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Artificial rearing of rat pups using rat milk
Developmental Psychobiology
|March 1, 1990
Summary
Artificial rearing (AR) in Long Evans rats impacts brain development. While diet and surgery both influence organ weights, neither alone fully explains deficits in artificially reared pups.
Area of Science:
- Neuroscience
- Developmental Biology
- Animal Science
Background:
- Artificial rearing (AR) is a method used to study developmental processes in mammals.
- Previous studies have noted brain weight deficits in artificially reared rats.
Purpose of the Study:
- To investigate the distinct contributions of diet and surgical procedures to observed brain weight deficits in artificially reared rats.
- To compare the effects of rat milk versus a replacement formula in artificially reared pups.
Main Methods:
- Long Evans rat pups were artificially reared (AR) or mother reared (MR).
- AR pups received either rat milk (AR-MOM) or a replacement formula (AR-MES).
- MR pups underwent sham surgery (MR-SHAM) or no surgery (MR-CONT).
- Brain and visceral organ weights were measured on day 7.
Main Results:
- Artificially reared pups (AR-MOM and AR-MES) exhibited smaller whole brain weights compared to mother-reared pups.
- Pups fed rat milk (AR-MOM) showed improved cerebellar and brainstem weights compared to those fed formula (AR-MES).
- Artificially reared pups fed rat milk (AR-MOM) had larger visceral organ weights than other groups.
Conclusions:
- Neither surgical intervention nor diet alone fully accounts for the organ weight differences in artificially reared rats.
- Developmental stage may influence the primary drivers of normal growth, with diet being crucial early on and other factors becoming more important later.