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  1. Chimpanzees use multiple strategies to limit aggression and stress during spatial density changes

    Contributor(s):: Duncan, Luke Mangaliso, Jones, Megan Anne, van Lierop, Mathew, Pillay, Neville

    The regulation of aggression in captive animals is an important welfare concern. Captive environments typically provide limited space for animals and many species exhibit heightened aggression in response to spatial restriction. However, primates appear to regulate aggression under these...

  2. Bite marks in mink—Induced experimentally and as reflection of aggressive encounters between mink

    Contributor(s):: Hansen, Steffen W., Møller, Steen H., Damgaard, Birthe M.

    For many years, bite marks have been used as an indicator for aggression in mink production systems. However, the validity of bite marks as indicator of aggression has recently been questioned. We therefore tested the following hypotheses: (1) experimentally applied pressure to, or penetration...

  3. Behavioural patterns established during suckling reappear when piglets are forced to form a new dominance hierarchy

    Contributor(s):: Skok, Janko, Prevolnik, Maja, Urek, Tina, Mesarec, Nikolina, Škorjanc, Dejan

    Early life experiences considerably influence the behavioural development of the animals in which the social environment plays a crucial role. Neonatal piglets experience intense social (including aggressive) interactions when compete with their littermates for the access to teats on the sow's...

  4. Behavioural and physiological responses of domestic dogs (Canis familiaris) to agonistic growls from conspecifics

    Contributor(s):: Wood, Penney A., de Bie, Josine, Clarke, Jennifer A.

    Motivation–structural rule theory predicts that a sender producing harsh, low frequency sounds directed at a conspecific modifies the receiver's behaviour, in part, by communicating its willingness to escalate to an attack. Motivation–structural (MS) rules generally assume that receivers respond...

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

    Contributor(s):: Hovland, Anne Lene, Akre, Anne Kathrine, Flø, Andreas, Bakken, Morten, Koistinen, Tarja, Mason, Georgia 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...

  6. Sex ratio, conflict dynamics, and wounding in rhesus macaques (Macaca mulatta)

    Contributor(s):: Beisner, B. A., Jackson, M. E., Cameron, A., McCowan, B.

    Rhesus macaques, like many other primates, live in stable, multi-male multi-female groups in which adult females typically outnumber adult males. The number of males in multi-male/multi-female groups is most commonly discussed in terms of mate competition, where the sex ratio is a function of an...

  7. Same-sized fish groups increase aggressive interaction of sex-reversed males Nile tilapia GIFT strain

    Contributor(s):: Boscolo, Camila Nomura Pereira, Morais, Rosana Nogueira, Gonçalves-de-Freitas, Eliane

    Animals with similar fighting ability can fight harder and longer than animals in asymmetric contests. Thus, the selection of fish by size similarity in husbandry might increase aggressive interactions, and lead to social instability in socially organized fish. We tested the hypothesis that...

  8. Regurgitation and reingestion in bonobos (Pan paniscus): Relationships between abnormal and social behavior

    Contributor(s):: Miller, Lance J., Tobey, Jennifer R.

    Regurgitation and reingestion (R/R) is an abnormal behavior observed in great apes analogous to rumination syndrome in humans. A majority of the research on R/R in non-human primates has focused on gorillas and chimpanzees with little information relating to other species that also engage in this...

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

    Contributor(s):: Graf, Sylvia, Bigler, Lotti, Failing, Klaus, Würbel, Hanno, Buchwalder, Theres

    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...

  10. Investigating behavior assessment instruments to predict aggression in dogs

    Contributor(s):: Bennett, Sara L., Litster, Annette, Weng, Hsin-Yi, Walker, Sheryl L., Luescher, Andrew U.

    This masked controlled study evaluated a group of dogs to determine if the results of two behavior assessments detected aggression in dogs that had a history of aggression according to a validated questionnaire for measuring behavior and temperament traits in dogs. Groups of dogs with or without...

  11. The influence of access to aerial perches on fearfulness, social behaviour and production parameters in free-range laying hens

    Contributor(s):: Donaldson, Caroline Julie, O’Connell, Niamh Elizabeth

    The aim of this trial was to determine the influence of aerial perches on welfare and production parameters in free-range laying hens. Five commercial free-range houses, each containing between 7000 and 8000 birds, were used. Each house and range area was split in half to create two treatments....

