Table 2.

Body composition of body weight-selected line chicks during first 2 wk posthatch

Effect	YSW, g	YSW, %BW	Fat Mass, g	Fat Mass, %BW	Lean Mass, g	Lean Mass, %BW
Age
DOH	4.03	12.79	-	-	24.30c	62.25
D4	0.35	0.65	5.06	6.98	45.03b	61.98
D14	-	-	42.96	20.52	125.86a	60.23
SE	0.19	0.47	0.78	0.46	1.36	0.78
P value	<0.0001	<0.0001	<0.0001	<0.0001	<0.0001	0.16
Line
LWS	3.12	13.03	2.73	7.32	15.85	52.93
HWS	4.95	12.55	24.01	13.75	65.06	61.49
SE	0.27	0.67	0.55	0.33	0.79	0.45
P value	0.0001	0.6201	<0.0001	<0.0001	<0.0001	<0.0001
A × L	0.0254	0.4911	<0.0001	<0.0001	<0.0001	0.07

Effects of age [day of hatch (DOH), day 4 posthatch (D4), and day 14 posthatch (D14)], line (low- and high-body weight-selected lines; LWS and HWS, respectively), and the interaction between age (A) and line (L) on absolute yolk sac weight (YSW), lean and fat mass and as a percentage of body weight (%BW) are shown. Values represent least squares means and pooled SE with associated P values for each effect (n = 6). (-) denotes that there was no comparison for the amount of fat on DOH because fat percentages were too low in each line to be determined accurately by the instrument, and on D14 there was no yolk sac remaining. Superscripted letters denote differences at P < 0.05.