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This article in CS

  1. Vol. 11 No. 2, p. 231-233
    Received: Aug 31, 1970

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Relationship Between Tannin Levels and Nutritive Value of Sericea1

  1. W. A. Cope and
  2. J. C. Burns2



One low-tannin sericea synthetic strain (Lespedeza cuneata (Dumont) G. Don) was compared with high-tannin strains over different years, harvests, and test locations for in vitro dry matter disappearance (IVDMD). Concentrations of fiber and lignin were determined for representative samples of both low-tannin and high-tannin strains. Increments of a water-soluble purified tannin fraction, “sericin,” were added to samples of one lowtannin and one high-tannin strain for IVDMD analysis. The low-tannin strain was consistently about 25% higher in IVDMD than high-tannin sericea over years, harvests, and locations where mean values varied widely. There were only small differences among high-tannin strains for IVDMD. The low-tannin strain was quite similar to two high-tannin strains in fiber and lignin concentrations. The results strongly support the conclusion that tannin was the cause of IVDMD difference between lowand high-tannin genotypes. IVDMD of both low- and high-tannin sericea decreased progressively with added increments of sericin. Both tannin and sericin were effective in limiting the IVDMD of sericea forage.

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