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  1. Effect of hiding places, straw and territory on aggression in group-housed rabbit does

    Contributor(s):: Rommers, Jorine M., Reuvekamp, Berry J. F., Gunnink, Henk, de Jong, Ingrid C.

    Group-housing of rabbit does may be preferred from welfare point of view. However, group-housing causes agonistic behaviour which may cause severe injuries. Severe injuries may be prevented by offering hiding places for attacked does. Providing enrichment (straw) may reduce agonistic behaviour by...

  2. Effects of growth-promoting technology on feedlot cattle behavior in the 21 days before slaughter

    Contributor(s):: Stackhouse-Lawson, K. R., Tucker, C. B., Calvo-Lorenzo, M. S., Mitloehner, F. M.

    There is growing interest in the animal welfare implications of growth-promoting technology used in feedlot cattle, namely hormonal implants, ionophores, antibiotics and β 2-adrenergic agonists. Previous studies have focused on the effects of implants on aggression, but little work has...

  3. Are "pit bulls" different? An analysis of the pit bull terrier controversy (Commenrtary)

    Contributor(s):: Lockwood, R., Rindy, K.

    "This article reviews some of the historical, ethological, and epidemiological evidence relevant to the question of whether pit bull terriers present special animal control problems justifying unusual legislative action."

  4. Behavioral responses of silverback gorillas ( Gorilla gorilla gorilla ) to videos

    Contributor(s):: Maloney, M. A., Leighty, K. A., Kuhar, C. W., Bettinger, T. L.

    This study examined the impact of video presentations on the behavior of 4 silverback, western lowland gorillas (Gorilla gorilla gorilla). On each of 5 occasions, gorillas viewed 6 types of videos (blue screen, humans, an all-male or mixed-sex group engaged in low activity, and an all-male or...

  5. Aggression and social spacing in light horse ( Equus caballus ) mares and foals

    Contributor(s):: Weeks, J. W., Crowell-Davis, S. L., Caudle, A. B., Heusner, G. L.

    Aggression and social spacing were studied in 14 light horse mares and their foals living at pasture. Focal samples were collected on each mare-foal dyad for 6 to 10.5 h from 2 months of foal age until weaning at approximately 4 months of age. Observations on foals continued until approximately 6...

  6. Agonistic behaviour and feather pecking in single-sexed and mixed groups of laying hens

    Contributor(s):: Oden, K., Vestergaard, K. S., Algers, B.

    The effects of the presence of males on female aggressiveness and feather pecking in groups of about 500 laying hens housed in an aviary system were studied. In all, 10 groups of ISA Brown laying hens were observed at 21, 35, 45 and 55 weeks of age on 2 farms, during 2 years. In the second year,...

  7. Agonistic interactions and physiological reactions of top- and bottom-ranking pigs confronted with a familiar and an unfamiliar group: preliminary results

    Contributor(s):: Otten, W., Puppe, B., Stabenow, B., Kanitz, E., Schon, P. C., Brussow, K. P., Nurnberg, G.

    Four trials were carried out, where in each trial during a selection test 2 groups of growing pigs (12 weeks old) with 9 animals each were randomly formed. After a week, the top (TR) and bottom (BR) ranking pig from each group was isolated and kept under single housing conditions. At the age of...

  8. Cannibalism in juvenile blue-swimmer crabs Portunus pelagicus (Linnaeus, 1766): effects of body size, moult stage and refuge availability

    Contributor(s):: Marshall, S., Warburton, K., Paterson, B., Mann, D.

    Factors influencing the rate of cannibalism in juvenile blue-swimmer crabs Portunus pelagicus were investigated under controlled conditions using time-lapse video recordings. This study was undertaken to improve blue-swimmer crab culture and experimentally addressed (1) prey vulnerability (2)...

  9. 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...

  10. Intercat aggression: a retrospective study examining types of aggression, sexes of fighting pairs, and effectiveness of treatment

    Contributor(s):: Lindell, E. M., Erb, H. N., Houpt, K. A.

    48 cases of intercat aggression, presented to the Animal Behaviour Clinic at New York State College of Veterinary Medicine at Cornell University between 1988 and 1994, were examined retrospectively. Clients were contacted by telephone so that the outcome of the treatment programme could be...

