Long-term and combined effects of N-[2-(nitrooxy)ethyl]-3-pyridinecarboxamide and fumaric acid on methane production, rumen fermentation, and lactation performance in dairy goats

Table 3 Effects of the dietary treatments on the dietary apparent nutrient digestibility and energy balance of the dairy goats

Item	Treatment¹				SEM	P-value
Item	CON	FUM	NPD	FN	SEM	FUM	NPD	F × N
Apparent nutrient digestibility, %
DM	63.8	64.3	63.8	64.0	0.76	0.648	0.792	0.865
NDF	42.0	42.1	41.4	41.9	1.33	0.802	0.777	0.901
ADF	37.7	40.1	38.6	39.5	1.22	0.191	0.900	0.566
CP	82.0	81.8	82.1	81.1	0.56	0.291	0.611	0.497
Energy intake, MJ/d
GE	28.8	28.5	30.6	28.2	1.37	0.355	0.578	0.469
DE	18.7	18.5	19.8	18.3	0.86	0.373	0.591	0.472
ME	16.5	16.3	17.8	16.2	0.76	0.310	0.457	0.400
Energy loss, MJ/d
Faeces	10.1	10.0	10.8	9.9	0.57	0.374	0.594	0.508
Urine	0.90	1.14	0.87	1.08	0.182	0.239	0.818	0.947
Methane	1.30	1.06	1.14	1.04	0.041	0.007	0.066	0.134
Energy retention
NEL, MJ/d	3.87	3.46	4.47	3.79	0.328	0.116	0.179	0.694
BW change, g/d	47.5	43.0	62.5	52.1	8.32	0.383	0.167	0.731
Utilisation of gross energy, %
DE/GE	64.9	65.3	64.7	65.0	0.74	0.651	0.756	0.920
ME/GE	57.1	57.5	58.1	57.4	1.04	0.902	0.675	0.627
Milk/GE	13.5	12.0	14.6	13.5	1.00	0.208	0.223	0.853
CH₄/GE	4.52^a	3.73^b	3.75^b	3.70^b	0.072	0.001	0.001	0.002

¹Means by treatment was the pooled data from goats at weeks 3 and 9, n = 3 for the measurements related to CH₄ and n = 6 for the others
^a,bMeans in the same row with different superscripts differ significantly (P < 0.05). The P-values for all the F × N × week. interactions were higher than 0.05, and they were not listed in the table
CON Control, FUM Fumaric acid, NPD N-[2-(nitrooxy)ethyl]-3-pyridinecarboxamide, FN FUM+ NPD, BW Body weight, GE Gross energy, DE Digestible energy, NEL Net energy for lactation, ME Metabolizable energy, SEM Standard error of means

ISSN: 2049-1891