Table 6. Carbon and nitrogen balance (g/kg of BW^0.75) 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
Cintake	52.4	50.1	56.1	52.0	53.2	1.04	0.103	0.446	0.242
Cfeces	15.0b	13.7b	19.8a	15.7	16.3	0.70	0.001	0.369	0.555
Curine	1.3b	1.6b	1.8b	1.5	1.5	0.09	0.045	0.728	0.427
CCO2	21.5	22.6	21.1	20.8b	22.5a	0.44	0.366	0.026	0.244
CCH4	1.8	1.9	1.8	1.8	1.9	0.08	0.851	0.111	0.231
Cmilk	11.1	10.5	11.4	11.6	10.4	0.30	0.408	0.089	0.027
Cretained body	1.8a	0.2b	-0.2c	1.1a	0.5b	0.51	0.026	0.045	0.701
Nintake	2.7	2.3	2.9	2.6	2.6	0.06	0.003	0.460	0.238
Nfeces	0.9	1.0	1.2	1.0	1.0	0.04	0.075	0.978	0.870
Nurine	0.5b	0.4b	0.6a	0.4b	0.6a	0.03	0.043	0.014	0.498
Nmilk	0.8	0.7	0.8	0.8	0.8	0.02	0.044	0.248	0.075
Nretained body	0.4a	0.2b	0.3a	0.4	0.3	0.04	0.043	0.145	0.196
TE protein, kJ/kg of BW0.75	64.0a	28.3c	50.0b	58.5	42.2	11.52	0.023	0.238	0.552
TE fat, kJ/kg of BW0.75	19.2a	-40.6b	-45.0b	-9.3b	-20.0a	10.56	0.045	0.048	0.506

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

¹C_intake = C intake; C_feces = C losses in faeces; C_urine = C losses in urine; C_CO2 = C losses in CO₂; C_CH4 = C losses in methane; C_milk = recovered C in milk; C_{retained body} = recovered C in tissue; N_intake = N intake; N_feces = N losses in faeces; N_urine = N losses in urine; N_milk = recovered N in milk; N_{retained body} = recovered N in tissue.

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

³1 = first period; 2 = second period.

⁴SEM = standard error of the mean.