Parasite dilution improves lamb growth more than does the complementarity of forage niches in a mesic pasture grazed by sheep and cattle
Agroecological practices can improve the functioning of livestock farming systems by optimizing their underlying biological processes. Sheep/cattle mixed-grazing is an example of such a practice in which sheep grazing with cattle can achieve a higher liveweight gain (LWG), than sheep grazing alone....
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-12-01
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| Series: | Frontiers in Animal Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fanim.2022.997815/full |
| _version_ | 1811177860189126656 |
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| author | Frédéric Joly Priscilla Note Marc Barbet Philippe Jacquiet Sandrine Faure Marc Benoit Bertrand Dumont |
| author_facet | Frédéric Joly Priscilla Note Marc Barbet Philippe Jacquiet Sandrine Faure Marc Benoit Bertrand Dumont |
| author_sort | Frédéric Joly |
| collection | DOAJ |
| description | Agroecological practices can improve the functioning of livestock farming systems by optimizing their underlying biological processes. Sheep/cattle mixed-grazing is an example of such a practice in which sheep grazing with cattle can achieve a higher liveweight gain (LWG), than sheep grazing alone. We conducted an experiment to assess the relative roles of parasite dilution and forage niche complementarity in improving sheep LWGs. We used continuous grazing and compared the LWGs of 5- to 9-month ewe lambs, grazing alone or with heifers, at two contrasting sheep/cattle ratios (~50/50% and 20/80% in livestock units). The animals were not treated for strongyles (gastrointestinal parasites) before or during the experiment. We assessed parasitism by counting the number of strongyle eggs excreted per gram of feces (EPG) and evaluated the forage niche complementarity through observations of feeding behavior, combined with measurements of fecal nitrogen content (N). We observed that i) the diet was moderately improved by mixed-grazing (+4% of dicots and +11% of young vegetative grass at most, but these improvement were not statistically significant (resp. P=0.28 and P=0.35); ii) N levels were not significantly different across treatments (~2%; P=0.75); iii) EPGs were ~50% lower for mixed-grazing than for monospecific grazing (545 and 716 vs. 1278, P<0.01), iv) LWGs were much higher for mixed-grazing than for monospecific grazing (~40 g per day higher, P<0.001); and v) LWGs and EPGs did not significantly differ between the two sheep/cattle ratios studied (resp. P=0.91 and P=0.56). We thus attributed most of the improved ewe lamb LWGs in our experiment to parasite dilution rather than to forage niche complementarity. In addition, the similar EPGs and LWGs observed in mixed-grazing suggest that the benefits of this practice can be obtained easily, i.e. over a wide range of sheep/cattle ratios. Based on the definition of the adjective operable (‘capable of being put into use, operation or practice’), we also conclude that mixed-grazing seems an operable practice from a biological viewpoint. |
| first_indexed | 2024-04-11T06:08:24Z |
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| id | doaj.art-371073f5db4e41a9915262ddf8c788eb |
| institution | Directory Open Access Journal |
| issn | 2673-6225 |
| language | English |
| last_indexed | 2024-04-11T06:08:24Z |
| publishDate | 2022-12-01 |
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| spelling | doaj.art-371073f5db4e41a9915262ddf8c788eb2022-12-22T04:41:23ZengFrontiers Media S.A.Frontiers in Animal Science2673-62252022-12-01310.3389/fanim.2022.997815997815Parasite dilution improves lamb growth more than does the complementarity of forage niches in a mesic pasture grazed by sheep and cattleFrédéric Joly0Priscilla Note1Marc Barbet2Philippe Jacquiet3Sandrine Faure4Marc Benoit5Bertrand Dumont6Université Clermont Auvergne, INRAE, Vetagro Sup, UMR Herbivores, Saint-Genès-Champanelle, FranceINRAE, UE Herbipôle, Laqueuille, FranceINRAE, UE Herbipôle, Laqueuille, FranceIHAP, UMT Pilotage de