Indirect genetic effects for group-housed animals
Alemu, S.W. - \ 2015
Wageningen University. Promotor(en): Johan van Arendonk, co-promotor(en): L.G. Janss; Piter Bijma; P. Berg. - Wageningen : Wageningen University - ISBN 9788793176713 - 228
nerts - pluimvee - groepshuisvesting - genetische effecten - sociaal gedrag - agressief gedrag - interacties - heritability - veredelingsprogramma's - statistische analyse - genetische parameters - selectief fokken - mink - poultry - group housing - genetic effects - social behaviour - aggressive behaviour - interactions - heritability - breeding programmes - statistical analysis - genetic parameters - selective breeding
Alemu, SW(2015) Indirect Genetic effects for Group-housed Animals. Joint PhD thesis between Aarhus University, Denmark and Wageningen University, the Netherlands.
Social interactions among individuals are common both in plants and animals. With social interactions, the trait value of an individual may be influenced by the genes of its interacting partners, a phenomenon known as indirect genetic effects (IGE). An IGE is heritable effect of an individual on trait values of another individual. A large body of literature has shown that social interactions can create addition heritable variation in both plants and animals, for both behavioural and production traits.
When IGE are estimated it is usually assumed that an individual interacts equally with all its group mates, irrespective of genetic relatedness. This assumption may not be true in mixed groups of kin and non-kin, where an individual may interact systematically different with kin and non-kin. Current IGE models ignore such systematically different interactions between kin and non-kin. Thus, the main aim of this thesis was to develop and apply statistical methods to estimate IGE when interactions differ between kin and non-kin.
Social interactions are important in mink that are kept in groups for the production of fur. Group housing of mink increases aggression behaviours, which is reflected by an increase in the number of bite marks on the pelts, and reduces the welfare of the animals. We estimated the genetic parameter for bite mark traits in group-housed mink, to investigate the prospects for genetic improvement of bite mark traits. We found that there are good prospects to produce mink that have a low level of biting. Finally, we further concluded that genetic parameter estimation for bite mark score should take into account systematic interactions due to sex or kin.
In this thesis we also investigated genomic selection for socially affected traits, considering survival time in two lines of brown egg layers showing cannibalistic behaviour. Despite the limited reference population of ~234 progeny tested sires, the accuracy of estimated breeding values (EBV) was ~35% higher for genomic selection compared with the parent average-EBV. We found that the response to genomic selection per year for line B1 was substantially higher than for the traditional breeding scheme, whereas for line BD response was slightly higher than for the traditional breeding scheme. In conclusion, genetic selection with IGE combined with marker information can substantially reduce detrimental social behaviours such as cannibalism in layers and biting in group-housed mink.
Sociable swine : indirect genetic effects on growth rate and their effect on behaviour and production of pigs in different environments
Camerlink, I. - \ 2014
Wageningen University. Promotor(en): Johan van Arendonk; Bas Kemp, co-promotor(en): Liesbeth Bolhuis; Piter Bijma. - Wageningen : Wageningen University - ISBN 9789461739551 - 231
varkens - sociaal gedrag - genetische effecten - groeitempo - diergedrag - agressief gedrag - sociaal milieu - dierlijke productie - selectief fokken - varkenshouderij - pigs - social behaviour - genetic effects - growth rate - animal behaviour - aggressive behaviour - social environment - animal production - selective breeding - pig farming
Social interactions between pigs can influence their health, welfare, and productivity. The effects of social interactions on individuals are partly genetic, and this genetic effect is known as an Indirect Genetic Effect. IGEs are thus the heritable effects of an individual on the trait values of its social partners, e.g. group mates. Previous research has identified IGE for production traits, which suggests that selection for IGE may contribute to selection response. However, validation through selection experiments is required.
