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Heather (Calluna vulgaris) supplementation does not reduce trapping ability of Duddingtonia flagrans in faeces of Haemonchus contortus infected lambs

Maurer, Veronika; Holinger, Mirjam; Oberhänsli, Thomas; Thüer, Susann; Werne, Steffen; Shepherd, Francesca and Athanasiadou, Spiridoula (2022) Heather (Calluna vulgaris) supplementation does not reduce trapping ability of Duddingtonia flagrans in faeces of Haemonchus contortus infected lambs. Veterinary Parasitology, 302 (109661), pp. 1-8.

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Summary

Infection with gastro-intestinal nematodes (GIN) seriously impairs productivity and health of grazing animals. Due to the considerable rise in anthelmintic resistance and the increasing popularity of organic farming, alternative control strategies will replace or complement traditional anthelmintics. The efficacy of two potential alternatives (i) feeding the tanniferous forage heather (Calluna vulgaris) and (ii) the nematophagous fungus Duddingtonia flagrans (isolate FiBL-DF-P14), was tested in a feeding experiment with lambs artificially infected with Haemonchus contortus. Animals received hay supplemented with heather or with a late cut hay (ecohay) as a control feed ad libitum for three weeks. Two doses (1 × 105 and 5 × 104 chlsp/kg LW) of D. flagrans chlamydospores (chlsp) were administered to animals of each roughage treatment and H. contortus larval recovery from faecal cultures was compared with an untreated control (6 animals per D. flagrans-heather combination). Protein, crude fiber and energy contents of ecohay and heather were similar but heather contained approximately twice more fat, four times more lignin and ten times more of all condensed tannin fractions. Heather contained 17.3 mg Proanthocyanidin per g dry matter (DM) while contents of ecohay were 1.7 mg/g DM. Daily average feed intake across both treatments was 1.5 kg DM/animal/day, of which heather/ecohay intake accounted for 0.17/0.19 kg. Overall, there was no significant effect of heather on faecal egg counts (FEC). There was a tendency for a significant interaction between feed supplement and time and a significantly (p = 0.030) lower FEC of nominally 1799 EPG in the heather treatment at the end of the heather feeding period compared with the ecohay treatment. Lambs in this study consumed less heather than grazing sheep in other studies, even though condensed tannin contents were comparably low. Heather supplementation did not affect larval recovery in faecal cultures and trapping ability of D. flagrans. As compared with the untreated control, both doses of D. flagrans reduced larval recovery by 96.2 % and 95.5 %, respectively (p < 0.001), with no significant difference between the doses. The isolate FiBL-DF-P14 was at least as effective as isolates tested in other studies and achieved over 95 % reduction at a low dosage of 5 × 104 chlsp/kg LW. In conclusion, our results confirm the potential of and indicate no negative interactions between both alternative GIN control methods.


EPrint Type:Journal paper
Keywords:Gastro-intestinal nematodes, Biological control, grazing animals, Nematophagous fungi, Tanniferous forages, Abacus, FiBL2505404
Agrovoc keywords:
Language
Value
URI
English
nematode control
http://aims.fao.org/aos/agrovoc/c_5110
English
biological control
http://aims.fao.org/aos/agrovoc/c_918
Subjects: Animal husbandry
Animal husbandry > Production systems > Sheep and goats
Animal husbandry > Health and welfare
Research affiliation: European Union > Horizon 2020 > RELACS
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Animal > Animal welfare & housing > Grassland-based livestock systems
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Animal > Animal health > Parasitology
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Animal > Small ruminants
UK > Scottish Rural Colleges (SRUC - previously SAC)
Horizon Europe or H2020 Grant Agreement Number:773431
ISSN:0304-4017
DOI:10.1016/j.vetpar.2022.109661
Related Links:https://relacs-project.eu/, https://www.fibl.org/en, https://pure.sruc.ac.uk/
Deposited By: Herforth-Rahmé, Dr. Sc. Joelle
ID Code:43588
Deposited On:07 Feb 2022 15:18
Last Modified:07 Feb 2022 15:18
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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