2005•Proceedings of the British Society of Animal ScienceRequires access
Bioassay for measuring tannin effects based on gas production technique. 2. Dosage of polyethylene glycol
Ives Cláudio da Silva Bueno, S.L.S. Cabral Filho, E.F. Nozella, M.R.S.R. Peçanha, A.P. Minho, Dorinha Miriam Silber Schmidt Vitti, Adibe Luiz Abdalla, Hélder Louvandini
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Abstract
Tannins are secondary compounds that can bind protein and other nutrients and reduce their availability to the animals. Polyethylene glycol (PEG) has a great affinity with tannins and when it is added to the feed it is bound to tannins and releases the protein and other nutrients. There is no information about the amount of PEG that is needed to obtain the maximum precipitation of tannin and the minimum tannin effect. Some assays are conduced using doses of PEG according to the tannin content, but the activity of tannins can vary and this imply that the tannin analysis has to be done prior. The aim of this work was to evaluate doses of polyethylene glycol to minimize the effect of tannins on rumen fermentation.