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Zinc excretion from weaned pigs relates to zinc intake: a meta-analysis

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Several studies have shown that a high dietary zinc (Zn) content in pig diets leads to a high faecal Zn excretion, which is considered an environmental issue. However, there is limited knowledge about the relation between Zn intake and
faecal Zn excretion in newly weaned pigs. Therefore, we performed a literature search for peer-reviewed experiments, where different dietary Zn levels were provided to pigs the first three weeks post-weaning and daily Zn intake and
faecal excretion measured in mg/d. The meta-analysis included six studies with different dietary Zn sources and levels (49 data points in total). The statistical analysis showed a linear relationship between daily Zn intake and Zn excretion
in faeces, uninfluenced by the Zn source. During the first week post-weaning, the linear relationship showed a slope of 0.18 (P<0.01, R2=0.95), which was significantly lower than the slope for the second and third week post-weaning. The positive linear relationship between the Zn intake and the Zn excretion in faeces in the second and third weeks were similar, with a slope of 0.84 (P<0.01, R2=0.94). Based on these results, the daily faecal excretion of Zn appears to be
lower at a given Zn intake the first week post-weaning, indicating a higher Zn uptake compared with the following two weeks post-weaning. We applied the identified linear relationships between daily Zn intake and faecal Zn excretion
during week 1 and 2-3 post-weaning on our own data of daily Zn intake in 180 pigs distributed to six different doses of total Zn in the diet (155, 492, 1,024, 1,604, 2,056, or 2,419 ppm) the first 3 weeks post-weaning. The calculated
average daily excretion of Zn during week 1 post-weaning was between 0 and 47 mg/d/pig. The excretion increased during week 2-3 to between 143 and 1,651 mg/d/pig depending on the Zn intake. This shows the calculated daily
Zn excretion is up to 35 times higher in week 2-3 compared to week 1 post-weaning. Moreover, the Zn excretion in week 2-3 is about 11 times higher when the diet contains 2,419 compared to 155 ppm Zn. Overall, the results of this
meta-analysis can be used to estimate the daily Zn excretion from pigs the first three weeks post-weaning when the daily Zn intake is known.
Original languageEnglish
Title of host publicationBook of Abstracts of the 72nd Annual Meeting of the European Federation of Animal Science
EditorsE. Strandberg, L. Pinotti, S. Messori, D. Kenny, M. Lee, J.F. Hocquette, V.A.P. Cadavez, S. Millet, R. Evans, T. Veldkamp, M. Pastell, G. Pollott
Number of pages1
PublisherWageningen Academic Publishers
Publication yearAug 2021
ISBN (print)978-90-8686-366-2
ISBN (Electronic)978-90-8686-918-3
Publication statusPublished - Aug 2021
Event72nd Annual Meeting of the European Federation of Animal Science - Congress Centre Davos, Davos, Switzerland
Duration: 29 Aug 20213 Sept 2021


Conference72nd Annual Meeting of the European Federation of Animal Science
LocationCongress Centre Davos
SeriesEAAP Book of Abstracts

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