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Effect of forage condensed tannins on gastro-intestinal parasite infection in grazing wether goats

B. R. Min1, W. Pomroy2, S. P. Hart1, and T. Sahlu1

1E (Kika) de la Garza Institute for Goat Research, Langston University, Langston, OK
2Veterinary and Biomedical Science, Massey University, Palmerston North, New Zealand

The objective of this study was to evaluate effects of dietary condensed tannins (CT) in Sericea lespedeza (SL; Lespedeza cuneata; 4.6% extractable CT/kg DM) on total fecal egg output (TFEO; eggs/d) and stage of larvae development compared with non-CT-containing forage (rye/crabgrass (RC); 0.6 g extractable CT/kg DM) in grazing wether goats. A grazing trial (cross over) involving 11 naturally parasite-infected (>1,200 eggs/g) goats (47 3.3 BW) were randomly selected 1 mo after Ivermectin treatment (0.2 mg/kg BW) failure. Larval culture of pre-treatment feces showed that 86-97% of larvae were Haemoncus, with the remainder being Trichostrognylus and Ostertagia. Periods lasted 15 d, with fecal samples taken on d 0, 5, and 15. The number of eggs/g feces were determined by a modification of the McMaster technique. Larvae were cultured for 10 d at 27oC by placing 20 g of fresh feces inside a small glass container within a larger container holding free water (20 ml) to maximize humidity. Larvae were collected using a modified Baermann's procedure and counted. Mean fecal egg counts (2,722 vs 1,162 eggs/g) and TFEO (173 vs 45 x 104 eggs/d) were lower (P < 0.01) for RC vs SL. Larvae development from eggs to infective stage of larvae (L3) by 15 d was 88% (3,432 vs 421 larvael/20 g feces; P < 0.001) lower for RC vs SL. In conclusion, CT in forages such as SL may reduce pasture contamination with infective larvae and be a valuable tool for parasite control.


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