An increase of 64% TVC (bacteria) and 75% mould concentrations was found in haylage open and left for 4 days. Steaming haylage in the HG600 significantly reduced microbial growth, even after 4 days of being left open.
Proceedings of British Society of Animal Science Conference, Nottingham April 2013 Leggatt, P. and Moore-Colyer, M.J.S2013 The effect of steam treatment on the bacteria yeast and mould concentrations in haylage for horses. P 103.
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Hydration is probably not the first thing that occurs to us approaching winter but as vet Stephanie Davis, DVM points out, it can be a big issue.