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

Table 3 Effects of Saccharomyces cerevisiae fermentation product on lactation performance of dairy cows fed corn stover-containing diet

Item^a	SCFP^b, g/d				SEM	P-value^c
Item^a	0	60	120	180	SEM	L	Q	W	T × W
DMI, kg/d	20.1	20.3	19.9	19.9	0.22	0.26	0.54	<0.01	0.92
Milk yield, kg/d	22.1	21.8	22.6	22.3	0.28	0.08	0.89	<0.01	<0.01
ECM, kg/d	25.4	25.8	26.0	25.7	0.35	0.52	0.35	<0.01	<0.01
Milk composition, %
Fat	4.35	4.41	4.35	4.36	0.075	0.95	0.81	<0.01	<0.01
Protein	3.41	3.44	3.41	3.44	0.039	0.74	0.87	<0.01	<0.01
Lactose	4.78	4.79	4.73	4.75	0.036	0.33	0.87	<0.01	0.65
Total solids	13.7	13.7	13.4	13.6	0.19	0.55	0.59	<0.01	0.98
SCC, ×10⁴	57.9	35.2	46.9	47.6	11.4	0.63	0.78	0.95	0.75
MUN, mg/dL	13.9	13.8	13.9	13.8	0.37	0.84	0.86	<0.01	0.75
Initial BW, kg	654	643	670	651	13.7	0.78	0.47
BW gain, kg/d	0.17	0.22	0.15	0.05	0.14	0.62	0.27
BCS	2.98	2.77	2.99	2.80	0.10	0.47	0.94	0.04	0.20
Feed efficiency	1.28	1.28	1.32	1.28	0.025	0.17	0.50	<0.01	0.67
N conversion	24.7	24.3	25.2	25.1	0.21	0.04	0.82	<0.01	0.17

^aDMI = dry matter intake; ECM (energy-corrected milk, kg) = 0.3246 × milk yield (kg) + 13.86 × fat yield (kg) + 7.04 × protein yield (kg) [44]; SCC = somatic cell counts; MUN = milk urea nitrogen; Feed efficiency = kg of ECM/kg of DMI; BCS = body condition score; N conversion = kg of milk protein yield/kg of dietary crude protein intake × 100
^b Saccharomyces cerevisiae fermentation product (Diamond V Original XP, Cedar Rapids, Iowa, USA)
^cT = treatment effect; W = week effect; T × W = interaction between treatment and week; L = linear effect of treatment; Q = quadratic effect of treatment