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Home / Equine Research Bank / Animals (Basel) / Summer Diet of Horses (Equus ferus caballus Linn.), Guanacos...
Animals : an open access journal from MDPI2021; 11(5); 1313; doi: 10.3390/ani11051313

Summer Diet of Horses (Equus ferus caballus Linn.), Guanacos (Lama guanicoe Müller), and European Brown Hares (Lepus europaeus Pallas) in the High Andean Range of the Coquimbo Region, Chile.

Abstract: For an adequate management of natural grasslands, the knowledge and understanding of the dietary habits of herbivores and their trophic interactions are fundamental. During two summer seasons, in a mountain range of a sector of the Coquimbo Region, Chile, the botanical composition, diversity, and similarity of the diets of horses, European brown hares, and guanacos were studied, as was the selectivity of the main grassland plant species, using feces microhistology. The contribution of hydromorphic grasses was similar in the diets of guanacos (35.90 ± 7.27%) and horses (32.25 ± 4.50%), differing from that found in hares (16.32 ± 5.32%). Dryland grassland grasses contributed similarly to the diets of horses (13.21 ± 3.22%), guanacos (22.53 ± 5.21%) and hares (18.35 ± 3.81%), as well as graminoids, which averaged 47.79 ± 6.66%, 35.63 ± 10.76% and 38.94 ± 7.88%, in diets of horses, guanacos, and hares, respectively, without significant differences. The contribution of herbaceous dicotyledons was only important in hares (23.76 ± 3.76%), while that of shrubs was low (<3%) and similar among the three herbivores. Dietary diversity was similar among the three herbivore species (73-79%), with a higher degree of dietary overlap between horses and guanacos (55.7%), which was higher than that obtained between hares and guanacos (50%) and between horses and hares (48%), for which there would be a potential trophic competition between them. The most abundant species of dryland and wet grasslands generally fulfill a functional role of subsistence and a nutritional role of maintenance; however, for the three herbivores studied, a different selective behavior was evidenced, according to their physiological differences, with the selection process little affected by the relative abundance of these species in the grasslands. Due to the above, herbivores resort to the selection of certain species that, despite being not very abundant in grasslands, play an important nutritional and functional role, improving the quality of their diets.
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Publication Date: 2021-05-03 PubMed ID: 34063638PubMed Central: PMC8147654DOI: 10.3390/ani11051313Google Scholar: Lookup
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Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The research investigates the dietary habits and similarities of horses, European brown hares, and guanacos residing in the mountain range of the Coquimbo Region, Chile during summer seasons. It finds that all three herbivores have different preferences and selective behaviors in choosing their feed due to their physiological differences, and that they select certain low-abundance species for their significant nutritive role in improving the quality of their diets.

Dietary Habits and Similarities

  • The research was conducted during two summer seasons in a mountain range of the Coquimbo Region, Chile.
  • The diets of horses, European brown hares, and guanacos were studied in terms of botanical composition, diversity, and similarity.
  • The study further focused on determining the selectivity of the three herbivores towards major grassland plant species.

Grass and Plant Consumption

  • Horses and guanacos had similar hydromorphic grass contributions, unlike hares.
  • All three herbivores consumed roughly comparable amounts of dryland grassland and graminoids, with no significant evidence of differential consumptions.
  • Hares were primarily dependent on herbaceous dicotyledons, whereas the contribution of shrubs in all three diets was low.

Diversity and Overlaps in Diets

  • The dietary diversity was fairly consistent for all three species (around 73-79%).
  • There was a higher degree of dietary overlap observed between horses and guanacos (55.7%) than there was between the duos of horses and hares (48%) and hares and guanacos (50%), thus implying potential trophic competition between these animals.

Nutrition and Selection of Food

  • The most abundant plant and grass species provided basic nutrition and survival sustenance to the herbivores.
  • However, the study found that each herbivore had different selective behavior while feeding, influenced by their unique physiological attributes.
  • Despite the relative abundance of these species in the grasslands affecting their selection, all three herbivores showed a preference for specific, low-abundance species, emphasizing the importance of these species for providing a balanced diet and nutritional function.

Cite This Article

APA
Castellaro G, Orellana CL, Escanilla JP. (2021). Summer Diet of Horses (Equus ferus caballus Linn.), Guanacos (Lama guanicoe Müller), and European Brown Hares (Lepus europaeus Pallas) in the High Andean Range of the Coquimbo Region, Chile. Animals (Basel), 11(5), 1313. https://doi.org/10.3390/ani11051313

Publication

Animals : an open access journal from MDPI
ISSN: 2076-2615
NlmUniqueID: 101635614
Country: Switzerland
Language: English
Volume: 11
Issue: 5
PII: 1313

Researcher Affiliations

Castellaro, Giorgio
  • Faculty of Agriculture Sciences, University of Chile, Santiago 8820808, Chile.
Orellana, Carla Loreto
  • Faculty of Agriculture Sciences, University of Chile, Santiago 8820808, Chile.
Escanilla, Juan Pablo
  • Faculty of Agriculture Sciences, University of Chile, Santiago 8820808, Chile.

Conflict of Interest Statement

The authors declare no conflict of interest.

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Citations

This article has been cited 1 times.
  1. Freschi P, Fascetti S, Riga F, Rizzardini G, Fortebraccio M, Ragni M, Paolino R, Cosentino C. Diet Selection by the Italian Hare (Lepus corsicanus de Winton, 1898) in Two Protected Coastal Areas of Latium.. Animals (Basel) 2022 Mar 9;12(6).
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