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

Table 6

Estimation of fasting and endogenous nitrogen loss in the experimental broiler chickens.

Measurements^1		Source of supplemental lysine			SE	Significance ($P$ value)
		Control${}^{\#}$	L-lysine.HCl	L-lysine sulfate
Live weight g	Initial^2	2016	2066	2086	30.4	.644
	Final^3	1858${}^{\text{a}}$	1929${}^{\text{a}}$	2007${}^{\text{b}}$	30.2	.017
Change in live weight g		−159	−137	−80	3.6	.0001
Food intake g/day		67.2	70.4	67.1	2.68	.846
Fasting N excretion g/day		3.44	3.99	4.53	0.19	.109
Endogenous N excretion g/day		1.63	2.18	1.92	0.12	0.215
Serum protein g/L	Initial${}^{\#}$	35.7	32.7	32.9	0.98	.314
	Final${}^{\&}$	28.5	28.9	31.1	1.09	.001
Serum creatinine $\mu$mL/L	Initial${}^{\#}$	51.1	52.1	51.1	4.85	.709
	Final${}^{\&}$	42.4	75.3	70.9	1.12	.0001

¹Based on data obtained during the fasting trial conducted at tandem with the metabolism trial ($n=10$) selected at random from each treatment group. The birds were fasted for 48 hours and then fed with tapioca starch for 6 days. The tapioca starch was supplemented with all the additives as it was with basal diet except the lysine.
²Indicates live weight after the fast ended and feeding of tapioca starch started.
³Indicates the end of feeding tapioca starch for 6 days.