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  1. Welfare implications of captive primate population management: behavioural and psycho-social effects of female-based contraception, oestrus and male removal in hamadryas baboons ( Papio hamadryas ). (Special issue: Primates in zoos)

    Contributor(s):: Plowman, A. B., Jordan, N. R., Anderson, N., Condon, E., Fraser, O.

    In response to overpopulation, management actions were taken over a 5-year period to reduce group size and slow the population growth rate of hamadryas baboons at Paignton Zoo Environmental Park. Management involved three planned removals of several individuals and implantation of all adult...

  2. 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...

  3. Assessing dominance in sheep in a competitive situation: level of motivation and test duration

    Contributor(s):: Erhard, H. W., Fabrega, E., Stanworth, G., Elston, D. A.

    The dominance structure in an established group of sheep is often difficult to determine in the field, because of the low frequency of agonistic interactions, often resulting in some pairs of animals not interacting at all in the observation period. A solution to this problem is to test each pair...

  4. Behavior of picketed circus elephants

    Contributor(s):: Friend, T. H.

    The behaviour of 14 female Asian (Elephas maximus) and 3 female African (Loxodonta africana) elephants who performed 2 shows each day with a circus that travelled to a new location (40 to 250 km from the previous day's lot) daily, was studied. When not performing or working, the elephants were...

  5. Behaviour of Zebu and crossbred cows in restricted suckling groups. (Special issue: Suckling)

    Contributor(s):: Das, S. M., Redbo, I., Wiktorsson, H.

    The aim of this study was to investigate whether Zebu (Bos indicus) and crossbred (Bos indicus x Bos taurus) cows differ in maternal related behaviour during restricted group suckling. The behaviours of 20 Zebu and 16 crossbred cows were recorded during two 30-min sessions each day after milking...

  6. Differences in skeletal and ornamental traits between laying hen cannibals, victims and bystanders

    Contributor(s):: Cloutier, S., Newberry, R. C.

    The size of skeletal and ornamental traits, and asymmetries in bilateral skeletal traits, between victims of cannibalism, cannibals and bystanders within small groups of caged female White Leghorns at the time of cannibalistic attacks (i.e. injurious pecks resulting in bleeding) were compared. It...

  7. Dominance relationships between sows dependent on the time interval between separation and reunion

    Contributor(s):: Hoy, S., Bauer, J.

    One hundred thirty-six sows were weaned from farrowing crates into groups of eight sows of mixed origin and housed in a straw-bedded stimulation pen. The groups were transferred to individual stalls after 4 days in loose housing and artificially inseminated. After either 7 or 28 days in single...

  8. Effects of repeated regrouping on horse behaviour and injuries

    Contributor(s):: Christensen, J. W., Sondergaard, E., Thodberg, K., Halekoh, U.

    Domestic horses are faced with social challenges throughout their lives due to limitations in social contact, space restrictions and frequent changes in social companionship. This is in contrast to natural conditions where horses live in relatively stable harem bands. Currently, little is known...

  9. Increasing the interval between winter outdoor exercise aggravates agonistic interactions in Herens cows kept in tie-stalls

    Contributor(s):: Castro, I. M. L., Gygax, L., Wechsler, B., Hauser, R.

    Cows of the dual-purpose Herens breed are highly motivated to engage in dominance interactions and thus famous for the cow fights traditionally organised by Swiss breeders. However, this characteristic may result in excessively aggressive behaviour when cows kept in tie-stalls meet during winter...

  10. 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)...

  11. Loose housing of small goat groups: influence of visual cover and elevated levels on feeding, resting and agonistic behaviour

    Contributor(s):: Aschwanden, J., Gygax, L., Wechsler, B., Keil, N. M.

    Frequent social conflicts among goats due to their strict rank relationships can pose problems in loose housing of goats by negatively influencing feeding and resting times of low-ranking group members. In this study, we tested whether enrichment of loose-housing pens with structural elements...

  12. 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...

  13. Regrouping rabbit does in a familiar or novel pen: effects on agonistic behaviour, injuries and core body temperature

    Contributor(s):: Graf, S., Bigler, L., Failing, K., Wurbel, H., Buchwalder, T.

    Regrouping female rabbits in group-housing systems is common management practice in rabbit breeding, which may, however, induce agonistic interactions resulting in social stress and severe injuries. Here we compared two methods of regrouping female rabbits with respect to their effects on...

  14. Social behaviour in stallion groups ( Equus przewalskii and Equus caballus ) kept under natural and domestic conditions

    Contributor(s):: Christensen, J. W., Zharkikh, T., Ladewig, J., Yasinetskaya, N.

    The aim of this study was to investigate social behaviour in differently reared stallions in their respective environments; one group of stallions was reared under typical domestic conditions whereas the other group was reared and lives under natural conditions. The domestic group consisted of...

  15. Two's company? Solitary vixens' motivations for seeking social contact

    Contributor(s):: Hovland, A. L., Akre, A. K., Flo, A., Bakken, M., Koistinen, T., Mason, G. J.

    The flexible social organisation in red foxes (Vulpes vulpes) suggests that social contact could enrich the housing of silver fox vixens (a selected line of red foxes) farmed for their fur. To investigate their social motivation, adult vixens housed in an operant apparatus were allowed to pull a...

  16. Use of perches and nestboxes by laying hens in relation to social status, based on examination of consistency of ranking orders and frequency of interaction

    Contributor(s):: Cordiner, L. S., Savory, C. J.

    Four groups of 15-19 adult ISA Brown hens were studied in pens to assess the relationship between social status and use of perches and nestboxes. This was to test the hypothesis that subordinate hens use these resources more by day, for avoiding dominants, but that dominants use perches more at...

  17. Comparative social cognition

    Contributor(s):: Emery, N. J., Clayton, N. S.

  18. 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...

  19. 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...

  20. Agonistic and mating behavior of adult chickens modified by social and physical environments

    Contributor(s):: Craig, J. V., Bhagwat, A. L.

    Agonistic and mating behaviour in 48 flocks of adult White Leghorn fowls was observed for 8 wk. A factorial experimental design allowed evaluation of behaviour as affected by genetic strain, presence or absence of males , age group (initial ages of 32 or 48 wk), and less crowded floor pens...