Browsing by Subject "Tierwohl"

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Impact of housing environment and rearing condition on the immune system and welfare of laying hens
(2021) Hofmann, Tanja Melanie; Stefanski, Volker
In recent years, consumers’ interest in modern farm animal husbandry and, above all, criticism of intensive production systems that can impair animal welfare, have increased sharply. From hatch, chickens are confronted by a wide range of environmental and social stressors that may confound homeostasis and impair their health and welfare. Not being able to deal with the environment can lead to an activation of the stress system, resulting in a release of neuroendocrine signals like glucocorticoids. These have the potential to modify the immune system and alter species-specific behavior with possible detrimental impacts on animals’ health and welfare. In this context, early-life conditions play a special role as they were shown to have long-term consequences for physiology and behavior in the later life. High stocking densities which activate the hypothalamic-pituitary-adrenal-axis are said to be one of the largest welfare concerns in the poultry industry. Previous research has primarily focused on the effects of stocking density on broilers and adult laying hens, but few studies have focused explicitly on layer pullets, and none of them investigated long-term effects on the immune system. The understanding of short- and long-term consequences of environmental conditions during rearing on the immune system and behavior of layer pullets is essential for shaping an environment that avoids allostatic overload, thus promoting animal health and welfare. This doctoral thesis aimed to identify and evaluate potential immunomodulating factors in the housing environment of chickens. In order to achieve this, it summarizes and reviews important aspects of housing environments for the immune system in chickens. Furthermore, an existing flow cytometric method for the enumeration of leukocytes and discrimination of lymphocyte subsets in blood was adapted to lymphatic tissues. Moreover, short- and longterm consequences of stocking density during rearing on the immune system, stress hormone level and behavior in layer pullets were evaluated. The results are described in detail in three peer-reviewed manuscripts published in international journals. The literature analysis identified several housing conditions as immunomodulating factors. Light management was marked as an effective tool to modulate the immune response in chickens, as long light phases were demonstrated to lower adaptive cellular and humoral immune responses while certain light colors, especially of shorter wavelengths, promote some immune functions. Moreover, particularly high ammonia and hydrogen sulfide concentrations pose a threat to chickens’ health by dampening the adaptive immune response and promoting inflammation. However, the interaction between housing environment and management is complex. Depending on the type of housing form, chickens are confronted with different social and environmental challenges, which in turn can have an impact on the immune and stress system. An understanding of immunosuppressive risk factors is essential for successful poultry management aiming to optimize health, welfare and economic efficiency. To broaden the assessment of immune status for scientific purposes, new staining- and gating strategies for avian lymphatic tissues were adapted to an existing flow cytometric method for blood. The adaptation process showed that the application of already established protocols to other tissues is possible, but has to be examined carefully as tissue-specific effects or cell-preparative procedures might lead to differences in possible combinations of antibody-fluorochrome conjugates. The results of the experimental study within this doctoral thesis demonstrate for the first time that stocking density during rearing has not only short- but also long-term impacts on the immune system in laying hens. Pullets reared at high stocking densities showed stress-related alterations in immune cell numbers and higher incidences of feather pecking that manifest in the laying period. This highlights the significance of early-life conditions for immunocompetence throughout the whole production cycle. Of particular interest is that the number of gamma-delta T cells was lower in the high-density group, which has not been investigated in any stress-related studies with chickens before. The present doctoral thesis provides a significant contribution to the improvement of health and welfare in poultry farming and forms a basis for further research about long-lasting consequences of rearing conditions on the immune system, especially in laying hens.
Nachhaltigkeitsexzellenz in der Landwirtschaft: Mehr Sichtbarkeit für die versteckten Leuchttürme der Alltagspraxis
(2024-09) Gebhardt, Beate; Hellstern, Laura
Im Projekt NEAL wurde die Bedeutung von exzellenter Mikro-Nachhaltigkeit und die Rolle von Nachhaltigkeitsawards sowie weiterer unterstützender Instrumente einer nachhaltigen Transformation in der Landwirtschaft untersucht. Die Erkenntnisse des Projektes sollen landwirtschaftlichen Unternehmen, Verbänden sowie weiteren relevanten Akteuren der land¬wirtschaftlichen Wertschöpfungsketten eine Orientierung geben in den Fragen: • Welche Nachhaltigkeitsthemen benötigen in Zukunft ein größeres Augenmerk? • Wie können Landwirt*innen in ihrer Nachhaltigkeitstransformation gefördert werden? • Welche Rolle spielen Nachhaltigkeitsawards in der Nachhaltigkeitstransformation? Für das Forschungsprojekt NEAL wurden dazu (a) 310 Landwirt*innen und 59 landwirtschaftsnahe Verbände in einem bundesweiten Nachhaltigkeits-Crowd-Screening im Frühjahr 2022 online befragt und hierbei insgesamt 236 herausragende, awardwürdige Nachhaltigkeitsaktivitäten identifiziert, die in der Landwirtschaft bereits umgesetzt oder geplant werden. Mittels Awards-Matching und Clustering wurde (b) der webbasierte, interaktive CSR-Award Finder mit über 150 Wettbewerben erstellt und Ende 2022 online gestellt. Der CSR-Award Finder macht die Welt der Awards für Unternehmen übersichtlicher und einfacher zugänglich, insbesondere erleichtert dies den Zugang kleiner Unternehmen und landwirtschaftliche Betriebe. Zentrale Aussagen der Studie lauten: 1. Nachhaltigkeit ist für Landwirt*innen ein relevantes Thema und viele „versteckte“ nachhaltige Tätigkeiten werden auf den befragten Betrieben bereits umgesetzt. 