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Upcycling food leftovers and grass recources through farm animals

Van Hal, O.; de Boer, I.J.M.; Müller, A.; de Vries, S.; Erb, K.; Schader, C. and Van Zanten, H.H.E. (2019) Upcycling food leftovers and grass recources through farm animals. In: Book of Abstracts of the 70th Annual Meeting of the European Federation of Animal Science, 26 - 30 August 2019, Ghent, Belgium (25), p. 316.

[thumbnail of VanHal-etal-2019-JofCleanerProduction-Vol219-p485-496.pdf] PDF - English
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Document available online at: https://research.wur.nl/en/publications/upcycling-food-leftovers-and-grass-recources-through-farm-animals


Consumption of animal-source food is criticised, among other reasons, for its relatively high environmental impact. It is, however, increasingly acknowledged that livestock can contribute to nutrition security if they upcycle low-opportunity-cost feed (LCF) e food waste, food processing by-products and grass resources e into nutritious animal source food. So far, however, no study explored the allocation question “to which livestock should we feed what LCF to maximise livestock's contribution to human nutrition”. Here we optimise the use of the LCF available in the EU, using a model that assigns LCF to those livestock systems that maximise animal protein production. We included the five most common livestock systems in the EU e pigs, laying hens, broilers, dairy cattle and beef cattle e considering their nutrient requirements under three productivity levels (low, mid and high). LCF availability is based on current food supply combined with food wastage and food processing data, and current grassland productivity.
Our results showed that optimal conversion of LCF available in the EU, could supply 31 g animal protein per EU capita per day. We confirmed that this optimal conversion requires a variety of both livestock systems and productivity levels. Dominant livestock systems were those that have a high conversion efficiency (laying hens, dairy cattle), were best able to valorise specific LCF (dairy cattle for grass; pigs for food waste), and could valorise low quality LCF because of their low productivity. Limiting the model to use only conventional, high productive, livestock reduced animal protein supply by 16% to 26 g/(cap*d). Besides the efficiency with which livestock used the available LCF, the estimated protein supply from livestock fed solely on LCF, was sensitive to assumptions regarding the availability and quality of LCF, especially grass resources. Our model provides valuable insights into how livestock can efficiently use LCF, which is essential for a transition towards a circular food system.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:animal health, food leftover, grass recources, livestock systems
Subjects: Animal husbandry > Feeding and growth
Animal husbandry > Health and welfare
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Society > Agri-food policy
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Sustainability
Switzerland > Other organizations
Related Links:https://www.wageningenacademic.com/doi/pdf/10.3920/978-90-8686-890-2
Deposited By: Schader, Dr. Christian
ID Code:37350
Deposited On:27 Feb 2020 08:21
Last Modified:15 Mar 2022 08:11
Document Language:English
Refereed:Peer-reviewed and accepted

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