Objective of this study was to test the effect of a forage inoculant (Bonsilage corn, Schaumann Inc., Mendota Heights, MN) containing Lactobacillus buchneri, (DSM16774) and Lactobacillus plantarum, (DSM12837) on fermentation and aerobic stability of corn silage. Brown-midrib and conventional corn (33.8% and 37.0% DM, respectively) were ensiled untreated or treated with inoculant at 5 × 10⁵ cfu/g of fresh forage in bags. Data were analyzed by proc GLM (SAS v.9.4) as a 2 × 2 factorial with inoculant and corn silage as main effects. Ninety days after ensiling, the silages showed a similar response to the inoculant, except that BMR silage had a higher content of acetic acid and ethanol than conventional corn silage. The treated corn silages had less lactic acid compared with untreated silages and a greater concentration of acetic acid. The pH of treated silages was higher than untreated silages because of the decreased lactic acid and higher content of acetic acid. Untreated corn silages increased significantly in temperature after 95h of exposure to air, while treated silages did not increase in temperature during 168h of monitoring. Inoculating corn silage with 5 × 10⁵ cfu/g of the bacteria inoculant resulted in a more hetero fermentation and markedly improved the aerobic stability of corn silage. Table 1. The chemical composition and aerobic stability of corn silage¹ after 90 d of ensiling

Item	BMR			CS			P-value
Control	Treated	Control		Treated	Inoculant	Silage
DM, % as fed	32.8	31.2		37.5		36.2	0.92	<0.001
pH	3.80	4.23		3.80		4.20	<0.001	0.37
Lactic acid, % of DM	4.75	1.04		4.76		1.18	<0.001	0.57
Acetic acid, % of DM	1.69	3.81		1.58		3.17	<0.001	0.01
Total acids, % of DM	6.44	4.88		6.34		4.35	<0.001	0.12
Ethanol, % of DM	0.88	0.81		0.39		0.56	0.37	<0.001
L/A Ratio	2.82	0.27		3.02		0.37	<0.001	0.11
Aerobic stability2	98 h	ND		95 h	ND

¹BMR = brown-midrib; CS = conventional corn silage; treated with 5 × 10⁵ cfu/g of inoculant. ²Hours before temperature of silage increased 2? above ambient temperature.