. 2023 Aug 22;102(11):103048. doi: 10.1016/j.psj.2023.103048

Table 3.

Apparent ileal digestibility coefficients of amino acids of broilers reared under different environmental conditions and feed regimens from 20 to 41 d and ileal content sampled at 41 d.

Treatment¹
Parameter³	TN-al	cyHS	coHS	TN-coPF	SEM²	P-values
Essential amino acids
Methionine	93.6^a	89.8^b	90.2^b	92.2^ab	0.94	0.005
Lysine	91.7^a	88.2^b	88.5^b	89.7^ab	1.29	0.017
Threonine	81.5	76.7	77.5	77.7	3.13	0.189
Valine	84.8	80.4	79.8	81.2	2.60	0.074
Isoleucine	86.0	81.4	81.4	82.9	2.30	0.049
Leucine	87.0^a	83.0^ab	81.9^b	84.7^ab	2.12	0.026
Arginine	92.6	90.4	90.4	92.1	1.78	0.243
Phenylalanine	88.3^a	83.4^b	84.3^b	87.7^a	1.26	<0.001
Histidine	88.5^a	84.9^ab	83.9^b	87.1^ab	2.04	0.027
Total essential amino acids	88.2^a	83.9^b	84.2^b	86.1^ab	1.15	<0.001
Nonessential amino acids
Alanine	86.8^a	83.0^ab	81.8^b	83.9^ab	2.22	0.043
Aspartic acid	85.2^a	80.4^b	83.2^ab	83.0^ab	1.50	0.006
Cysteine	80.5	73.6	71.3	79.0	4.36	0.089
Glutamic acid	90.0^a	86.3^b	87.3^b	88.2^ab	1.00	0.001
Glycine	82.7	77.6	77.2	79.0	2.86	0.068
Proline	85.0^a	80.0^b	80.7^ab	82.4^ab	2.22	0.031
Serine	86.5^a	82.5^b	82.6^b	83.3^ab	1.83	0.028
Tyrosine	90.4^a	87.0^ab	83.8^b	86.8^ab	2.61	0.030
Total nonessential amino acids	85.9^a	81.3^b	81.0^b	83.2^ab	1.68	0.005
Total⁴	87.1^a	82.7^b	82.7^b	84.8^ab	1.34	0.001

TN-al: Birds reared under continuous 24°C and ad libitum feeding. cyHS: Birds reared under cyclic high temperature (8 h at 35˚C and 12 h at 24˚C) and ad libitum feeding. coHS: Birds reared under continuous 35°C and ad libitum feeding. TN-coPF: Birds reared under continuous 24°C and pair-fed to the coHS treatment.

SEM: pooled standard error of the mean.

Values are means of 4 replicates per treatment (pool of 4 birds per replicate).

⁴

Total = Sum of all reported essential and nonessential amino acids.

^a-b

Means within row without a common superscript were determined to be significantly different (P < 0.05) by a Tukey's multiple comparison test.