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

Table 5

Statistical comparison within the parameters estimated from the gas production in grape yield byproducts.

Treatments	Estimated parameters
	a + b	c	ME	OMD	NEl	VFA
Control
DGB	239.43^b	0.0992^b	11.63^b	55.41^b	0.367^b	0.924^b
GP	263.49^a	0.1073^a	12.40^a	59.85^a	0.406^a	1.024^a
RW	208.22^c	0.0976^c	10.79^c	50.32^c	0.367^b	0.799^c
SEM	0.0299	0.00017	0.066	0.431	0.001	0.011
Byproducts + PEG
DGB	280.59^b	0.0939^b	12.51^b	61.22^b	0.379^b	1.069^b
GP	317.03^a	0.0921^c	13.66^a	68.05^a	0.423^a	1.229^a
RW	235.86^c	0.1081^a	11.43^c	54.50^c	0.376^b	0.903^c
SEM	0.0751	0.00013	0.141	0.924	0.002	0.023
Byproducts + PVP
DGB	252.24^b	0.0966^b	11.87^b	57.03^b	0.370^b	0.965^b
GP	314.12^a	0.0972^b	13.62^a	67.82^a	0.422^a	1.223^a
RW	235.66^c	0.1028^a	11.49^b	54.89^b	0.376^b	0.913^b
SEM	0.14304	0.00022	0.136	0.981	0.002	0.022

GP: grape pomace, RW: raisin waste, DGB: dried grape pomace, ME: metabolizable energy (MJ/kg DM), OMD: organic matter digestibility (g/100 g DM), NE_l: net energy for lactation (Mcal/lb), VFA: volatile fatty acids (mmol), (a + b): potential gas production (mL/g DM) and c: rate constant of gas production during incubation (mL/h).
^a,b,cWithin a column, means without a common superscript letter differ (𝑃<0.05).