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  1. Behavioural responses during exposure of broiler chickens to different gas mixtures

    Contributor(s):: Lambooij, E., Gerritzen, M. A., Engel, B., Hillebrand, S. J. W., Lankhaar, J., Pieterse, C.

    Behavioural responses to inhalation of gas were examined during exposure of broilers to different gas mixtures. 137 six-week-old broiler chickens were individually exposed in a gas chamber containing one of the following gas mixtures: 90% argon (Ar)/air, 30% carbon dioxide (CO2)/60% Ar/air or 40%...

  2. Colour preferences of domestic chicks in relation to food and water presentation

    Contributor(s):: Roper, T. J., Marples, N. M.

    The colour preferences of chicks presented with artificially coloured food (chick starter crumbs) and water were investigated. In experiment 1, 96 pairs of chicks received red, green or black food in the form of a small pile of crumbs placed on the floor of the test cage, or red, green or black...

  3. Comparison of individual and social feather pecking tests in two lines of laying hens at ten different ages

    Contributor(s):: Rodenburg, T. B., Koene, P.

    The aim of this experiment was to select a suitable test to measure feather pecking in laying hens. Pecking behaviour in individual and social feather pecking tests was compared with pecking behaviour in the homepen. Two lines of laying hens were used that differ in their propensity to display...

  4. Complexity of behavioural sequences and their relation to stress conditions in chickens ( Gallus gallus domesticus ): a non-invasive technique to evaluate animal welfare

    Contributor(s):: Maria, G. A., Escos, J., Alados, C. L.

    A complexity analysis was performed on the behaviour time series of four groups of seven chickens (Gallus gallus domesticus) using the detrended fluctuation analysis (DFA). DFA quantifies the fractal-like correlation properties of behaviour sequences on short time scales (seconds) over active...

  5. Day-old chicks categorised on latency to peck, exhibit a stable fear pattern until 15 days of age

    Contributor(s):: Salvatierra, N. A., Arce, A.

    Day-old chicks (n=24) of both sexes were individually categorized on the latency to peck pebbles and termed as high latency (HL), moderate latency (ML) or low latency (LL). Anxiolytic doses of diazepam diminished the latency only in the HL category, suggesting that it is the most anxious...

  6. Detrended fluctuation analysis of behavioural responses to mild acute stressors in domestic hens

    Contributor(s):: Rutherford, K. M. D., Haskell, M. J., Glasbey, C., Jones, R. B., Lawrence, A. B.

    Fractal analysis provides a novel measure of behavioural complexity and has previously revealed subtle alterations in behaviour under biologically costly conditions, such as parasitism or disease. The analysis is based upon the temporal pattern of behaviour that, although rarely considered in...

  7. Development of feather pecking in relation to light intensity

    Contributor(s):: Kjaer, J. B., Vestergaard, K. S.

    Medium heavy laying hens (ISA Brown) were reared on litter floor in a cross-over experiment with 4 treatments of age x light intensity: 3 or 30 lux and between 0 and 15 weeks of age and 3 or 30 lux and between 16 and 46 weeks. Feather pecking and behaviour were recorded by focal animal and time...

  8. Development with age of nest box use and gregarious nesting in laying hens

    Contributor(s):: Riber, A. B.

    Use of nest boxes is an important part of the behavioural repertoire of laying hens kept under commercial conditions. A special form of nest box use is gregarious nesting, which occurs when a hen given the choice between an occupied and an unoccupied nest site chooses the occupied nest site....

  9. Developmental instability and light regime in chickens ( Gallus gallus )

    Contributor(s):: Moller, A. P., Sanotra, G. S., Vestergaard, K. S.

    Fluctuating asymmetry, a measure of developmental instability, was measured in 3 skeletal characters in chickens raised under 3 different lighting regimes: (A) a 16:8 light-dark cycle, (B) a changing light regime, and (C) permanent light. Chickens reared under permanent light developed 40% larger...

  10. Differential effects of increased stocking density, mediated by increased flock size, on feather pecking and aggression in laying hens

    Contributor(s):: Nicol, C. J., Gregory, N. G., Knowles, T. G., Parkman, I. D., Wilkins, L. J.

    Six flocks of laying hens were housed in percheries at 4 stocking densities (6, 14, 22 or 30 birds m-2) from 14 to 30 weeks of age. Stocking density was manipulated by changes in flock size (72, 168, 264 or 368 birds) in percheries with the same floor and height dimensions. The pecking behaviour...

