composition.
• To establish relationships between body weight and major carcass components.

Main Methods:

• Longitudinal monitoring of 69 newborn squirrel monkeys.
• Chemical analysis of 51 squirrel monkey carcasses.
• Linear regression and exponential curve fitting to analyze growth and composition data.

Main Results:

• Males were consistently heavier than females throughout development.
• Body weight was highly correlated with age (R2 = 0.999).
• Water and protein content showed linear relationships with body weight, while fat and ash were more variable. Protein increased from 16.3% to 23.8%, and water decreased from 76.4% to 68.9% from birth to adulthood.

Conclusions:

• Squirrel monkey growth and carcass composition are significantly influenced by age and body weight.
• Key developmental changes in protein and water content occur rapidly within the first 20 weeks of life.
• No significant sex differences were observed in the percentage composition of major carcass components when analyzed on a fat-free basis.