2. Bio-Betriebe zeigen sich als Vorreiter von Nachhaltigkeitsexzellenz in der Landwirtschaft. 3. Bodennutzung, Biodiversität, regionale Wertschöpfung und Tierwohl sind wichtige Bereiche, in denen viele nachhaltigkeitsbezogene Maßnahmen von Landwirt*innen umgesetzt und als besonders hervorgehoben werden. 4. „Blinde Flecken“ in Nachhaltigkeitsansätzen korrespondieren mit Bewertungen der Landwirtschaft.. 5. Leuchttürme der Mikro-Ebene kommen auf der Makro-Ebene kaum an. 6. Eine heterogene und multifunktionale Landwirtschaft benötigt vielfältige, multiple Instrumente zur Förderung von Nachhaltigkeit auf Betriebsebene. 7. Nachhaltigkeitstransformation in der Landwirtschaft benötigt mehr gemeinsame An-strengungen. 8. Nachhaltigkeitsexzellenz in der Landwirtschaft benötigt mehr Mut und Sichtbarkeit. Die Ergebnisse im Projekt NEAL unterstreichen: Ein Ansatz alleine ist nicht ausreichend. Aufgrund der Heterogenität der landwirtschaftlichen Betriebe gilt dies gerade auch für die Landwirtschaft. Sustainable Finance und Awards sind dabei zwei verschiedene Ansätze bzw. Instrumente, die beide als wichtig und unterstützend gelten, um die Nachhaltigkeitstransformation landwirtschaftlicher Systeme und Betriebe voranzubringen. Beiden Ansätzen wird bescheinigt, ein wichtiges Instrument unter vielen zu sein, aber singulär einen eher geringen Hebel zu haben, da nicht alle landwirtschaftlichen Betriebe damit eingebunden werden können oder sich dadurch angesprochen fühlen. Die Ergebnisse im Projekt NEAL zeigen außerdem, Awards sind in die Toolbox der bekannten Instrumente und Anreize zur Stärkung der Nachhaltigkeitstransformation einzubinden. Sie stehen damit neben ökonomischen Anreizen im Markt oder regulativen Anreize, die vom Staat gesetzt werden. Awards setzen am Positiven und an der Sichtbarmachung des Vorbildhaften und Innovativen in der Landwirtschaft an. Sie können damit das verborgene Besondere, die nachhaltigen Aktivitäten und die versteckten Leuchttürme in der Landwirtschaft, nach außen tragen und zum Leuchten bringen, und damit die Nachhaltigkeits-Motivation der Landwirt*innen erheblich steigern.
Status-Quo und Perspektiven von Zweinutzungshühnern in Baden-Württemberg : Ergebnisse eines World-Cafés im Rahmen des 1. Dialogforums des Projektes „ZweiWert“ am 2.3.2023.
(2023) Bermejo, Gabriela; Imort-Just, Annik; Gebhardt, Beate; Hess, Sebastian; Kiefer, Lukas; Zikeli, Sabine
The motivation behind the growing interest in dual-purpose chicken is diverse. Among other things, it is driven by the prohibition of killing male chicks from laying lines, by the desire to improve animal welfare in general, and by the preservation of genetic biodiversity and a more sustainable poultry production system. The project "ZweiWert" aims to create a regional network of actors in order to build up a value chain for dual-purpose chickens in Baden-Württemberg. Following a status quo and potential analysis of the agricultural production of dual-purpose chicken, a network will be established along the entire value chain, so that a sustainable production as well as a regular supply of the resulting products can be ensured. In order to promote the exchange between actors and to be able to develop policy options and recommendations, dialogue forums will be organized during the course of the project. The first forum took place in March 2023 and brought together representatives from different sectors. After various expert contributions, participants were able to exchange views on different areas of the value chain in the format of a World Café. In particular, the topics of networking and economic efficiency, cooperation, aspects of the legal/political framework and the need for more transparency and communication were mentioned during these discussions.
Zweinutzungshuhn – was ist das? Umfrage unter Landwirt*innen und Geflügelhalter*innen in Deutschland 2022
(2023) Gebhardt, Beate; Bermejo, Gabriela; Imort-Just, Annik; Kiefer, Lukas; Zikeli, Sabine; Hess, Sebastian
To comply with the ban on chick culling that has been in effect since January 2022, the Federal Ministry of Food and Agriculture proposes three alternatives, including the hatching of dual-purpose chickens. In addition to the breeding and economic challenges of establishing dual-purpose animals in the value chain, the inconsistent understanding of what a dual-purpose chicken actually is and how its characteristics can be successfully communicated to consumers are seen as challenges. The goal of this working report is to present what a dual-purpose chicken is and what understanding farmers have of it. The German nationwide online survey among farmers and poultry farmers regarding the understanding and future of dual-purpose chickens was conducted in autumn 2022 as part of the EIP-Agri project "ZweiWert." The EIP project titled "Building Value Chains for Dual-Purpose Chickens in Baden-Württemberg" (ZweiWert) is funded by the Ministry of Food, Rural Areas and Consumer Protection of Baden-Württemberg from 01/2022 to 12/2024. Project partners include the Naturland Association of Baden-Württemberg, several departments of the University of Hohenheim, and many partners from agricultural production and marketing.