  11. Resting and social behaviour of dairy heifers housed in slatted floor pens with different sized bedded lying areas

    Contributor(s):: Nielsen, L. H., Mogensen, L., Krohn, C., Hindhede, J., Sorensen, J. T.

    The hypothesis that an increase in the straw bedded resting area for group housed heifers would increase synchronization of resting behaviour and decrease aggressive and abnormal behaviour was tested. An experiment was conducted on 2 Danish commercial dairy farms with 20 Danish Friesian heifers...

  12. Space use and agonistic behaviour in relation to sex composition in large flocks of laying hens

    Contributor(s):: Oden, K., Vestergaard, K. S., Algers, B.

    Experiments were carried out to test the hypothesis that hens in large flocks have home ranges in parts of the pen and that they form subgroups. In a tiered aviary system (density averaged 16 hens/msuperscript 2 of floor area), 8 flocks of 568+or-59 ISA Brown laying hybrids were kept in pens....

  13. The effects of surgical and chemical castration on intermale aggression, sexual behaviour and play behaviour in the male ferret ( Mustela putorius furo )

    Contributor(s):: Vinke, C. M., Deijk, R. van, Houx, B. B., Schoemaker, N. J.

    The ferret (Mustela putorius furo) has become an increasingly popular pet animal, yet little is known about their behaviour and welfare. Inter- and intra-specific aggression and the intense musky scent are the two main reasons why male ferrets are normally surgically castrated. However, it is...

  14. Agonistic behaviour associated with orphan bison ( Bison bison L.) calves released into a mixed resident population

    Contributor(s):: Coppedge, B. R., Carter, T. S., Shaw, J. H., Hamilton, R. G.

    Aggressive interactions of 43 bison calves (10 months old) released motherless into a 288-member resident bison population of mixed composition were observed. Based on expected observations of aggressive interactions from chi superscript 2 analyses, these 'orphan' calves were recipients of...

  15. Individual aggressiveness of pigs can be measured and used to reduce aggression after mixing

    Contributor(s):: Erhard, H. W., Mendl, M., Ashley, D. D.

    189 pigs were tested for individual aggressiveness in their home pens and categorised as high- or low-aggressive (H or L) according to their attack latency. 88 of these pigs were then mixed in groups of 8, with 4 pigs from each of 2 litters. The combinations used were H/H (4H + 4H), H/L (4H + 4L)...

  16. Measuring aggressiveness in growing pigs in a resident-intruder situation

    Contributor(s):: Erhard, H. W., Mendl, M.

    218 pigs of both sexes from 23 litters aged 7 or 11 weeks were used to examine aggressiveness in growing pigs. Individual pigs were isolated in one half of their home pen and an intruder pig was introduced. This pig was 2 to 3 weeks younger than the resident pig. The time from the first contact...

  17. The relationship between reaction to humans and aggressiveness towards congeners in pregnant sows. (Varia No.9) [French]

    Contributor(s):: Kervella, M., Lensink, J., Bretagne, T. de

    A study was conducted to characterize pregnant sows according to their aggression towards conspecifics and their response during a test approach by humans and to investigate the potential link between these two behavioural characteristics. Observations were made on 133 pregnant primiparous and...

  18. Aggressive behaviour and its relation to oviposition in the domestic fowl

    Contributor(s):: Hughes, B. O.

    Hens in battery cages behave differently from those housed in pens. Laying hens of two strains were housed in cages or pens and the incidence of aggression before and after laying was studied. Little aggression was seen in stable groups, so a strange bird was introduced to stimulate aggressive...

  19. Agonistic behaviour in domestic fowls transferred between cages and pens

    Contributor(s):: Hughes, B. O., Black, A. J.

  20. Changes in activity, spatial pattern and social behavior in calves after grouping

    Contributor(s):: Kondo, S., Kawakami, N., Kohama, H., Nishino, S.

    Twelve 5 month-old Holstein steers, reared alone from 1 week of age, were divided into 2 groups of 6 calves each: Groups A and B. Calves in Group A were penned together in a 14.4 x 28.8 pen, and the position and behaviour of individuals were observed throughout a continuous 153 hr period at 15...