✦ LIBER ✦

Defensive distance and immobility in young precocial birds (Gallus gallus)

✍ Scribed by Dr. Harvey J. Ginsburg

Book ID: 102148575
Publisher: John Wiley and Sons
Year: 1975
Tongue: English
Weight: 329 KB
Volume: 8
Category: Article
ISSN: 0012-1630
DOI: 10.1002/dev.420080314

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✦ Synopsis

Abstract

The manifestation and duration of the tonic immobility reaction in 3‐day‐old chicks (Gallus gallus) was found to vary reliably as a function of the spatial proximity between the hand of the experimenter and the immobilized chick. The results of this experiment indicate that young birds are susceptible to immobility and that the maintenance of close spatial proximity is the condition necessary for the occurrence of the reaction in young precocial birds.

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## Abstract Tonic immobility (TI) was induced by means of ventral restraint in White Leghorn chicks within 12‐hr posthatch (Day 0) and, in independent groups, on succeeding days through Day 10. Durations of immobility and eye closure increased and incidence of immobility termination and vocalizatio