The objectives of this thesis were a) to determine the consequences of selection for ‘IGE on growth rate’ (IGEg) for production traits and behaviour of pigs, and b) to study possible mechanisms underlying IGEg in pigs. First, the relationship between pig behaviour and growth rate was studied in several trials. This showed that oral manipulative behaviours directed at pen mates, such as tail- and ear biting and chewing, can reduce growth rate of the victims, whereas receiving social nosing may enhance growth rate. Second, a one-generation selection experiment was conducted in pigs. Sires (n= 24) and dams (n= 64) were selected to create a high vs. low contrast for IGEg in the offspring (n= 480). The contrast was 14 g average daily gain (ADG). Offspring were studied in a 2×2 arrangement with IGEg (high vs. low) and housing conditions (conventional vs. enriched with straw bedding) to examine genotype × environment (GxE) interactions. Selection did not alter production traits, including ADG. Behaviour showed consistent changes, whereby high IGEg pigs showed less biting behaviour towards group mates and objects. High and low IGEg pigs did not differ in aggression or body lesions during 24-h regrouping with unfamiliar pigs. They did, however, differ in aggression towards their own group members when they were reunited after the temporary regrouping test. In combination with other tests and observations, this might indicate that high IGEg pigs are less fearful or less stress sensitive than low IGEg pigs. There were no G×E interactions, but enrichment had a positive effect on behaviour which was additive to that of selection. Despite the lack of response in ADG, genetic selection for IGEg and enriched housing conditions improved the behaviour and welfare of pigs.
Op weg naar succesvol beren houden = Towards successfully keeping boars
Peet-Schwering, C.M.C. van der; Binnendijk, G.P. ; Vermeer, H.M. ; Vereijken, P.F.G. ; Classens, P.J.A.M. ; Verheijen, R.G.J.A. - \ 2013
Lelystad : Wageningen UR Livestock Research (Rapport / Wageningen UR Livestock Research 733) - 44
varkenshouderij - beren (varkens) - berengeur - diergedrag - agressief gedrag - dierenwelzijn - slachtdieren - varkensstallen - seksueel gedrag - pig farming - boars - boar taint - animal behaviour - aggressive behaviour - animal welfare - meat animals - pig housing - sexual behaviour
This study determined the success and risk factors for mounting and aggressive behaviour in boars and for boar taint prevalence. It is possible to keep boars successfully. The risk on sexual and aggressive behaviour is low when everything is optimal for the boars. When the farm conditions regarding feeding and drinking water, housing and climate, health of the pigs and/or management are not optimal, there is a risk that increased levels of sexual and aggressive behaviour and skin lesions will occur.
Effect van licht, groepsgrootte en schuilwand op gedrag van beren = Effect of light, group size and hiding walls on behaviour of boars
Peet-Schwering, C.M.C. van der; Troquet, L.M.P. ; Vermeer, H.M. ; Binnendijk, G.P. - \ 2013
Lelystad : Wageningen UR Livestock Research (Rapport / Wageningen UR Livestock Research 663) - 40
varkenshouderij - beren (varkens) - diergedrag - agressief gedrag - lichtregiem - groepsgrootte - dierenwelzijn - huisvesting, dieren - pig farming - boars - animal behaviour - aggressive behaviour - light regime - group size - animal welfare - animal housing
At Pig Innovation Centre Sterksel it was investigated whether mounting and aggressive behaviour of boars can be reduced by: 1) green light or an increasing light schedule; 2) more total space per pen (24 pigs versus 12 pigs); 3) a hiding wall. Green light, increasing light schedule, more space and a hiding wall did not reduce mounting behaviour. Increasing light however did reduce aggressive behaviour around delivery of the pigs.
Berengeur in de stal is nog matig te sturen
Stevens, R. ; Valeeva, N.I. - \ 2012
Boerderij/Varkenshouderij 97 (2012)36. - p. 16 - 17.
varkenshouderij - beren (varkens) - berengeur - varkensstallen - slachtdieren - varkensvlees - varkensvoeding - agressief gedrag - dierenwelzijn - pig farming - boars - boar taint - pig housing - meat animals - pigmeat - pig feeding - aggressive behaviour - animal welfare
Vleesvarkenshouders kunnen op hun eigen bedrijf het aantal beren met berengeur verminderen. Echter, de maatregelen zijn niet waterdicht.
Reducing sexual behaviour and aggression in male pigs
Vermeer, H.M. ; Houwers, H.W.J. ; Dirx-Kuijken, N.C.P.M.M. ; Peet-Schwering, C.M.C. van der - \ 2011
varkens - agressief gedrag - diergedrag - seksueel gedrag - varkenshouderij - dierenwelzijn - dierlijke productie - beren (varkens) - pigs - aggressive behaviour - animal behaviour - sexual behaviour - pig farming - animal welfare - animal production - boars
The Dutch pig sector moves towards non castration in male piglets. This does not only require a solution to reduce and identify boar taint but also one to reduce typical "male behaviour" like mounting and aggression causing a threat to both animal welfare and performance. The objective was to reduce sexual behaviour and aggression in male pigs by management measures.
