Effect of Tannin-Binding Agents (Polyethylene Glycol and Polyvinylpyrrolidone) Supplementation on In Vitro Gas Production Kinetics of Some Grape Yield Byproducts

Table 1

The chemical composition of feeds (g/kg DM)^a.

Feeds	DM	CP	NDF	ADF	Crude fat	OM	Total phenols	Total tannins
Grape pomace	933	66.2	187	184	14.1	877	30.1	22.7
Raisin waste	916	62.4	280	276	12.3	927.7	96.3	72.1
Dried grape byproduct	884.5	63.5	259	255	11.2	926	67	52.3

^aDM: dry matter, CP: crude protein, NDF: neutral detergent fiber, ADF: acid detergent fiber, and OM: organic matter.