Effects of Plant Tannin Extracts Supplementation on Animal Performance and Gastrointestinal Parasites Infestation in Steers Grazing Winter Wheat
Open Journal of Animal Sciences
Twenty-six stocker cattle (286.1 ± 25.7 kg) were used to quantify the effect of commercial plant tannin extracts (control vs. mimosa and chestnut tannins) on animal performance, gastrointestinal parasites control and plasma metabolite changes in heifers grazing winter wheat forage (Triticum aestivum L. var. "cutter"). The forage biomass and crude protein content were generally similar among treatments. Initial live-weight (LW) was similar among treatments, although final LW (P = 0.1) and
... P = 0.1) and average daily gain (ADG; P < 0.01) differed. Logarithmic (log) fecal egg counts (FEC) for Haemonchus contortus was higher (P < 0.02) for mimosa tannins group than for control group, and chestnut tannins group was intermediate in cattle grazing wheat forage on day 35. Logarithmic FEC for Ostertagia was lower (P < 0.05) for chestnut tannins group than for both control and mimosa tannins group on day 41. However, log FEC for Cooperia was lower (P < 0.04) for mimosa tannins than for both control and chestnut tannins group. Blood parameters were similar among treatments, except cholesterol level on day 70. Blood cholesterol level was higher (P < 0.02) for chestnut tannins group than for control, and intermediate for mimosa tannins. However, choles-* Corresponding author. B. R. Min et al. 344 terol level was similar among treatment after 20 days cessation of tannins treatments. Our data suggest that heifers grazing winter wheat forage supplemented with plant tannins rather than control (non-tannins group) increased ADG (8% to 19%) for mimosa and chestnut tannins groups, respectively with no detectable detrimental effects on animal health. The increase in ADG may be due to decrease fecal parasites infections.