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.

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Record number 407873
Title Laying hens selected for low mortality: Behaviour in tests of fearfulness, anxiety and cognition
Author(s) Nordquist, R.E.; Heerkens, J.L.T.; Rodenburg, T.B.; Boks, S.; Ellen, E.D.; Staaij, F. van der
Source Applied Animal Behaviour Science 131 (2011)3-4. - ISSN 0168-1591 - p. 110 - 122.
Department(s) Animal Breeding and Genetics
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) spatial working-memory - contrasting adrenocortical responsiveness - holeboard discrimination task - path elimination problem - open-field behavior - rhode-island red - domestic chicks - feather pecking - poultry welfare - animal-welfare
Abstract Feather pecking and cannibalism in chickens can lead to injury or to death of the victims, and is thus a serious welfare and economic issue in modern poultry farming. A sib selection scheme has been initiated to genetically select a low mortality line (LML), which shows decreased mortality due to cannibalism compared to a control line (CL). To determine whether undesired behavioural effects such as impaired cognition, increased fearfulness, or increased anxiety might have inadvertently been co-selected, we tested hens from the fourth generation of selection (n = 9 per selection line) in several behavioural tasks. When tested in a 122 cm × 122 cm open field at age 7 days, the lines showed no differences in locomotion or vocalization. In a T-maze test in which the chickens could navigate to find conspecifics, testing sociality and fearfulness, 12 to 16-day-old CL chickens showed a lack of exploratory behaviour; they did not leave the start box. In contrast, most LML chickens negotiated the maze, and approximately half of them found and stayed close to their conspecifics. This difference points toward higher levels of fearfulness in the CL than LML. In a voluntary approach test assessing fearfulness for humans, conducted when the chicks were 26 days old, the LML approached a familiar human faster, thus displaying lower levels of fearfulness. The same birds were tested in a holeboard test at an age of 25–65 days, the first time this test of spatial memory has been used in an avian species. Our results demonstrated high levels of working memory performance and low levels of reference memory performance in both lines, with no differences between the lines. Overall, the present results indicate that unwanted behavioural effects were not co-selected with selection on low mortality, and support the feasibility of the use of the LML in farming practice
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