Assessment of the Efficacy of L-Lysine Sulfate vis-à-vis L-Lysine Hydrochloride as Sources of Supplemental Lysine in Broiler Chickens

Table 3

Carcass traits and meat composition of broiler chickens fed diets supplemented with L-lysine.HCl and L-lysine sulfate.

Measurements		Source of supplemental lysine			SE	Significance ($P$  value)
		Control${}^{\#}$	L-lysine.HCl	L-lysine sulfate
Live performance^1
Live weight g	Day 0	39	38	38	0.44	.127
	Day 40	1969${}^{\text{a}}$	2055${}^{\text{ab}}$	2156${}^{\text{b}}$	20.2	.006
Live weight gain g		1929${}^{\text{a}}$	2017${}^{\text{b}}$	2119${}^{\text{b}}$	20.1	.005
Food intake g		3752${}^{\text{b}}$	3712${}^{\text{b}}$	3612${}^{\text{a}}$	30.3	.028
Cumulative FCR		1.95${}^{\text{b}}$	1.84${}^{\text{b}}$	1.71${}^{\text{a}}$	0.002	.023
Hot carcass weight g		1516	1559	1557	29.4	.807
Eviscerated weight g		1217	1255	1261	22.5	.696
Carcass yield %		66.7	66.4	69.2	0.95	.431
Yield of carcass components g^2
Frame		251	285	286	6.28	.064
Breast		367${}^{\text{a}}$	427${}^{\text{b}}$	430${}^{\text{b}}$	8.0	.009
Legs		360	350	369	8.9	.671
Wings		114	115	105	2.4	.196
Giblets		106	112	115	3.6	.618
Yield of carcass components (%live weight)^2
Frame		18.9${}^{\text{a}}$	20.9${}^{\text{b}}$	20.7${}^{\text{b}}$	0.26	.015
Breast		27.9${}^{\text{a}}$	31.3${}^{\text{b}}$	31.3${}^{\text{b}}$	0.58	.05
Legs		27.1	25.6	25.8	0.36	.224
Wings		8.6${}^{\text{b}}$	8.5${}^{\text{b}}$	7.6${}^{\text{a}}$	0.14	.028
Meat composition g/100 g fresh weight (unless stated other wise)^2
Moisture		69.2	69.83	67.56	0.39	.61
Ash		5.1	4.9	4.5	0.35	.38
Fat		5.02${}^{\text{ab}}$	4.37${}^{\text{a}}$	5.97${}^{\text{b}}$	0.07	.024
Protein		20.68${}^{\text{a}}$	20.9${}^{\text{a}}$	21.97${}^{\text{b}}$	0.29	.005
Protein accretion g		405.9${}^{\text{a}}$	424.8${}^{\text{a}}$	494.3${}^{\text{b}}$	6.57	.0001

¹Mean values of 8 replicates ($n=10$ birds in each replicate).
² Mean values of 10 birds selected randomly from each treatment group.
Means bearing dissimilar superscripts varied significantly.