Bacterial direct-fed microbials fail to reduce methane emissions in primiparous lactating dairy cows

Table 2 Enteric methane (CH₄) emissions of lactating cows fed high-starch or high-fiber diets (CTL) supplemented with bacterial direct-fed microbials (DFM) Propionibacterium freudenreichii 53 W (PF), Lactobacillus pentosus D31 (LP), and Lactobacillus bulgaricus D1 (LB)

CH₄ emissions	Treatment				SEM^a	P-value
CH₄ emissions	CTL	PF	LP	LB	SEM^a	Treatment	CTL vs DFM^b
CH₄, g/d
High-starch diet	286.4	327.8	303.9	271.4	21.12	0.33	0.56
High-fiber diet	290.8	310.0	301.4	292.3	9.79	0.51	0.38
CH₄, g/kg DMI
High-starch diet	20.0	22.8	21.3	18.7	2.19	0.62	0.72
High-fiber diet	23.9	24.8	24.0	24.0	1.16	0.93	0.81
CH₄, g/kg milk
High-starch diet	13.1	16.7^*	14.6	12.6	0.78	0.02	0.12
High-fiber diet	18.9	18.7	18.2	19.0	1.53	0.98	0.87
CH₄, g/kg ECM^c
High-starch diet	12.6	15.6	14.4	12.5	1.02	0.15	0.22
High-fiber diet	18.1	17.4	17.0	18.9	1.11	0.64	0.80

^aSEM-standard error of the means
^bP-value for control vs all direct-fed microbials (DFM) within each diet
^cECM-energy corrected milk [(0.327 × kg of milk) + (12.95 × kg of fat) + (7.65 × kg of protein)]
^*Significantly (P ≤ 0.05) different from CTL group

ISSN: 2049-1891