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Forage Preservation Method Influences on Tannin Concentration, Intake, and Digestibility of Sericea Lespedeza by Sheep

Dep. of Agronomy, Univ. of Georgia, Athens, GA 30602
USDA-ARS Plant Structure and Composition Res. Unit, Athens, GA 30613
Dep. of Agronomy, Univ. of Georgia, Athens, GA 30602
Dep. of Animal and Dairy Sci., Univ. of Georgia, Athens, GA 30602

^* Corresponding author.

Livestock do not like to graze high-tannin (HT) sericea lespedeza [Lespedeza cuneata (Dum-Cours) G. Don], but readily consume it as hay. Intake and digestibility of fresh-frozen (FF) and field-dried (FD) HT and low-tannin (LT) sericea were studied in a feeding trial with sheep (Ovis spp.) in a 2 x 2 factorial with a 4 x 4 Latin square arrangement of treatments. Tannin concentrations were 181,87,31, and 44 g kg^-1 for HT-FF, LT-FF, HT-FD, and LT-FD sericea, respectively. There was no difference in digestibility due to preservation method, but HT-FF was less digestible than LT-FF [forage x preservation method (P < 0.05)]. Digestibility of neutral detergent fiber, acid detergent fiber, hemicellulose, cellulose, lignin, N, neutral detergent insoluble N, acid detergent insoluble N (ADIN), and intake of HT-FF sericea were lower than LT-FF or the FD forages. Decreased intake and digestibility of HT-FF sericea were related to the high tannin concentration. Elevated fecal recovery of lignin and ADIN in sheep fed HT-FF forage resulted in negative digestibilities and may be related to formation of insoluble tannin-protein complexes in the digestive tract. Field drying decreased analyzable tannin concentration in HT sericea.

Received for publication March 21, 1988.

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