  11. Diurnal rhythm of feather pecking behaviour and condition of integument in four strains of loose housed laying hens

    Contributor(s):: Kjaer, J. B.

    2400 chickens from 4 commercial strains, Lohmann Selected Leghorn (LSL), Norbrid 41 (NB), Lohmann Brown (LB) and ISA Brown (ISA) were reared and kept in aviary systems. Feather pecking behaviour was recorded by time sampling from video recordings at 38 weeks of age and condition of plumage, keel...

  12. Divergent selection on feather pecking behaviour in laying hens ( Gallus gallus domesticus )

    Contributor(s):: Kjaer, J. B., Sorensen, P., Su, G.

    A selection experiment was initiated in 1996 in which selection for (HP line) and against (LP line) feather pecking was performed. The foundation stock was a White Leghorn layer strain established in 1970 and maintained since then as a random bred control line at the Institute. Six hatches were...

  13. Do female broiler breeder fowl display a preference for broiler breeder or laying strain males in a Y-maze test?

    Contributor(s):: Millman, S. T., Duncan, I. J. H.

    In recent years, the commercial broiler breeder industry has reported problems of male aggression towards females. Although this aggression is shown by the males and is apparently a defect in their behaviour, it is also possible that it stems in some way from the females. For example, broiler...

  14. Do the stereotypies of pigs, chickens and mink reflect adaptive species differences in the control of foraging?

    Contributor(s):: Mason, G., Mendl, M.

    Species differences in food-related stereotypies and natural foraging behaviour are discussed, and evolutionary explanations for these species differences, and reasons why apparent species differences in stereotypy may be artefacts of husbandry are postulated.

  15. Domestic chicks are attracted to a familiar odorant in a novel test situation: a brief report

    Contributor(s):: Jones, R. B., Carmichael, N. L.

    Naive 11-day-old ISA Brown chicks showed no preferences when vanillin and a coloured water control were presented in petri dishes, simultaneously at opposite sides of a test box. Thus, vanillin possessed no attractive or aversive properties. In a second experiment, when incorporated in the home...

  16. Domestication effects on foraging strategy, social behaviour and different fear responses: a comparison between the red junglefowl ( Gallus gallus ) and a modern layer strain

    Contributor(s):: Schutz, K. E., Forkman, B., Jensen, P.

    According to the resource allocation theory, behaviours that have high energetic costs should decrease in frequency in breeds that are selected to invest a higher proportion of energy into production traits. We studied differences between red junglefowl, the ancestor of domesticated breeds, and a...

  17. Dustbathing and feather pecking in domestic chickens reared with and without access to sand

    Contributor(s):: Norgaard-Nielsen, G.

    Eight groups of 10 female white Leghorn chicks were kept in wire floor cages from 1 day old. From 2 days of age four of the groups had continuous access to a wooden tray with dark dry sand, while the other groups had a wooden frame of the same size but without sand. Low intensity light (10 lux)...

  18. Dustbathing in modified battery cages: is sham dustbathing an adequate substitute?

    Contributor(s):: Lindberg, A. C., Nicol, C. J.

    Dust bathing behaviour was investigated in groups of hens housed in conventional battery cages with no extra facilities, and in different types of modified cages with nest boxes, perches and dust baths. Only one treatment provided a dust bath, but hens were able to perform sham dust baths on the...

  19. Early feather pecking as a form of social exploration: the effect of group stability on feather pecking and tonic immobility in domestic chicks

    Contributor(s):: Riedstra, B., Groothuis, T. G. G.

    In two lines of White Leghorns that differ in their propensity to feather peck, feather pecking was already present one day after hatching. A significant line difference developed within 3 days and this difference remained during the following weeks. There was no clear relationship between...

  20. Effect of acute histamine and pentagastrin on voluntary food intake in growing chickens

    Contributor(s):: Saadoun, A., Alvarez, A. F., Cabrera-Saadoun, M. C.

    Seven male chickens, 5 weeks old, were injected intraperitoneally with histamine 0, 500 or 1000 micro g/kg body weight. Feed intake was measured at 6, 15, 30, 45, 60, 90 and 120 min and water intake at 15, 30, 45, 60, 90 and 120 min after injection of histamine. A second experiment was carried...