Er vroeg bij zijn werkt
Rodenburg, T.B. - \ 2011
De Pluimveehouderij 41 (2011)7. - ISSN 0166-8250 - p. 28 - 29.
pluimveehouderij - verenpikken - kannibalisme - agressief gedrag - dierenwelzijn - poultry farming - feather pecking - cannibalism - aggressive behaviour - animal welfare
Verenpikken voorkomen door te selecteren op lage uitval en door moederkloekprikkels bij de jonge diertjes. WUR-onderzoek laat zien dat het een veelbelovende optie is.
Management and farm characteristics associated with boar taint and aggressive behaviour on Dutch pig farms
Wagenberg, Coen van - \ 2011
pig farming - animal behaviour - animal welfare - aggressive behaviour - boars - boar taint
Maatregelen die het ongewenst gedrag van beren verminderen = Reducing male finishing pig behaviour by management measures
Vermeer, H.M. ; Dirx-Kuijken, N.C.P.M.M. ; Houwers, H.W.J. ; Peet-Schwering, C.M.C. van der - \ 2011
Lelystad : Wageningen UR Livestock Research (Rapport / Wageningen UR Livestock Research 466) - 20
varkenshouderij - beren (varkens) - castratie - diergedrag - agressief gedrag - dierenwelzijn - dierlijke productie - varkens - diergezondheid - pig farming - boars - castration - animal behaviour - aggressive behaviour - animal welfare - animal production - pigs - animal health
To reduce sexual behaviour and aggression in non-castrated male pigs measures were compared. Extra feeders and an obstacle in the pen reduced skin lesions and lameness.
|Agressie tussen voedsters in groepshuisvesting: een beschrijvend onderzoek
Rommers, J.M. ; Jong, I.C. de; Gunnink, H. ; Klop, A. - \ 2011
Konijnenwijzer (2011). - p. 7 - 15.
konijnen - konijnenhokken - groepshuisvesting - huisvesting, dieren - vrouwelijke dieren - zogende vrouwtjes - agressief gedrag - diergedrag - dierenwelzijn - dierlijke productie - rabbits - rabbit housing - group housing - animal housing - female animals - lactating females - aggressive behaviour - animal behaviour - animal welfare - animal production
Wageningen UR Livestock Research heeft nader onderzoek uitgevoerd naar de agressie tussen voedsters die optreedt wanneer ze in groepen worden gehouden. Doel van dit onderzoek is om een beter beeld van de agressie tussen voedsters te krijgen, zodat naar oplossingen kan worden gezocht. Dit artikel beschrijft de bevindingen van dit onderzoek.
|Combihuisvesting van voedsters: Resultaat na een jaar draaien met dit systeem
Rommers, J.M. ; Jong, I.C. de - \ 2011
Kontaktblad N.O.K. / Nederlandse Organisatie van Konijnenhouders 29 (2011)mei. - p. 3 - 7.
konijnen - konijnenhokken - huisvesting, dieren - zogende vrouwtjes - agressief gedrag - vrouwelijke dieren - groepshuisvesting - dierenwelzijn - spenen - slachtdieren - dierlijke productie - diergedrag - diergezondheid - rabbits - rabbit housing - animal housing - lactating females - aggressive behaviour - female animals - group housing - animal welfare - weaning - meat animals - animal production - animal behaviour - animal health
In dit artikel wordt ingegaan op een proef waarin voedsters in groepen zijn gehouden in het zogenaamde combisysteem. De speenkonijnen van deze voedsters zijn gevolgd tot en met het slachten. Het huisvesten van voedsters in een combisysteem heeft geen nadelige invloed op de groei en uitval van de vleeskonijnen en het slachtrendement. Het grootste knelpunt van het combisysteem is de agressie die tussen voedsters optreedt, waardoor huidbeschadigingen bij zowel voedsters als speenkonijnen ontstaan. Meer onderzoek is nodig om een beter beeld van de agressie tussen voedsters te krijgen, zodat naar oplossingen kan worden gezocht.
