Effects of urea plus nitrate pretreated rice straw and corn oil supplementation on fiber digestibility, nitrogen balance, rumen fermentation, microbiota and methane emissions in goats

Table 3 Effect of urea plus nitrate pretreated rice straw (UN) and combination of UN and corn oil supplementation (UNCO) on apparent total-tract digestibility, N balance and methane emissions in goats

Items	Treatment			SEM	P - value
Items	Control	UN	UNCO	SEM	P - value
DMI, g/d	484^b	501^a	496^ab	4.2	0.03
Apparent total-tract digestibility, g/kg
DM	656^b	666^ab	674^a	7.0	0.05
OM	688^b	711^a	720^a	10.5	< 0.001
NDF	542^b	577^a	587^a	11.1	< 0.001
ADF	530	539	538	10.9	0.62
CP	631	634	638	14.0	0.76
GE	629^b	641^b	668^a	12.1	< 0.001
Nitrogen balance
N intake, g/d	8.41^c	9.81^a	9.13^b	0.051	< 0.001
Urinary N, g/d	2.94^b	4.35^a	3.32^b	0.198	< 0.001
Urinary N to N intake ratio, %	35.0^b	44.3^a	34.4^b	2.19	< 0.001
Fecal N, g/d	3.10^b	3.60^a	3.30^b	0.141	< 0.001
Fecal N to N intake ratio, %	36.9	36.6	36.2	1.39	0.77
N excretion, g/d	6.05^b	7.95^a	6.62^b	0.238	< 0.001
N excretion to N intake ratio, %	71.9^b	81.0^a	72.5^b	2.19	< 0.001
N retention, g/d	2.36^a	1.86^b	2.51^a	0.208	< 0.001
N retention to N intake ratio, %	28.1^a	19.1^b	27.5^a	2.40	< 0.001
Methane emissions
g/d	9.91^a	9.24^ab	8.92^b	0.779	0.04
g/kg DMI	20.6^a	18.5^b	18.0^b	1.59	0.03
g/kg OM digested	32.8^a	28.5^b	27.3^b	2.32	< 0.001
g/kg NDF digested	76.3^a	61.2^b	63.7^b	4.44	< 0.001
% of GE intake	6.41^a	5.69^b	5.32^b	0.481	0.004

^a-cMeans with different superscripts within a row are significantly different (P ≤ 0.05)

ISSN: 2049-1891