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Grazing Sheep in Organic Vineyards: An On‐Farm Study about Risk of Chronic Copper Poisoning

Trouillard, Martin; Lèbre, Amélie and Heckendorn, Felix (2021) Grazing Sheep in Organic Vineyards: An On‐Farm Study about Risk of Chronic Copper Poisoning. Sustauinability, 132 (2860), pp. 1-13.

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Document available online at: https://www.mdpi.com/2071-1050/13/22/12860


Summary

Many winegrowers and sheep breeders are interested in wintertime grazing in vineyards, as an agroecological alternative to mowing or herbicide spraying, and additional supply of forage.
Still, strong concern is raised by the use of copper‐based fungicides, particularly in organic vineyards, since copper is known to induce chronic toxicosis in sheep. We conducted an on‐farm study with n = 12 1‐year‐old Merinos × Mourerous ewes grazing the cover vegetation of vineyard plots during wintertime, in order to check whether this agricultural practice might be harmful to sheep.
Our results indicate that most copper found in the cover vegetation originates from fungicide spraying versus plant uptake from the soil, and that rain‐induced washing‐off and plant growth‐triggered dilution of copper are crucial to reach close‐to‐safe grazing conditions. Furthermore, we found that while sheep remained globally healthy during the 2 months of the experimental period, the plasma activity of Glutamate Dehydrogenase increased by 17.3 ± 3.0 U/L upon vineyard grazing (p < 0.001), reflecting liver storage of copper. We also discovered that the dynamics of molybdenum in sheep plasma are strongly affected by exposure to copper, suggesting a possible adaptation mechanism.
Overall, our results suggest that winter grazing of sheep in organic vineyards is reasonably safe, but that care should be taken about grazing period duration. More research should be conducted with respect to long‐term copper accumulation, spring and summer grazing, and possible protective mechanisms against copper chronic poisoning.


EPrint Type:Journal paper
Keywords:copper, sheep, vineyards, winegrowing, molybdenum, agroforestry, crop-livestock integration
Agrovoc keywords:
Language
Value
URI
English
copper
http://aims.fao.org/aos/agrovoc/c_1868
English
sheep
http://aims.fao.org/aos/agrovoc/c_7030
English
vineyards
http://aims.fao.org/aos/agrovoc/c_15203
English
agroforestry
http://aims.fao.org/aos/agrovoc/c_207
Subjects: Animal husbandry > Production systems > Sheep and goats
Animal husbandry > Health and welfare
Crop husbandry > Production systems > Fruit and berries > Viticulture
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Animal > Animal health
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Animal > Small ruminants
France > FiBL France
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Crops > Special crops > Winegrowing
DOI:10.3390/su132212860
Deposited By: Forschungsinstitut für biologischen Landbau, FiBL
ID Code:43754
Deposited On:17 Feb 2022 08:23
Last Modified:18 Feb 2022 08:11
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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