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Nutritive value and condensed tannins of tree legumes in silvopasture systems. | LitMetric

AI Article Synopsis

  • Introducing arboreal legumes like gliricidia and mimosa to tropical pastures can improve sustainability, but they come with management challenges due to their high condensed tannin (CT) levels, which affect forage quality.
  • * The study examined how CT content and forage quality of these legumes vary throughout the year, revealing that mimosa has higher CT levels than gliricidia, especially at the start of the dry season.
  • * Results showed that while both legumes' CT decreased during the dry season, this reduction correlated with lower forage quality of C4 grasses, making legumes a potentially beneficial supplement when grass quality declines.

Article Abstract

Introducing legumes into C4-dominated tropical pastures, may enhance their sustainability but has some pasture management constraints. One potential alternative is using arboreal legumes, but several of these species have relatively high condensed tannin (CT) concentrations, which negatively impact forage quality. There is limited knowledge, however, on how arboreal legume leaf CT content varies over the year and how this might impact forage quality. The objective of this 2 year study was to assess the seasonal variation of CT and nutritive value for ruminants of the tropical tree legumes gliricidia [Gliricidia sepium (Jacq.) Kunth ex. Walp.] and mimosa (Mimosa caesalpiniifolia Benth). The research was carried out in the sub-humid tropical region of Brazil on well-established pastures in which either legume was present with signalgrass (Urochloa decumbens Stapf.). We determined CT and nitrogen concentrations, in vitro digestible organic matter (IVDOM), and leaf δ13C and δ15N from January to October of 2017 and 2018. All parameters were affected (P < 0.05) by the interaction between legume species and sampling time, with generally higher leaf CT content for mimosa than gliricidia, and both were reduced at the start of the dry season, although much more drastically for mimosa. The IVDOM was strongly affected by CT content and increased at the start of the dry season, coincidentally when C4 grass forage quality typically decreased. There is a marked species effect, with CT from gliricidia impacting IVDOM more than the same CT content from mimosa. While N concentration from mimosa also increased at the start of the dry season, that for gliricidia did not vary over the year. We conclude that although these arboreal legumes have relatively high CT contents, these reduce during the dry season when CT concentrations coinciding with a reduced forage quality as the protein content for C4 grasses is usually inadequate in this season.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11300605PMC
http://dx.doi.org/10.1038/s41598-024-68563-9DOI Listing

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