. 2019 Dec 4;9(12):1084. doi: 10.3390/ani9121084

Table 4.

Nitrogen (N) balance and purine derivative of cattle feeding rice straw and purple field corn stove treated Pleurotus ostreatus and Volvariella volvacea.

Parameters	Rice Straw		Purple corn stove		SEM	Contrast
Parameters	P. osteratus	V. volvacea	P. osteratus	V. volvacea	SEM	R	WRF	R × WRF
N intake (NI), g/d	62.91 ^a	62.77 ^a	77.93 ^b	81.90 ^b	3.84	<0.01	0.62	0.60
Total N excretion, g/d	50.23 ^a	51.02 ^a	55.56 ^b	58.23 ^b	0.58	0.02	0.88	0.65
Fecal N excretion, g/d	15.07	15.31	16.67	17.47	1.89	0.18	0.68	0.44
Urinary N excretion, g/d	35.16 ^a	35.71 ^a	38.89 ^b	40.76 ^b	1.35	0.01	0.58	0.71
N absorption, g/d	47.84 ^a	47.46 ^a	61.26 ^b	64.43 ^b	2.36	<0.01	0.83	0.36
% of N absorption	30.10 ^a	29.79 ^a	47.74 ^b	52.77 ^b	1.55	0.02	0.65	0.89
N retention, g/d	12.68 ^a	11.75 ^a	22.37 ^b	23.67 ^b	1.23	0.03	0.33	0.47
% of N retention to N intake	20.16 ^a	18.72 ^a	28.71 ^b	28.90 ^b	2.19	0.05	0.53	0.77
PD, mmol/d
Allantoin excretion	80.55	80.27	88.17	88.15	0.51	<0.01	0.81	0.84
Allantoin absorption	74.62 ^a	74.27 ^a	82.92 ^b	82.77 ^b	0.58	<0.01	0.67	0.86
Microbial crude protein, g/d	275.11 ^a	274.16 ^a	301.14 ^b	301.07 ^b	3.97	<0.01	0.73	0.19
EMPS *	64.16 ^a	64.50 ^a	68.20 ^b	68.34 ^b	0.92	0.03	0.34	0.06

* RS = rice straw; PPCS = purple field corn stover; R = roughage; WRF = white rot fungi; R × WRF = interaction between roughage and white rot fungi; EMPS: efficiency of microbial protein synthesis. N: Nitrogen. Microbial crude protein (g/d) = 3.99 × 0.856 × mmoles of purine derivatives excreted. Efficiency of microbial N synthesis (EMNS, g/kg of organic matter (OM) digested in the rumen (OMDR) = ((MCP (g/d) × 1000)/DOMR (g)), assuming that rumen digestion was 650 g/kg OM of digestion in total tract. SEM, standard error of the mean. ^a,b Means differing letters across rows indicate significant differences (p < 0.05).