The fetal sound environment of sheep

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Science  06 Jun 1980:
Vol. 208, Issue 4448, pp. 1173-1174
DOI: 10.1126/science.7375927


Hydrophones implanted inside the intact amniotic sac recorded sounds available to fetal lambs. Unlike recordings made from outside the intact amnion in human subjects, sounds produced at levels similar to normal conversation from outside the ewe were picked up without masking by maternal cardiovascular sounds. Noises from inside the mother were intermittent and linked to her activity.