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Related Experiment Video

Updated: Sep 1, 2025

Extraction and Dissection of the Domesticated Pig Brain

Extraction and Dissection of the Domesticated Pig Brain

Published on: April 25, 2021

The expensive-tissue hypothesis may help explain brain-size reduction during domestication.

Raffaela Lesch¹, Kurt Kotrschal², Andrew C Kitchener³

¹Institute of Animal Welfare Science, University for Veterinary Medicine, Austria.

Communicative & Integrative Biology

|August 12, 2022

Summary

Domestic animals exhibit the domestication syndrome, a collection of traits like floppy ears. The neural crest hypothesis explains these, while the expensive-tissue hypothesis may explain reduced brain size in domesticated species.

Keywords:

Brain size cranial volume gut intestine neural crest

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Area of Science:

Evolutionary biology
Animal genetics
Comparative anatomy

Background:

Domestic animals share a suite of traits known as the "domestication syndrome."
The neural crest/domestication syndrome hypothesis offers a potential unifying explanation for these traits.
However, this hypothesis has an indirect link to reduced brain size, a common feature in domestic animals.

Purpose of the Study:

To explore the potential of the expensive-tissue hypothesis in explaining brain size reduction during animal domestication.
To integrate the expensive-tissue hypothesis with existing theories on the domestication syndrome.

Main Methods:

Literature review and theoretical synthesis.
Comparative analysis of morphological and neurological traits in domestic animals.
Hypothesis testing through conceptual integration.

Main Results:

The neural crest hypothesis effectively explains many domestication syndrome traits.
The expensive-tissue hypothesis provides a plausible mechanism for the reduction of brain size in domestic animals.
Integrating these hypotheses offers a more comprehensive understanding of animal domestication.

Conclusions:

The expensive-tissue hypothesis complements the neural crest hypothesis by explaining brain size reduction.
A combined theoretical framework can better account for the diverse traits observed in domesticated animals.
Further research is needed to empirically validate the integration of these hypotheses.