Table 4. Carcass trait and mammary gland pixels’ pattern of Holstein × Gyr crossbred heifers on a rotational grazing system Panicum maximum cv. Mombaça pasture.

Item	Supplement1			SEM2	P-Value3
	CON	S12CP	S24CP		CON × SUP	S12CP × S24CP
Rib eye area, cm2	53.32	56.00	61.56	1.983	0.040	0.070
Back fat thickness, mm	2.72	2.81	2.66	0.216	0.952	0.663
Parenchymal, pixels/mm2	4.65	4.67	4.66	0.076	0.920	0.920
Fat pad, pixels/mm2	5.09	5.11	5.09	0.018	0.540	0.490

¹CON = not supplemented; S12CP: supplemented with concentrate containing 12% CP; S24CP: supplemented with concentrate containing 24% CP.

²Standard error of the mean.

³CON × SUP = effect of supplementation; S12CP × S24CP = effect between protein levels in the supplement.