The accidental city : violence, economy and humanitarianism in Kakuma refugee camp Kenya
Jansen, B.J. - \ 2011
Wageningen University. Promotor(en): Thea Hilhorst. - [S.l.] : S.n. - ISBN 9789085858591 - 273
rampen - oorlog - vluchtelingen - noodgevallen - sociologie - agressief gedrag - organisatie - bevolkingsverplaatsing - economie - vn - niet-gouvernementele organisaties - plaatselijk bestuur - plaatselijke bevolking - kenya - afrika - disasters - war - refugees - emergencies - sociology - aggressive behaviour - organization - resettlement - economics - un - non-governmental organizations - local government - local population - kenya - africa
In this research I examine social ordering processes in Kakuma refugee camp in
Kenya. I view the camp as an accidental city, by which I challenge the image of
the camp as a temporary and artificial waiting space or a protracted refugee crisis
per se. The reference to the city is both metaphorically and physically relevant. First,
the metaphorical dimension of the city places refugees and their negotiation of
space into the realm of the normal and the possible, contrary to prevailing notions
of the camp as an abnormality. In this thesis, I analyze the ways in which refugees
settle down in the camp and inhabit the humanitarian space. From a physical
perspective, the camp has grown into a center of facilities in a wider region of
insecurity, war and marginalized pastoral lands in a semi-desert. Compared to the
region, the camp resembles a multicultural and cosmopolitan place, with various
connections to the wider world.
I have analyzed five domains in which social ordering takes place:
humanitarian governance, the camp as a warscape, the camp economy, third
country resettlement and repatriation. In all these domains, refugees seek to
organize themselves and their surroundings vis-à-vis the humanitarian agencies
and the United Nations High Commissioner for Refugees (UNHCR).
In chapter two, I describe how UNHCR de facto became the government of
the refugee camp on behalf of the Kenyan government. In this capacity it operates
in a confusion of roles; it is both implementer of aid and assistance in the general
administration of the camp, and monitor and guard of States’ obligations to
respect refugee rights. This makes that UNHCR and its implementing NGOs not
only offer, preach and teach entitlements, but are simultaneously for a large part
responsible in their delivery and for the decision of who is granted inclusion in the
camp’s services. I have recognized this in the notion of an entitlement arena,
which highlights how refugees maneuver in the grey area between UNHCR’s
camp governing and rights monitoring roles. The entitlements born out of refugee
and human rights then translate into expectations and promises that become part
of negotiations seeking to align, dodge or alter the camp’s organization. For a
large part, this negotiation takes places along the interfaces between UNHCR and
its implementing partners, and the refugees. By employing participation strategies
in the governing of the camp, UNHCR contributed to the creation of subauthorities,
which play an important role in the referral of refugees within the aid
system, but also in the identification of vulnerabilities.
In the domain of the warscape, I analyze how boundaries between refugee
leadership and rebel movements have blurred, adding and altering these subauthorities.
Apart from the camp having a function in the broader war tactics of
rebel movements in the past and in the present, the notion of the camp as a
warscape highlights how the politics of war and the dynamics of conflict reach
and partly order the camp. This warscape notion, instead of being problematic, is
analyzed from a perspective of place making, through which refugees claim
political agency and room to organize themselves vis-à-vis the refugee regime,
thereby reshaping the living arrangements of the camp and organizing where
people settle on the basis of ethnic and violent histories in the past and in the
camp. This authority transcends into everyday forms of power and governance,
largely because of an understanding of imminent and symbolic violence between
the different groups.
In a socio-economic domain, I describe how refugees build on the resource of
aid and create a diversity of livelihood strategies. Aid, more than just a handout or
a necessity, is comparable to a natural resource in the contours of the camp. For
refugees, once they are allowed inside the camp, aid is simply there. It is
something one can vie for, and can harvest, until it is depleted. I describe this as a
process of “digging aid,” comparable to subsistence farming. On the basis of this
aid, a camp economy has grown, with linkages to informal and formal regional
and international economies. The development of the camp economy has
stimulated socio-economic changes. The local community has found a resource in
the camp and “dropout pastoralists” have settled around the camp in a way that is
comparable to the ways urban migrants flock to cities. The camp represents a
cosmopolitan place where people of different backgrounds come together, meet
each other, and adapt to each other.
