Table 2. DMI and enteric methane emission of Holstein and Jersey steers with different levels of mineral supplementation

Parameters	Holstein			Jersey			SEM	Mixed p-value
Parameters	Con	NM	HM	Con	NM	HM	SEM	B	T	B × T
DMI (kg/d)	12.74	13.32	12.90	11.02	11.29	11.37	1.172	0.125	0.947	0.982
CH₄ production (g/d)	170.53	157.22	147.75	219.08	184.79	189.63	18.238	0.032	0.379	0.867
CH₄ yield (g/kg DMI)	13.58	12.66	11.79	20.23	16.37	17.25	2.399	0.023	0.557	0.840
RT (°C)	39.33	39.30	39.10	39.13	39.10	39.03	0.115	0.185	0.452	0.853

Con, only TMR (without mineral supplementation); NM, TMR + NRC recommended concentration of mineral supplementation (Se 0.1 ppm + Zn 30 ppm + Cu 10 ppm)/kg DM; HM, TMR + higher than recommended concentration of mineral supplementation (Se 3.5 ppm + Zn 350 ppm + Cu 28 ppm)/kg DM; B, breed effect; T, trace mineral supplementation effect; B × T, interaction effect between breed and trace mineral supplementation.
DMI, dry matter intake; CH₄, methane; RT, rectal temperature; TMR, total mixed rations; NRC, National Research Council; DM, dry matter.