COMBINING TOP-DOWN AND BOTTOM-UP APPROACHES TOWARDS SUSTAINABLE LIVESTOCK PRODUCTION A LEARNING AND EXPERIMENTATION STRATEGY

N° ISBN - 978-2-7380-1284-5International audienceOver the past decade, the Dutch Government has increasingly emphasised the need for integral solutions for sustainability problems in the livestock production sector. This led to the adoption of research approaches in line with transition management and system innovation that had been developed in other domains. In 2008, the government set further policy targets of 5% and 100% sustainable livestock production at the farm level for 2011 and 2023 respectively. Policy measures included stimulation of sector initiatives for sustainable agriculture (sectoral innovation agendas) and demand for projects with a focus on system innovation. Two broad approaches may contribute to the realization of these targets, notably top down and bottom up. Top down approaches are usually research-led and characterized by the formulation of visions of future livestock production systems. At the same time a broad variety of bottom up initiatives is taken by farmers who develop and try out new approaches to meet the challenges as they see them. Currently, the links between the bottom up and the top down processes are relatively weak. As both may contribute to a system innovation, a major challenge is to make a fruitful combination between the two approaches. To this end we have developed what we call a “Learning and Experimentation Strategy” (LES) that we will elaborate in the paper

Involving the animal as a contributor in design to overcome animal welfare related trade-offs : The dust bath unit as an example

Allowing farm animals to have active control and influence over their environment through the expression of intrinsically motivated behaviours contributes to their (positive)welfare. However, farm animals are predominantly seen as passive receivers of what husbandry systems should provide for them. Additionally, designers and engineers of farming systems neglect the animals' potential in the design of husbandry systems, resulting in disadvantageous trade-offs between animal welfare and economic and environmental sustainability aspects. This paper describes, through the application of an interactive structured design approach, how laying hens can actively contribute to the functioning of the husbandry system by exercising their own goals. The ambition of this research was to allow animals to contribute to creating opportunities that might overcome existing trade-offs between animal welfare and other sustainability goals. The Reflexive Interactive Design approach was applied to achieve this ambition. This paper presents the methodological steps of the design process to contribute to the reduction of the (fine) dust problem in laying hen husbandry using the dust bath unit as an example. Also, this paper describes how we incorporated the laying hen as a contributor in the design process. We show that facilitating intrinsically motivated laying hen dust bathing behaviour can simultaneously resolve the environmental dust problem experienced in loose housing systems.</p

Anaerobic Conversion of Lactic Acid to Acetic Acid and 1,2-Propanediol by Lactobacillus buchneri

The degradation of lactic acid under anoxic conditions was studied in several strains of Lactobacillus buchneri and in close relatives such as Lactobacillus parabuchneri, Lactobacillus kefir, and Lactobacillus hilgardii. Of these lactobacilli, L. buchneri and L. parabuchneri were able to degrade lactic acid under anoxic conditions, without requiring an external electron acceptor. Each mole of lactic acid was converted into approximately 0.5 mol of acetic acid, 0.5 mol of 1,2-propanediol, and traces of ethanol. Based on stoichiometry studies and the high levels of NAD-linked 1,2-propanediol-dependent oxidoreductase (530 to 790 nmol min(−1) mg of protein(−1)), a novel pathway for anaerobic lactic acid degradation is proposed. The anaerobic degradation of lactic acid by L. buchneri does not support cell growth and is pH dependent. Acidic conditions are needed to induce the lactic-acid-degrading capacity of the cells and to maintain the lactic-acid-degrading activity. At a pH above 5.8 hardly any lactic acid degradation was observed. The exact function of anaerobic lactic acid degradation by L. buchneri is not certain, but some results indicate that it plays a role in maintaining cell viability