Table 2.

Growth performance of broiler chickens fed different levels of summer savory extract (SSE).

Item	Level of SSE (mg/kg)					SME	p-Value
	0	100	200	300	400		L	Q
Feed intake (g/bird/d)
1–14 d	27.6	25.0	26.5	27.3	27.1	0.872	ns	ns
15–28 d	103.1	96.7	102.5	108.3	95.4	3.084	ns	*
29–42 d	151.7	140.2	151.9	144.7	141.4	4.084	ns	ns
1–42 d	94.2	87.3	93.6	93.4	88.0	1.682	ns	*
Body weight gain (g/bird/d)
1–14 d	27.2	19.5	21.0	21.9	21.0	0.723	ns	ns
15–28 d	63.3	62.1	62.6	65.5	60.9	2.494	ns	ns
29–42 d	78.6	76.2	79.6	74.1	78.6	2.579	ns	ns
1–42 d	54.3	52.6	54.4	53.8	53.5	0.589	ns	ns
FCR (g/g)
1–14 d	1.3	1.28	1.26	1.25	1.29	0.016	ns	ns
15–28 d	1.63	1.56	1.64	1.66	1.57	0.032	ns	ns
29–42 d	1.93	1.85	1.91	1.96	1.81	0.055	ns	ns
1–42 d	1.73	1.66	1.72	1.74	1.65	0.061	*	ns

SEM: standard error of the means; FCR: feed conversion ratio. Orthogonal contrasts: L = linear, Q = quadratic; ns: not significant; * p < 0.05.