. 2023 May 22;102(8):102796. doi: 10.1016/j.psj.2023.102796

Table 4.

The effect of broiler breeds fed-restricted diets and different levels of threonine and their interactions on some hormonal parameters.

Items/breed		T3	T4	IGF1	GH
Ross		1.04 ± 0.01	0.89 ± 0.01	27.60 ± 0.49	40.93 ± 0.71
IR		1.09 ± 0.02	0.89 ± 0.02	28.68 ± 0.73	39.33 ± 0.82
Feed restriction
Control		1.04 ± 0.01	0.93 ± 0.02^a	29.18 ± 0.66^a	42.23 ± 0.71^a
Feed restriction		1.08 ± 0.02	0.85 ± 0.01^b	27.10 ± 0.56^b	38.03 ± 0.68^b
Threonine (%)
100		1.01 ± 0.01^b	0.79 ± 0.01^d	24.10 ± 0.35^d	34.50 ± 0.58^d
110		1.03 ± 0.02^b	0.83 ± 0.01^c	26.05 ± 0.28^c	38.80 ± 0.67^c
120		1.11 ± 0.02^a	0.95 ± 0.02^b	29.15 ± 0.42^b	41.95 ± 0.66^b
130		1.11 ± 0.01^a	0.99 ± 0.02^a	33.25 ± 0.63^a	45.25 ± 0.64^a
Feed restriction*threonine (%)
Control	100	1.00 ± 0.01^b	0.79 ± 0.01^f	25.10 ± 0.46^d	36.50 ± 0.58^d
	110	1.02 ± 0.01^b	0.85 ± 0.02^e	26.60 ± 0.40^cd	40.80 ± 0.77^c
	120	1.08 ± 0.02^ab	1.02 ± 0.01^b	30.30 ± 0.47^b	44.00 ± 0.42^b
	130	1.08 ± 0.02^ab	1.06 ± 0.01^a	34.70 ± 0.92^a	47.60 ± 0.60^a
Feed restriction	100	1.01 ± 0.04^b	0.79 ± 0.01^f	23.10 ± 0.31^e	32.50 ± 0.45^e
	110	1.04 ± 0.04^b	0.82 ± 0.01^f	25.50 ± 0.34^d	36.80 ± 0.64^d
	120	1.14 ± 0.04^a	0.88 ± 0.01^d	28.00 ± 0.49^c	39.90 ± 0.84^c
	130	1.14 ± 0.01^a	0.93 ± 0.01^c	31.80 ± 0.61^b	42.90 ± 0.43^b

The mean values in same column within each division with different superscripts (a–f) differ significantly (P < 0.05). T3: triidothyronine. T4: thyroxine. IGF1: insulin-like growth factor. GH: growth hormone.