Table 6.

Cook loss properties and ether extract and nitrogen content of breast meat of broiler chickens fed diets with different amino acid (AA) densities under different stocking densities from 0 to 49 d of age¹.

AA density2	Stocking density3	Cook loss (%)		WHC (%)		Ether extract	N
		24 h	48 h	24 h	48 h	(g/kg, as-is)	(g/kg, as-is)
Norm	High	26.4	31.1d	11.4	11.3	10.4	37.5
Norm	Low	27.9	30.0d	12.3	11.4	12.9	36.3
10%Low	High	30.2	32.6b,c	13.9	12.7	14.0	37.3
10%Low	Low	28.1	31.3c,d	13.9	12.3	18.3	34.2
20%Low	High	29.3	33.0a,b	14.1	12.2	12.0	34.7
20%Low	Low	30.8	34.1a	12.7	11.5	10.1	33.1
SEM		1.71	0.48	0.58	0.53	2.7	1.1
AA density
Norm		27.3	30.6c	11.9b	11.3	11.9	36.8
10%Low		28.4	31.9b	13.9a	12.5	15.7	36.0
20%Low		29.5	33.6a	13.4a	11.9	11.1	33.9
SEM		0.94	0.34	0.41	0.37	2.3	0.80
Stocking density
High		29.6	32.3	13.1	12.1	12.4	36.4
Low		28.2	31.8	13.0	11.7	13.2	34.6
SEM		0.69	0.28	0.34	0.30	2.1	0.64
P values
AA density		0.257	<0.001	0.003	0.097	0.429	0.052
Stocking density		0.851	0.258	0.748	0.415	0.635	0.055
AA density × stocking density		0.493	0.023	0.141	0.749	0.730	0.689
AA density linear		0.133	<0.001	0.012	0.316	0.885	0.019
AA density quadratic		0.721	0.760	0.016	0.056	0.210	0.750

^a–dMeans with different superscripts within a trait differ significantly (P ≤ 0.05).

Abbreviation: WHC, water-holding capacity.

¹Means represent 6 replicates with 3 randomly selected birds per replicate and 18 birds per treatment.

²Norm = recommended amino acid (AA) density; 10%low = 10% lower than norm AA density; 20%low = 20% lower than norm AA density.

³High = 35 kg of body weight/m²; low = 26 kg of body weight/m² of stocking density.