Effects of Saccharomyces cerevisiae fermentation products on performance and rumen fermentation and microbiota in dairy cows fed a diet containing low quality forage

Table 6 Effects of Saccharomyces cerevisiae fermentation product on rumen microbial protein (MCP) supply of dairy cows fed corn stover-containing diet

Item^a	SCFP^b, g/d				SEM	P-value
Item^a	0	60	120	180	SEM	Linear	Quadratic
Urine volume^a, L/d	23.0	22.9	22.1	22.3	0.96	0.54	0.90
Urinary PD^b, mmol/d
Allantoin	304	280	351	330	12.6	0.01	0.90
Uric acid	27.0	28.0	25.3	27.3	1.15	0.74	0.68
Endogenous PD	50.6	45.2	47.7	44.7	3.97	0.63	0.84
Sum	330	307	373	346	12.7	0.05	0.89
MCP, g/d	1,293	1,120	1,459	1,418	47.6	<0.01	0.59

^aUrine volume (L/d) = body weight (kg) × 29 (mg/d)/creatinine (mg/L) [25]; Endogenous purine derivatives (PD) = 0.385 × BW^0.75; Sum = allantoin + uric acid − endogenous PD; Microbial protein (MCP), indirectly calculated based on PD [22]
^b Saccharomyces cerevisiae fermentation product (Diamond V Original XP, Cedar Rapids, Iowa, USA)