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

Table 5

Intake (g/day unless stated otherwise) and metabolizability coefficients (g/g nutrient intake) of nutrients in broiler chickens fed diets supplemented with L-lysine.HCl and L-lysine sulfate.

Measurements^1	Source of supplemental lysine			SE	Significance ($P$ value)
	Control${}^{\#}$	L-lysine.HCl	L-lysine sulfate
Intake
Food	93.8${}^{\text{b}}$	92.8${}^{\text{b}}$	90.3${}^{\text{a}}$	0.75	.028
Crude protein	19.5	19.4	19.2	0.11	.673
Metabolizable energy MJ${}^{\&}$	1.22	1.21	1.18	0.011	.286
Phosphorus${}^{\&}$	0.648${}^{{}^{\text{a}}}$	0.64${}^{\text{a}}$	0.705${}^{\text{b}}$	0.007	.0001
Lysine${}^{\&}$	0.988${}^{\text{b}}$	1.12${}^{\text{b}}$	1.44${}^{\text{c}}$	0.007	.0001
Methionine${}^{\&}$	0.441${}^{\text{a}}$	0.442${}^{\text{a}}$	0.76${}^{\text{b}}$	0.003	.0001
Cysteine${}^{\&}$	0.236${}^{\text{a}}$	0.234${}^{\text{a}}$	0.323${}^{\text{b}}$	0.009	.0001
Arginine${}^{\&}$	1.39${}^{\text{a}}$	1.38${}^{\text{a}}$	1.72${}^{\text{b}}$	0.05	.0001
Threonine${}^{\&}$	0.767${}^{\text{a}}$	0.759${}^{\text{a}}$	1.01${}^{\text{b}}$	0.007	.0001
Tryptophan${}^{\&}$	0.188${}^{\text{a}}$	0.186${}^{\text{a}}$	0.313${}^{\text{b}}$	0.002	.0001
Metabolizability coefficient
Dry matter	0.648${}^{\text{a}}$	0.684${}^{\text{a}}$	0.757${}^{\text{b}}$	0.015	.002
Organic matter	0.657${}^{\text{a}}$	0.713${}^{\text{a}}$	0.779${}^{\text{b}}$	0.009	.0001
Crude protein	0.516${}^{\text{a}}$	0.552${}^{\text{a}}$	0.661${}^{\text{b}}$	0.01	.003
N retention g/g intake	0.517${}^{\text{a}}$	0.551${}^{\text{a}}$	0.661${}^{\text{b}}$	0.015	.003
Protein accretion/g CP intake	0.527 ${}^{\text{a}}$	0.546 ${}^{\text{a}}$	0.603 ${}^{\text{b}}$	0.008	.001
Live weight gain/g CP intake	2.48${}^{\text{a}}$	2.59${}^{\text{a}}$	2.76${}^{\text{b}}$	0.026	.001
Live weight gain/MJ ME intake	39.4${}^{\text{a}}$	41.7${}^{\text{ab}}$	44.7${}^{\text{b}}$	0.41	.001
Live weight gain/g lysine intake	48.8${}^{\text{c}}$	45.1${}^{\text{b}}$	41.7${}^{\text{a}}$	0.44	.0001

¹Based on data obtained during the metabolism trial conducted between day 32 to 38 ($n=10$) selected at random from each treatment group.
Means bearing dissimilar superscripts varied significantly.
${}^{\&}$ based on calculated values of dietary energy and total amino acid concentrations in the starter and the finisher diets.