Energetic-protein supplementation in the last 60 days of gestation improves performance of beef cows grazing tropical pastures

Table 7 Nitrogen utilization according to amount of supplement fed

Item^a	Treatment^b				SEM	P-value^c
Item^a	3.0 kg	1.5 kg	1.0 kg	0.0 kg	SEM	L	Q	C
Nmic, g/d	72.87	77.99	48.02	36.14	16.4	0.17	0.58	0.82
Nmic, g/g N ingested	0.747	0.788	0.605	0.533	0.20	0.45	0.76	0.93
Nmic, g/kg OMD	26.71	26.21	19.99	14.87	7.19	0.25	0.72	0.67
SUN, mg/dL	13.77	12.72	12.37	10.85	1.70	0.20	0.88	0.41
UUN, g/d	61.36	47.59	33.35	32.39	9.85	0.09	0.53	0.48

^aNmic – microbial N; OMD – organic matter digested; SUN – Serum urea nitrogen; UUN – Urine urea N
^bTreatments: 3.0 kg – cows received 3.0 kg of concentrate daily; 1.5 kg – cows received 1.5 kg of concentrate daily; 1.0 kg – cows received 1.0 kg of concentrate daily; and 0.0 kg – no concentrate supplement was fed
^cL, Q and C – effects of linear, quadratic and cubic order of level of supplementation

ISSN: 2049-1891