  12. Impact of single-sex and mixed-sex group housing of boars vaccinated against GnRF or physically castrated on body lesions, feeding behaviour and weight gain

    Contributor(s):: Schmidt, Tatjana, Calabrese, Justin M., Grodzycki, Mario, Paulick, Marleen, Pearce, Michael C., Rau, Franziska, von Borell, Eberhard

    Physical castration of male piglets is common practice in many countries for the control of boar taint. A vaccine against GnRF (Improvac®) is licensed in Europe as an alternative to this painful procedure. Vaccinated pigs are known to behave like entire males up to the second vaccination,...

  13. Human-directed contra-aggression training using positive reinforcement with single and multiple trainers for indoor-housed rhesus macaques

    Contributor(s):: Minier, Darren E., Tatum, Lindsay, Gottlieb, Daniel H., Cameron, Ashley, Snarr, Jessica, Elliot, Richard, Cook, Ashleigh, Elliot, Kami, Banta, Kimberly, Heagerty, Allison, McCowan, Brenda

    The objective of this study was to improve human–animal management relationships by testing the effects of positive reinforcement training (PRT) on reducing human-directed aggression in rhesus monkeys (Macaca mulatta). Contra-aggression uses a combination of positive reinforcement training...

  14. Factors affecting dog–dog interactions on walks with their owners

    Contributor(s):: Řezáč, Petr, Viziová, Petra, Dobešová, Michaela, Havlíček, Zdeněk, Pospíšilová, Dagmar

    Little is known about factors influencing dyadic interactions between dogs in public places. This paper reports on the effect of dog age, gender and size, human gender and the use of a leash on the occurrence of body sniffing, scent-marking, playing games, showing a threat and biting in canine...

  15. Exploring aggression regulation in managed groups of horses Equus caballus

    Contributor(s):: Fureix, Carole, Bourjade, Marie, Henry, Séverine, Sankey, Carol, Hausberger, Martine

    Horses are highly social animals that have evolved to live in social groups. However, in modern husbandry systems, single housing prevails where horses experience social isolation, a challenge-to-welfare factor. One major reason for this single housing is the owners’ concerns that horses may...

  16. Evidence for residence-induced enhancement of aggressiveness in the non-territorial pig

    Contributor(s):: Turner, Simon P., Farnworth, Mark J., Mendl, Mike, Erhard, Hans W., Lawrence, Alistair B.

    Wild pigs (Sus scrofa) are only territorial during the peri-parturient period and when young compete for access to teats. In other species, territorial defence is affected by contextual factors including resource quality. Territoriality could be stimulated in species such as pigs by artificial...

  17. Coping personality type and environmental enrichment affect aggression at weaning in pigs

    Contributor(s):: Melotti, Luca, Oostindjer, Marije, Bolhuis, J. Elizabeth, Held, Suzanne, Mendl, Michael

    This study investigated the effects of different environmental treatments and personality types on aggression at mixing of newly weaned domestic piglets. From birth to weaning, 16 litters were housed with their dams in either barren (B) or larger, substrate-enriched (E) environments. At 15 days...

  18. Clustered environmental enrichments induce more aggression and stereotypic behaviour than do dispersed enrichments in female mice

    Contributor(s):: Akre, Anne Kathrine, Bakken, Morten, Hovland, Anne Lene, Palme, Rupert, Mason, Georgia

    Adding environmental enrichments to a previously resource-poor cage or enclosure can sometimes cause elevated aggression in socially housed animals, due to competition over the provided resources. Here, using female C57BL/6J mice, we investigated whether the way that environmental enrichments are...

  19. Breeding against harmful social behaviours in pigs and chickens: State of the art and the way forward

    Contributor(s):: Turner, Simon P.

    Harmful social behaviours are prevalent in commercial farming environments and their reduction through economically feasible husbandry changes is challenging. Selective breeding may offer a complementary approach to reduce the expression of these traits. This article explores the progress made in...

  20. The ability of horses to learn an instrumental task through social observation

    Contributor(s):: Ahrendt, Line Peerstrup, Christensen, Janne Winther, Ladewig, Jan

    The ability of horses to learn through social observation may ease the implementation of new management systems, because the use of automatic feeders etc. by naive horses could be facilitated by observation of experienced horses. However, previous studies found no documentation for observational...