Assessment of the dietary amino acid profiles and the relative biomarkers for amino acid balance in the low-protein diets for broiler chickens

Table 5 Effects of different methionine and cysteine allowance on growth performance of AA broilers

Item		Con(+)	Con(-)	M&C(-)	M&C(+)	SEM	P-value
Male
0–14 d	IBW	0.044	0.043	0.044	0.043	< 0.001	0.355
	FBW	0.347^b	0.383^ab	0.392^a	0.391^a	0.010	0.083
	ADFI	0.029^b	0.034^a	0.034^a	0.033^a	0.001	0.016
	ADG	0.022^b	0.025^a	0.025^a	0.025^a	0.001	0.052
	FCR	1.304	1.363	1.349	1.329	0.033	0.705
15–28 d	FBW	1.244	1.262	1.335	1.244	0.031	0.407
	ADFI	0.094	0.104	0.105	0.099	0.003	0.211
	ADG	0.064	0.063	0.067	0.062	0.002	0.357
	FCR	1.462^b	1.656^a	1.553^ab	1.611^a	0.030	0.016
29–40 d	FBW	2.338	2.313	2.491	2.301	0.049	0.323
	ADFI	0.145	0.148	0.158	0.145	0.005	0.493
	ADG	0.091	0.087	0.096	0.088	0.002	0.289
	FCR	1.591	1.690	1.638	1.643	0.043	0.623
0–40 d	ADFI	0.086	0.092	0.096	0.090	0.002	0.215
	ADG	0.058	0.057	0.061	0.057	0.002	0.428
	FCR	1.499	1.631	1.569	1.588	0.033	0.152
Female
0–14 d	IBW	0.043	0.044	0.044	0.044	< 0.001	0.754
	FBW	0.340	0.361	0.367	0.346	0.007	0.206
	ADFI	0.029^b	0.032^a	0.031^ab	0.030^ab	0.001	0.083
	ADG	0.021	0.023	0.023	0.021	0.001	0.114
	FCR	1.362	1.370	1.322	1.396	0.019	0.175
15–28 d	FBW	1.195	1.194	1.236	1.215	0.029	0.796
	ADFI	0.090	0.094	0.096	0.096	0.002	0.116
	ADG	0.061	0.059	0.062	0.062	0.002	0.725
	FCR	1.480	1.588	1.551	1.562	0.043	0.474
29–40 d	FBW	2.235	2.194	2.334	2.280	0.047	0.288
	ADFI	0.137^b	0.140^b	0.153^a	0.147^ab	0.003	0.049
	ADG	0.087^ab	0.083^b	0.092^a	0.089^ab	0.002	0.080
	FCR	1.588	1.685	1.666	1.651	0.038	0.536
0–40 d	ADFI	0.083^b	0.086^ab	0.090^a	0.088^a	0.001	0.036
	ADG	0.055^ab	0.054^b	0.057^a	0.056^ab	0.001	0.140
	FCR	1.517	1.605	1.583	1.585	0.021	0.114

Con(+) The normal-protein control group, Con(-) The low-protein control group, M&C(-) The methionine and cysteine restriction group, M&C(+) The methionine and dysteine supplementation group, IBW Initial body weight, FBW Final body weight, ADFI Average daily feed intake, ADG Average daily gain, FCR Feed:Gain, SEM Standard error of the mean
^a,bDissimilar letters represent significant difference among different treatments (P < 0.05)

ISSN: 2049-1891