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The maternal pheromone of the rat: testing some assumptions underlying a hypothesis
Insights
Rat pups consume maternal pheromone-containing feces, rich in deoxycholic acid, between 14 and 27 days. This behavior suggests pups ingest deoxycholic acid to support gut immunity and brain development.
Area of Science:
- Animal Behavior
- Developmental Biology
- Steroid Biochemistry
Background:
- Maternal pheromones play a crucial role in offspring development and behavior.
- Preweanling rats exhibit specific behaviors related to maternal cues.
- Deoxycholic acid is a bile acid with potential roles in immune and neurological development.
Purpose of the Study:
- To investigate the consumption patterns of pheromone-containing feces by preweanling rats.
- To identify key compounds within maternal pheromone-containing feces.
- To test the hypothesis that deoxycholic acid is ingested by young rats in response to maternal pheromones.
Main Methods:
- Behavioral observation of preweanling rat pup feeding habits.
- Analysis of fecal content for specific steroid compounds.
- Assessment of deoxycholic acid levels in young rats.
Main Results:
- Preweanling rats (14-27 days) preferentially consumed feces containing maternal pheromones.
- These feces were found to be rich in deoxycholic acid.
- Young rats showed a deficiency in deoxycholic acid.
Conclusions:
- Rat pups ingest deoxycholic acid from maternal pheromone-containing feces.
- Deoxycholic acid intake is hypothesized to promote gut immunocompetence.
- Ingestion of deoxycholic acid may also support brain myelination in developing rats.
Abstract:
Herein we report four experiments relating to the maternal pheromone of the rat that show (a) preweanling young consume pheromone-containing feces most conspicuously between 14 and 27 days; (b) they consume those feces preferentially; (c) such feces contain high levels of deoxycholic acid; and (d) preweanling young are deficient in deoxycholic acid. The data of these experiments lend support to the hypothesis that in responding to the pheromone the young ingest deoxycholic acid, a steroid believed to promote gut immunocompetence and brain myelination.