Table 4. Pre-weaning growth performance of ANGUS and BRANGUS nursing heifers with or without access to artificial shade (11×7.3 m in length and 2.4 m high) during summer (56-d; July to September).

	BREED			SHADE			P-value
Item	ANGUS	BRANGUS	SEM	SHADE	NO SHADE	SEM	BREED	SHADE	BREED × SHADE
Heifer age, d	181	168	3.45	171	178	3.47	0.04	0.18	0.26
Initial BW, kg	213	200	2.7	206	207	2.4	0.01	0.91	0.26
ADG, kg
0 to 14	1.32	1.00	0.08	1.31	1.00	0.08	0.03	0.03	0.77
0 to 28	1.23	0.77	0.12	1.00	1.00	0.07	0.45	0.71	0.36
0 to 42	0.82	0.90	0.05	0.90	0.81	0.05	0.19	0.13	0.80
0 to 56	0.73	0.77	0.05	0.82	0.68	0.05	0.49	0.10	0.48
BW1, kg
d 14	232	214	1.96	225	220	2.54	0.01	0.27	0.35
d 28	246	224	2.22	235	234	2.23	0.002	0.94	0.03
d 42	249	237	2.13	245	241	1.93	0.01	0.18	0.06
Weaning weight, kg	257	240	2.45	250	246	2.45	0.01	0.34	0.04

¹Interim and weaning weight were covariate adjusted for calf age.