Table 5.

Least square means of plasma protein, IgG, and urea nitrogen (PUN) in Holstein (H) and Jersey (J), male (M) and female (F) calves at birth and 24 h of age.

Variable	Least square means				SE	Differences of means1
	Holstein		Jersey			F minus M		H minus J
	F	M	F	M		H	J	F	M
0-h IgG (g/L)	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
24-h IgG (g/L)	9.90	12.35	16.75	16.19	0.92	−2.44*	0.56	−6.85**	−3.84**
AEA of IgG2 (%)	15.48	19.74	21.54	22.25	1.10	−4.27**	−0.71	−6.07**	−2.51†
0-h Total protein (g/dL)	4.284	4.440	4.196	4.104	0.130	−0.155	0.091	0.089	0.335*
24-h Total protein (g/dL)	5.203	5.723	6.032	5.972	0.160	−0.520**	0.060	−0.829**	−0.249†
0-h PUN (mg/dL)	13.949	14.388	16.008	15.187	1.069	−0.439	0.821	−2.059	−0.799
24-h PUN (mg/dL)	9.902	10.408	12.526	12.408	0.940	−0.506	0.118	−2.624*	−2.000*

¹Significance determined by slicing interaction of breed and gender.

²Apparent efficiency of absorption: (plasma IgG at 24 h × BW at birth, kg × 0.091)/IgG intake (g).

^†P < 0.10.

^*P < 0.05.

^**P < 0.01.