Related Experiment Videos
Home-orienting behavior in rat pups surviving postnatal or intergenerational malnutrition
Insights
Malnutrition in early life impairs rat pup growth and homing behavior. However, intergenerational malnutrition may allow for adaptation and increased survival rates compared to short-term malnutrition.
Area of Science:
- Nutritional Science
- Developmental Biology
- Animal Behavior
Background:
- Early life nutrition significantly impacts offspring development and behavior.
- Understanding the long-term effects of malnutrition is crucial for developmental studies.
Purpose of the Study:
- To investigate the effects of intergenerational and postnatal malnutrition on rat pup growth, homing behavior, and survival.
- To compare the adaptive responses to short-term versus long-term malnutrition.
Main Methods:
- Three groups of rat pups were studied: intergenerationally malnourished, postnatally malnourished (cross-fostered), and well-nourished controls.
- Growth, eye-opening, homing behavior, and survival rates were assessed during the first 12 days of life.
Main Results:
- Both malnourished groups exhibited impaired growth and delayed eye-opening.
- Homing behavior was similarly impaired in both malnourished groups compared to controls.
- Survival rates were significantly lower in the postnatally malnourished group (50%) compared to intergenerationally malnourished (73%) and control (100%) groups.
Conclusions:
- Intergenerational malnutrition may confer an adaptive advantage, leading to increased survival.
- Early life physical and behavioral deficits are not distinguishable between short- and long-term malnutrition survivors.
- These findings contrast with evidence of more severe long-term behavioral deficits in rats with multiple generations of malnutrition.
Abstract:
Growth and home-orienting behavior were studied during the 1st 12 days of life in 3 groups of rat pups: (1) those with intergenerational malnutrition; (2) those with postnatal malnutrition produced by cross-fostering pups born of well-nourished mothers to lactating females maintained on a low-protein diet; and (3) well-nourished control pups. Growth of pups was impaired in both malnourished groups, and eye-opening was similarly delayed. On tests of homing behavior, both malnourished groups were impaired to a similar extent and were less likely to find their way to the nest than were control pups. However, survival rates were significantly lower (50%) in the postnatally malnourished group but not in the intergenerationally malnourished group (73%), as compared with controls (100%). These findings suggest that adaptation occurs in long-term malnutrition with increased survival. However, physical characteristics and homing behavior in early life are not distinguishable in those surviving short- or long-term malnutrition. This is in contrast to the finding of more severe behavioral deficits in later life among rats subjected to many generations of malnutrition than among those malnourished for only 1 generation.