The fourth domain, described in chapter five, concerns the camp as a portal
for resettlement. The perspective of third country resettlement in Kakuma has
both been a reason for people to come to the camp, and a phenomenon that
greatly contributed to its development. Resettlement can thus be seen as both an
opportunity as a solution to which people seek access. With this, resettlement
became an organizing principle for people in the camp. The large volume of
resettlement from Kakuma contributes to the character of the camp as a transitory
space. Many informants came to Kakuma not so much to return “home” again,
but to move forward instead. Kakuma as a portal offers migratory routes to those
who manage to be considered eligible according to the agencies’ and receiving
countries’ qualifications. Although imagined as a measure to protect those most in
need, in reality, becoming eligible for resettlement involves a combination of
factors, including access to the agencies and a vulnerability or a fitting identity. It
is here that the warscape and the entitlement arena intertwine to become the
system of resettlement.
Chapter six shows how repatriation becomes subject to maneuvering. Over the
course of my fieldwork, peace broke out in Sudan and repatriation was initiated.
The prospect was complicated, however. In Sudan, public amenities such as
schools, health care, and water were scarce or lacking. Towns and urban centers
were still largely under Arabic influence. The result was that the humanitarian
government in the form of UNHCR and the NGOs sought to control return
movements, while refugees sought to strategize and organize return in their own
ways, and the Sudanese authorities in Sudan sought to keep the refugees in Kenya
until further notice.
The notion of the camp as an accidental city comes back in that the camp was
recognized for its facilities and weighed against the lack thereof in Sudan. New
arrivals similarly came for education, or for basic amenities and even food.
Refugees from other nationalities had concerns because of a possible closure of
Kakuma. Many of them had a rebel or military past, or feared being regarded as
rebels in their home countries, and thus saw limited opportunities to go home.
Also people from town were unsure of what would remain of Kakuma in the
event of the camp being closed.
This research contributes to earlier work in earlier stages of refugee hosting in
other camps, and covering specific subthemes. With the analogy to the city, I
bring together those subthemes in one common frame. The result can in part be
understood as a history of the specific camp of Kakuma. This nicely captures the
title of this research, for something that gains a history breaks free from the frame
of temporality, perhaps by accident. With this approach, this book is not only
relevant for social science or anthropology, but also as a historical record.
Protracted refugee camps constitute an experiment in humanitarian action, but
also in thinking about questions of governance and security in refugee hosting
contexts in developing countries such as Kenya, Tanzania, Ghana, Nepal,
Thailand and other locations where the content of this book may be relevant.
Behind the Scene : the enactments of human sexuality in Tehuantepec, Mexico
Rodriguez, V. - \ 2011
Wageningen University. Promotor(en): Leontine Visser, co-promotor(en): Gerard Verschoor. - [S.l. : S.n. - ISBN 9789085858072 - 324
sociologie - ontwikkeling - ontwikkelingsstudies - seksueel gedrag - vrouwen - man-vrouwrelaties - oefening - voortplantingsgedrag - mexico - centraal-amerika - agressief gedrag - inheemse volkeren - gebruiken - sociology - development - development studies - sexual behaviour - women - gender relations - practice - reproductive behaviour - mexico - central america - aggressive behaviour - indigenous people - customs
This work deals with human sexuality in Tehuantepec, Oaxaca, Mexico, based on the practices performed by the actors in their everyday lives. Here sexuality is not conceived of as a spontaneous or autonomous phenomenon, nor as something that is pre-existing or established, but as the result of complex practices that go beyond the human and the sexual, which are assembled by a set of actors; that is to say, by networks.
The argument is based on the construction of case studies which account for the production of complexities in human sexuality in Tehuantepec. This community was selected because of the notoriety of its women, That belong to the Zapotec ethnic group, often considered to be dominant in the Isthmus.
The purpose of the research was to look beyond the superficial appearance of the Isthmus and its people and to explore in depth the critical moments, achievements and concerns of those who contribute to the enactment of a distinct region and its society. No claim is made, then, to deprive generalizations of their veracity. Instead of focusing on particularities the work concentrates on specificities, or rather, the possible connections that are produced in the interactions between humans and the various elements by which they are surrounded.
The study considers five themes commonly associated with human sexuality: beauty, gendered spatiality, sexual life, motherhood and intimate violence in Tehuantepec had been chosen as axis which articulate the practices and discourses of local actors. Through them, it is argued that sexuality does not form part of something abstract but something that is produced by the interactions that take place on daily life.
