Table 3. Linear mixed effects models of the residual body mass (g) of field and aviary chicks in relation to sex and the proportion of terrestrial food in diet (field) or diet treatment (aviary).

Non-significant interactions were removed from each model.

	Estimated marginal mean or coefficient ± s.e	F-statistic	d.f.	p-value
Field
Proportion Terrestrial Food		0.36	1,57	0.165
Sex		0.007	1,43	0.952
Female	1.23 ± 5.52
Male	0.65 ± 4.52
Age		0.95	2,86	0.378
0–10 days	5.10 ± 4.86
10–20 days	0.19 ± 4.86
20–30 days	−2.47 ± 4.86
Proportion Terrestrial Food x Age		3.15	2,88	0.047
0–10 days	32.03 ± 24.52
10–20 days	−58.37 ± 27.83*
20–30 days	−65.73 ± 27.95*
Aviary
Diet		0.33	1,17	0.571
Fish	−4.70 ± 3.72
Chicken	−1.67 ± 3.72
Sex		8.95	1,17	0.008
Female	−11.05 ± 3.72
Male	4.68 ± 3.72
Age		0.1	2,38	0.379
0–10 days	−6.06 ± 3.39
10–20 days	−2.55 ± 3.39
20–30 days	−0.95 ± 3.39

Notes.

^*p < 0.05.