Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 549868
Title Nitrogen flows in global pork supply chains and potential improvement from feeding swill to pigs
Author(s) Uwizeye, Aimable; Gerber, Pierre J.; Opio, Carolyn I.; Tempio, Giuseppe; Mottet, Anne; Makkar, Harinder P.S.; Falcucci, Alessandra; Steinfeld, Henning; Boer, Imke J.M. de
Source Resources, Conservation and Recycling 146 (2019). - ISSN 0921-3449 - p. 168 - 179.
DOI https://doi.org/10.1016/j.resconrec.2019.03.032
Department(s) Animal Production Systems
WIAS
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) Animal production - Food wastes - Life cycle - Livestock - Nitrogen use efficiency
Abstract

The global pork sector contributes to food security and supports livelihoods for millions of households but also causes nitrogen (N) pollution. Here we assess N flows, losses, and N use indicators for global pork supply chains, from “cradle-to-primary-processing-gate” and for three production systems: the backyard, intermediate and industrial systems. Subsequently, we evaluate the effects of feeding swill to industrial pigs on N flows and land use. To produce 3.5 Tg N of pork globally, 14.7 Tg N are lost into the environment, of which 68% is lost to watercourses in the form of nitrates and organic N and the reminder emitted to the atmosphere as N-gas (e.g., NH 3 , NOx and N2O). We found that the efficiency of N use, hotspot and magnitude of N losses per unit of area depend chiefly on the region (agro-ecological and economic context), origin of feed, and manure management systems. Swill feeding increases N use efficiency and reduces N losses at the feed production stage. It achieves a saving of 31 Mt of soybeans and 20 Mt of grains on dry matter basis, equivalent to 16 M ha of land used. Its adoption would require innovative policies to preserve food safety and public health. Future research may explore the feasibility and requirements to adopt swill feeding at a country level and may investigate potential impacts on other sustainability objectives.

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