Effects and interactions of dietary lysine and apparent nitrogen corrected metabolizable energy on yellow-feathered broiler breeder hens

Table 4 Effects of dietary lysine and AMEn on productive performance of yellow-feathered broiler breeders¹

Treatment		Final body weight, kg	Laying rate, %	Average daily egg mass, g	Feed intake/egg mass	Average egg weight, g	Rate of qualified eggs, %
Lys, %	AMEn, MJ/kg	Final body weight, kg	Laying rate, %	Average daily egg mass, g	Feed intake/egg mass	Average egg weight, g	Rate of qualified eggs, %
0.56	11.50	2.86	53.62	32.84	3.61	61.69	95.95
0.68	11.50	2.82	56.53	34.80	3.40	61.68	94.89
0.80	11.50	2.90	58.90	36.15	3.27	61.79	97.10
0.92	11.50	2.92	57.27	35.73	3.31	62.77	94.84
1.04	11.50	2.95	55.02	34.96	3.39	60.96	96.80
0.56	11.10	2.81	54.35	33.30	3.55	61.44	96.87
0.68	11.10	2.66	57.29	35.04	3.36	61.66	95.75
0.80	11.10	2.67	59.37	35.89	3.29	60.72	96.72
0.92	11.10	2.76	56.92	34.79	3.40	61.79	95.74
1.04	11.10	2.62	54.31	32.06	3.70	61.36	95.29
SEM		0.11	1.43	0.89	0.68	0.87	0.09
0.56		2.84	53.98^b	33.07^b	3.58^a	61.56	96.41
0.68		2.74	56.91^a	34.92^a	3.38^b	61.67	95.32
0.80		2.89	59.13^a	36.02^a	3.28^b	61.39	96.86
0.92		2.84	57.10^b	35.26^a	3.36^b	62.27	95.33
1.04		2.79	53.77^c	32.96^b	3.60^a	61.68	96.35
SEM		0.07	1.01	0.63	0.48	1.03	0.06
	11.10	2.71^b	56.09	34.22	3.46	61.40^b	96.04
	11.50	2.89^a	56.27	34.68	3.42	61.96^a	96.07
	SEM	0.04	0.64	0.40	0.30	0.64	0.04
Mean effects
Lys²		0.902	0.001	0.002	0.001	0.344	0.098
Linear		0.760	0.449	0.289	0.359	0.865	0.803
Quadratic		0.953	< 0.001	0.001	0.001	0.736	0.441
AMEn		0.001	0.833	0.388	0.445	0.043	0.961
Lys × AMEn		0.058	0.763	0.694	0.630	0.701	0.130
Linear Lys × AMEn		0.195	0.534	0.047	0.039	0.869	0.102
Quadratic Lys × AMEn		0.969	0.855	0.422	0.384	0.177	0.530

Quadratic regression equations based on supplemental lysine level (%):
(a) Laying rate (%) = −56.96 lysine² + 94.03 lysine + 19.34, P = 0.020, R² = 0.783, which yielded optimized lysine level as 0.83%
(b) Average daily egg mass (g) = −674.17 lysine² + 1,102.9 lysine + 122.54, P = 0.003, R² = 0.987, which yielded optimized lysine level as 0.82%
(c) Feed intake/egg mass = 4.45 lysine²−7.25 lysine + 6.24, P = 0.001, R² = 0.995, which yielded optimized lysine level as 0.81%
Lys Lysine, AMEn Nitrogen-corrected apparent metabolizable energy
^a–cWithin a column, means without common superscripts within a main effect differ significantly (P < 0.05)
¹For the interaction effect, values are means of 6 replicates per treatment each with 16 broilers. For the main effects, values are means of 12 replicates each with 16 broilers or 30 replicates each with 16 broilers, respectively
²Linear and quadratic effects of lysine were tested when significant main effect was detected

ISSN: 2049-1891