Abstract
Freshly pruned grape branches were treated with ozone and sodium hydroxide and the effect of treatments on cell wall chemistry and degradability, was studied. Ozonation was expressed in a dissolution of cell wall (CW) components; lignin and matrix carbohydrates were mainly affected and reduced by 44 and 26% respectively. Notwithstanding, the NaOH treatment in creased the proprotion of total cell wall sugars. The distribution of total sugars in untreated grape branches was: 81.5% in CW and 18.5% in cell solubles. The in vitro digestibility by rumen microorganisms of grape branches organic matter, was low (28%) and was increased by, 111% with ozone, whereas NaOH proved ineffective. Ozone increased the in vitro digestibility of CW-glucose by 174%. The possibility of using grape branches as a raw material for conversion to a ruminant feed is discussed.
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