Table 2.

Effects of feeding RSC containing high GLS on the N metabolism in steers (g/d).

Item	Dietary levels of RSC, % DM				SEM	P-value
	0	2.7	5.4	8.0		Ration	Linear	Quadratic
Daily liveweight gain, kg	0.28	0.33	0.32	0.36	0.04	0.513	0.176	0.877
Ingested N	66.67	67.25	67.57	66.94	–	–	–	–
Digested N	38.77a	38.20a	38.49a	36.46b	1.12	0.007	0.003	0.099
N excretion
Fecal N	27.90a	29.05a	29.08a	30.48b	1.12	0.005	<0.001	0.772
Urinary N	22.82	23.34	22.20	22.33	1.18	0.688	0.452	0.803
Fecal N to urinary N ratio	1.24	1.26	1.34	1.37	0.07	0.178	0.035	0.891
Total N excretion	50.72	52.39	51.28	52.80	1.80	0.234	0.158	0.927
N retention	15.95	14.87	16.29	14.14	1.80	0.221	0.264	0.493
N retention rate1, %	23.92	22.11	24.11	21.12	2.69	0.236	0.234	0.614

RSC = rapeseed cake; GLS = glucosinolates; N = nitrogen; LW = liveweight.

^a,b Means in the same row with different superscripts differ (P < 0.05, n = 8).

¹N retention rate = N retention/ingested N × 100.