Effects of dietary tryptophan and stocking density on the performance, meat quality, and metabolic status of broilers

Table 4 Effects of stocking density and tryptophan (TRP) level on plasma parameters of broilers¹

Stocking density, birds/m²	Tryptophan Concentration, %	LDH², U/L	GLU, mg/dL	TG, mg/dL	TC, mg/dL	GPT, U/L	GOT, U/L
Stocking density × tryptophan level
11.0	0.18	24,219^ab	239.1^b	39.49	106.1	2.88^b	32.92
11.0	0.27	22,317^b	228.2^b	51.48	121.2	3.83^b	31.95
15.4	0.18	28,028^a	232.6^b	48.30	104.8	9.10^a	32.60
15.4	0.27	19,695^b	256.9^a	58.97	121.2	5.05^b	32.33
SEM		5,106.0	16.66	17.956	16.67	2.595	4.575
Stocking density
11.0		23,268	233.6	45.49	113.6	3.36	32.43
15.4		23,861	244.8	53.63	113.0	7.08	32.47
SEM		1,042.3	3.40	3.665	3.40	0.529	0.934
TRP level
0.18%		26,123	235.9	43.89	105.4	5.99	32.76
0.27%		21,006	242.5	55.23	121.2	4.44	32.14
SEM		1,042.3	3.40	3.665	3.40	0.529	0.934
P value
Stocking density		0.742	0.053	0.272	0.925	<0.001	0.987
TRP level		0.009	0.232	0.132	0.023	0.001	0.761
Density × TRP		0.024	0.004	0.928	0.925	<0.001	0.863

¹Each mean represents 8 birds for each treatment.
²LDH: lactic dehydrogenase; GPT: glutamic-pyruvic transaminase; GOT: glutamic-oxalacetic transaminase; GLU: glucose; TG: triglyceride; TC: total cholesterol.
^a,bMeans in the same row with different superscripts are significantly different (P < 0.05).

ISSN: 2049-1891