Table 1.

Least square means (SEM) for serum IgG concentrations (mg/mL) from birth (d 0) to 168 h hours (h) for the calf progenies of H, CL and LF cows.

	0 h	12 h	24 h	48 h	72 h	168 h	SE	T	S	T × S
H	0.64a	14.34b,x	13.59b,x	14.47b,x	13.47b,x	9.01b,x	1.51	0.04	P < 0.0001	P < 0.0001
CL	0.01a	14.34b	18.34b,x	17.19b	15.93b	14.35b,z	1.61
LF	0.01a	19.34b,y	24.91 b,y	22.31b,y	19.57b,y	17.75b,y	1.61

T; Treatment, S (sampling time); H = Holstein; CL = Charolais × Limousin (n = 7), LF = Limousin × Friesian (n = 7); ^a,bWithin rows, Lsmeans differ from d 0 by P < 0.05. ^x,y,zWithin columns Lsmeans differ across breed by P < 0.05.