Table 9. Methane emission of Murciano-Granadina goats (n = 12) during midlactation by type of diet and period.

	Diet2			Period3			P-Value
Item1	BRL	OP	SH	1	2	SEM4	Diet	Period	Diet x Period
CH4, L/d	57.0	59.6	55.5	54.6	60.0	1.98	0.761	0.166	0.608
Ym, %	6.3	6.9	5.9	6.1	6.6	0.21	0.170	0.187	0.732
CH4/DMi, g/kg	20.1	21.1	19.0	19.3	20.9	0.61	0.498	0.183	0.717
CH4/OMi, g/kg	21.7	23.1	20.7	20.9	22.7	0.67	0.467	0.177	0.715
CH4/milk, g/kg	18.3	21.4	18.4	16.2b	22.1a	0.91	0.131	0.001	0.928

^a,bMeans within a row with different superscripts differ (P < 0.05).

¹Ym = methane energy/gross energy intake; DMi = dry matter intake; OMi = organic matter intake.

²BRL = barley; OP = orange pulp; SH = soybean hulls.

³1 = first period; 2 = second period.

⁴SEM = standard error of the mean.