la Santé des Ruminants, Université de Toulouse, INRAE, ENVT, Toulouse, FranceUniversité Clermont Auvergne, INRAE, Vetagro Sup, UMR Herbivores, Saint-Genès-Champanelle, FranceUniversité Clermont Auvergne, INRAE, Vetagro Sup, UMR Herbivores, Saint-Genès-Champanelle, FranceUniversité Clermont Auvergne, INRAE, Vetagro Sup, UMR Herbivores, Saint-Genès-Champanelle, FranceAgroecological practices can improve the functioning of livestock farming systems by optimizing their underlying biological processes. Sheep/cattle mixed-grazing is an example of such a practice in which sheep grazing with cattle can achieve a higher liveweight gain (LWG), than sheep grazing alone. We conducted an experiment to assess the relative roles of parasite dilution and forage niche complementarity in improving sheep LWGs. We used continuous grazing and compared the LWGs of 5- to 9-month ewe lambs, grazing alone or with heifers, at two contrasting sheep/cattle ratios (~50/50% and 20/80% in livestock units). The animals were not treated for strongyles (gastrointestinal parasites) before or during the experiment. We assessed parasitism by counting the number of strongyle eggs excreted per gram of feces (EPG) and evaluated the forage niche complementarity through observations of feeding behavior, combined with measurements of fecal nitrogen content (N). We observed that i) the diet was moderately improved by mixed-grazing (+4% of dicots and +11% of young vegetative grass at most, but these improvement were not statistically significant (resp. P=0.28 and P=0.35); ii) N levels were not significantly different across treatments (~2%; P=0.75); iii) EPGs were ~50% lower for mixed-grazing than for monospecific grazing (545 and 716 vs. 1278, P<0.01), iv) LWGs were much higher for mixed-grazing than for monospecific grazing (~40 g per day higher, P<0.001); and v) LWGs and EPGs did not significantly differ between the two sheep/cattle ratios studied (resp. P=0.91 and P=0.56). We thus attributed most of the improved ewe lamb LWGs in our experiment to parasite dilution rather than to forage niche complementarity. In addition, the similar EPGs and LWGs observed in mixed-grazing suggest that the benefits of this practice can be obtained easily, i.e. over a wide range of sheep/cattle ratios. Based on the definition of the adjective operable (‘capable of being put into use, operation or practice’), we also conclude that mixed-grazing seems an operable practice from a biological viewpoint.https://www.frontiersin.org/articles/10.3389/fanim.2022.997815/fullgrasslandhealth managementstrongyle (nematodes)diet selectiondiet quality |
| spellingShingle | Frédéric Joly Priscilla Note Marc Barbet Philippe Jacquiet Sandrine Faure Marc Benoit Bertrand Dumont Parasite dilution improves lamb growth more than does the complementarity of forage niches in a mesic pasture grazed by sheep and cattle Frontiers in Animal Science grassland health management strongyle (nematodes) diet selection diet quality |
| title | Parasite dilution improves lamb growth more than does the complementarity of forage niches in a mesic pasture grazed by sheep and cattle |
| title_full | Parasite dilution improves lamb growth more than does the complementarity of forage niches in a mesic pasture grazed by sheep and cattle |
| title_fullStr | Parasite dilution improves lamb growth more than does the complementarity of forage niches in a mesic pasture grazed by sheep and cattle |
| title_full_unstemmed | Parasite dilution improves lamb growth more than does the complementarity of forage niches in a mesic pasture grazed by sheep and cattle |
| title_short | Parasite dilution improves lamb growth more than does the complementarity of forage niches in a mesic pasture grazed by sheep and cattle |
| title_sort | parasite dilution improves lamb growth more than does the complementarity of forage niches in a mesic pasture grazed by sheep and cattle |
| topic | grassland health management strongyle (nematodes) diet selection diet quality |
| url | https://www.frontiersin.org/articles/10.3389/fanim.2022.997815/full |
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