Influence of main dietary chemical constituents on the in vitro gas and methane production in diets for dairy cows

Table 1 Feed ingredients, chemical composition and gross energy content of seven diets

	Reference	Low NDF	High NDF	Low CP	High CP	Low Lipid	High Lipid
Ingredients, g/kg DM
Corn silage	351	430	–	375	281	351	351
Alfalfa hay	89	23	134	66	156	89	89
Ryegrass hay	47	–	231	43	52	47	56
Meadow hay	47	–	227	47	52	47	60
Corn grain	205	228	152	258	147	218	160
Barley grain	119	171	92	160	90	122	100
Soybean meal, (sol. extr., 44)	113	119	126	27	188	126	18
Whole soybean seeds, cracked	–	–	–	–	–	–	68
Extruded soybean seeds	–	–	–	–	–	–	68
Extruded flaxseed seeds	29	29	38	24	34	–	29
Chemical composition, g/kg DM
Crude protein (CP)	158	152	161	115	194	161	158
Starch	273	273	100	332	176	265	233
NDF	361	325	435	358	357	359	360
Hemicellulose	169	171	189	172	158	171	169
ADF	192	154	246	186	199	188	191
Cellulose	163	134	203	160	167	163	163
Lignin_(sa)	29	20	43	26	32	25	28
NFC^a	395	443	302	446	357	402	367
Ether extract	33	34	38	34	34	26	61
Ash	53	46	64	47	58	52	54
Gross energy, MJ/kg DM^b	16.8	16.9	17.3	16.8	17.3	16.5	16.7

ISSN: 2049-1891