Methodologically and conceptually, feminism (above all in its post-structuralism guise), the Actor Oriented Approach, and Actor Network Theory all supported this task. On certain occasions, these schools of thought allowed the identification of deterministic statements and on others the recognition of the binary oppositions or dualisms upon which many of the general perspectives, stereotypes and common positions related to the Isthmus are erected. However, it was Actor Network Theory which led me to non-conventional forms of approaching and understanding the complexity of the human and the social’.
The introduction, or chapter one, presents the historical, economic and cultural processes, which often characterize the region. It becomes clear just how easy it is to fall prey to stereotyped images, as well as the importance of being able to see behind the foreground in order to observe the details, or the specific nature of these traditional landscapes.
The second chapter provides the theoretical and methodological reflection which supports the recognition of the importance of the diverse, the voice of the actors and their connectivity with their surroundings. The chapter arrives at the assembly of associations and the production of complexities in which concepts such as networks, bodies and enactments become keys to the recognition of the assemblages related to human sexuality.
The third chapter introduces the notion of ‘enacting beauty’ in order to suggest that the different Isthmus beauties are produced through a series of dynamic, heterogeneous, multiple and hybrid associations. It also proposes the consideration of Isthmus beauty as something that is malleable and transformable.
The fourth chapter covers the polemical association of spatiality and gender. Here if a link between spatiality and gender is recognized, it is nonetheless considered unstable, impure and fluid, in correspondence with the dynamics that the actors themselves succeed in assembling in their daily lives. Hence, it is suggested that both categories repeatedly crosscut, interweave and overlap; something which is captured by the term ‘entangled boundaries’.
The fifth chapter focuses on some of the possible connections between the Isthmus customs and the practices of the local actors with respect to sexual life. ‘Sexual bodies’ captures these multiple and dynamic connections where the biological, ethnic, cultural and social are neither omnipresent nor exclusive when human sexual life is enacted and re-enacted in Tehuantepec.
The sixth chapter questions the tendency to associate motherhood with the woman, alongside another series of diverse determinisms. The cases explored illustrate how motherhood is a battlefield, in the sense that the actors must remain in constant action, often facing struggles in order to assemble, provide continuity or disconnect from maternal networks. It also touches on additional connections in which motherhood forms part of wider and complex networks.
The seventh chapter considers another of the practices associated with human sexuality that actors confront in their everyday life in Tehuantepec: intimate violence. Here the notion of ‘counteracting intimate violence’ argues for a broader conception of this topic as a complex network. It also highlights actors’ actions in order to make clear that they are not passive victims but dynamic actors who enact other networks which counteract chains of intimate violence.
The eighth chapter, or conclusion, covers the trajectory followed throughout the course of this research in order to make the production of complexities associated with human sexuality visible. It recognizes the necessary shift in reference points in order to move away from a focus on commonplaces. It also identifies human sexuality as a set of practices which can, in turn, be related to different themes and links, or, in other words, as the result of associations.
Bridging troubled waters? : everyday inter-ethnic interaction in a content of violent conflict in Kottiyar Patty, Trincomalee, Sri Lanka
Gaasbeek, T. - \ 2010
Wageningen University. Promotor(en): Georg Frerks; Linden Vincent. - S.l. : s.n. - ISBN 9789085856467 - 370
rampen - conflict - oorlog - etniciteit - etnische groepen - agressief gedrag - voorlichting - irrigatie - waterbeheer - huwelijk - sociologie - sociale differentiatie - sri lanka - zuid-azië - disasters - conflict - war - ethnicity - ethnic groups - aggressive behaviour - extension - irrigation - water management - marriage - sociology - social differentiation - sri lanka - south asia - cum laude
cum laude graduation (with distinction)
Prevalentie van angst en agressie in de Nederlandse populatie Rottweilers
Borg, J.A.M. van der; Graat, E.A.M. - \ 2009
Wageningen : Wageningen Universiteit - 48
honden - rottweiler - diergedrag - agressief gedrag - dierenwelzijn - huisdieren - gezelschapsdieren - dogs - rottweiler - animal behaviour - aggressive behaviour - animal welfare - domestic animals - pets
Om de mate van angst en agressie bij Rottweilers vast te stellen zijn in deze pilotstudy de volgende onderzoeksvragen beantwoord: - Wat is de prevalentie van angst en agressie in de Nederlandse populatie van zowel raszuivere Rottweilers als look-a-likes?; - Is er verschil in de prevalentie van angst en agressie tussen de populatie raszuivere Rottweilers en de populatie look-a-likes?
