Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

Record number 41503
Title The effect of frustrative non-reward on vocalisations and behaviour in the laying hen, Gallus gallus domesticus.
Author(s) Zimmerman, P.H.; Koene, P.
Source Behavioural Processes 44 (1998). - ISSN 0376-6357 - p. 73 - 79.
Department(s) Chair Ethology
Publication type Refereed Article in a scientific journal
Publication year 1998
Abstract Laying hens are thought to express an expectation of a rewarding event through a specific vocalisation, the gakel-call. It has been suggested that the gakel-call is related to frustration, i.e. the thwarting of behaviour. We investigated if frustrative nonreward (nonreinforcement in a situation that previously was consistently reinforcing) in laying hens is expressed through this gakel-call. Twenty hens of two commercial strains, ten ISA White Leghorn and ten ISA Brown Warren were subjected to a classical conditioning procedure. After 23 h of food-deprivation they were trained, in automated Skinnerboxes, to use red lights as a signal (unconditioned stimulus) for a food reward. After this the hens of each strain were equally divided into two groups of five. They were subjected to a control session (light as conditioned stimulus followed by food reward) and to a frustration session (conditioned stimulus followed by nonreward). Both during the frustration and control session behaviour and vocalisations were recorded. In the White Leghorn strain high levels of alarm-calls are found as indicators of anxiety. In the Brown Warren strain more gakel-calls and an increased locomotor activity are found after frustrative nonreward. In conclusion, both findings suggest that vocalisations could serve as indicators of a laying hen's welfare.
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