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Esterified-Glucomannan in Broiler Chicken Diets-Contaminated with Aflatoxin, Ochratoxin and T-2 Toxin: Evaluation of its Binding Ability (in vitro) and Efficacy as Immunomodulator

  • Raju, M.V.L.N. (Department of Poultry Science, University of Agricultural Sciences) ;
  • Devegowda, G. (Department of Poultry Science, University of Agricultural Sciences)
  • Received : 2001.06.20
  • Accepted : 2002.02.19
  • Published : 2002.07.01

Abstract

In vitro binding efficacy of esterified glucomannan (E-GM) (0.1%) on aflatoxin B1 (AF) (300 ppb), ochratoxin A (OA) (2 ppm) and T-2 toxin (T-2) (3 ppm), when present alone or in combination, was evaluated in toxin-contaminated feed at pH 4.5 and 6.5. Esterified glucomannan showed significantly (p<0.01) higher binding with AF (81.6%), whereas those recorded with T-2 (27.8%) and OA (25.6%) were moderate. Binding of each toxin decreased as the number of toxins in feed increased. pH of medium showed no effect on mycotoxin binding ability of E-GM. A $2{\times}2{\times}2{\times}2$ factorial experiment of 5 week duration was conducted to study the effects of two dietary levels each of AF (0 and 300 ppb), OA (0 and 2 ppm), T-2 (0 and 3 ppm ) and E-GM (0 and 0.1%) on the immune competence of a total of 960 day-old commercial broilers. Reductions in size of thymus (by AF and T-2) and bursa (by AF) and antibody titers against Newcastle disease and Infectious Bursal disease (by all the toxins) were noted. Additive and antagonistic interactions were seen among the toxins on certain parameters. Esterified glucomannan significantly (p<0.01) improved antibody titers and weights of bursa ofFabricius and thymus indicating its counteracting efficacy against immunosuppression in mycotoxicosis of multiple origin.

Keywords

Esterified-Glucomannan;Aflatoxin;Ochratoxin;T-2 Toxin;Broilers

Acknowledgement

Supported by : M/S Alltech Inc., USA and Indian Council of Agricultural Research, New Delhi

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