Controversy over recent West African wars: an agrarian question?
Richards, P. - \ 2004
Copenhagen : University of Copenhagen (Occasional paper ) - ISBN 9788791121128 - 25
oorlog - conflict - agressief gedrag - jeugd - arbeid (werk) - contractarbeid - landbouwhervorming - landbouw - afrika - slavernij - war - conflict - aggressive behaviour - youth - labour - bonded labour - agrarian reform - agriculture - africa - slavery
Agressie bij vleeskuikenvaderdieren: literatuuronderzoek naar achterliggende oorzaken en probleeminventarisatie in de praktijk.
Riedstra, B. ; Jong, I.C. de - \ 2004
Lelystad : Animal Sciences Group (Rapport / Animal Sciences Group ASG03/0028154) - 60
vleeskuikens - pluimvee - pluimveehouderij - agressief gedrag - diergedrag - agressie - kippen - paringsgedrag - vleeskuikenouderdieren - broilers - poultry - poultry farming - aggressive behaviour - animal behaviour - aggression - fowls - mating behaviour - broiler breeders
In dit rapport wordt de problematiek rond veer- en huidbeschadigingen en uitval bij vleeskuikenmoederdieren in relatie tot agressie van vleeskuikenvaderdieren in kaart gebracht, met als uitgangspunt een volledige naleving van het Ingrepenbesluit
Ruwvoer of stro voor drachtige zeugen = Silage or straw for pregnant sows
Mheen, H. van der; Spoolder, H.A.M. ; Kiezebrink, M.C. - \ 2004
Lelystad : Animal Sciences Group (PraktijkRapport / Animal Sciences Group, Praktijkonderzoek : Varkens ) - 17
zeugen - kuilvoer - stro - ruwvoer (roughage) - agressief gedrag - diergedrag - dierenwelzijn - zwangerschap - groepshuisvesting - sows - silage - straw - roughage - aggressive behaviour - animal behaviour - animal welfare - pregnancy - group housing
Varkenshouders dienen agressie tussen varkens te minimaliseren. In groepen zeugen treedt agressie echter regelmatig op, en in wisselgroepen vaker dan in stabiele groepen. Uit onderzoek blijkt dat het gebruik van ruwvoer of stro de agressie en stress kan verminderen. Er is echter ook onderzoek gedaan waaruit bleek dat door stro of ruwvoer zeugen actiever worden, met meer kans op confrontaties tussen de dieren. Het doel van dit onderzoek was de effecten te bepalen van ruwvoer of stro op het welzijn, gemeten aan huidbeschadigingen en eetgedrag, bij zeugen in wisselgroepen
|Tweede ronde verrijking leefomgeving ongekapte kalkoenen: nog steeds veel uitval
Kiezebrink, M.C. ; Veldkamp, T. - \ 2000
De Pluimveehouderij 30 (2000)11. - ISSN 0166-8250 - p. 12 - 13.
huisvesting, dieren - dierenwelzijn - pluimveehokken - kalkoenen - diergedrag - agressief gedrag - prestatieniveau - beschadigingen - instinct - animal housing - animal welfare - poultry housing - turkeys - animal behaviour - aggressive behaviour - performance - injuries
Onderzoek van Praktijkonderzoek Pluimveehouderij naar beperking van pikkerij bij ongekapte kalkoenen door verrijking van de leefomgeving. De dieren maken regelmatig gebruik van de verrijkingen (maagkiezel, graanblokken, houtwolbalen, zitstokken) maar dit leidt niet tot een duidelijke vermindering van uitval en beschadigingen
|Meer beschadegingen bij lichtschema:lichtschema versus continu licht
Veldkamp, T. ; Kiezebrink, M.C. - \ 1998
De Pluimveehouderij 28 (1998)22. - ISSN 0166-8250 - p. 20 - 21.
lichtregiem - diergeneeskunde - kalkoenen - sociaal gedrag - communicatie tussen dieren - agressie - agressief gedrag - light regime - veterinary science - turkeys - social behaviour - communication between animals - aggression - aggressive behaviour
Resultaten van onderzoek naar het effect van het 'verrijken' van de leefomgeving bij onbehandelde hanen en hennen