. 2020 Apr 11;99(6):3266–3279. doi: 10.1016/j.psj.2020.03.024

Table 4.

Feed conversion ratio (from day 0 to 55) and feed cost to produce 1 kg BW (on day 41 and 55) of 5 strains of broilers fed a control or AA-reduced diet.

Treatment		Feed conversion ratio							Feed cost/BW ($/kg)²		Gross margin return ($/bird)		Gross margin return ($/kg BW)
Strain	Diet	Day 0-14	Day 14-28	Day 28-41	Day 41-55	Day 0-28	Day 0-41	Day 0-55	Day 41	Day 55	Day 41	Day 55	Day 41	Day 55
Strain 1		1.348^a	1.532	1.870^a,b	2.337	1.482	1.654	1.796	0.393	0.440	3.481	4.755	1.286	1.240
Strain 2		1.353^a	1.547	1.884^a	2.327	1.493	1.668	1.818	0.396	0.442	3.421	4.766	1.283	1.237
Strain 3		1.281^c	1.514	1.833^a,b	2.300	1.447	1.620	1.762	0.385	0.431	3.752	5.223	1.294	1.248
Strain 4		1.304^b,c	1.512	1.824^b	2.283	1.453	1.624	1.774	0.387	0.434	3.550	5.034	1.292	1.245
Strain 5		1.334^a,b	1.544	1.844^a,b	2.151	1.481	1.652	1.769	0.391	0.434	3.232	4.617	1.288	1.245
SEM¹		0.0082	0.0066	0.0153	0.0325	0.0055	0.0078	0.0090	0.0017	0.0028	0.0375	0.0649	0.0017	0.0027
	Control	1.309^b	1.444	1.823^b	2.271	1.407	1.593	1.740	0.397	0.446	3.621	4.988	1.282	1.233
	Reduced	1.339^a	1.616	1.879^a	2.288	1.536	1.694	1.828	0.384	0.426	3.353	4.770	1.296	1.253
	SEM	0.0052	0.0042	0.0097	0.0206	0.0034	0.0049	0.0057	0.0011	0.0018	0.0236	0.0410	0.0010	0.0017
Strain 1	Control	1.331	1.469^c	1.845	2.279^a,b	1.432^d	1.615^d	1.751^b,c,d	0.404^a,b	0.450^a,b	3.526^b,c,d	4.777^c,d	1.276^e,f	1.229^d,e
Strain 1	Reduced	1.364	1.595^b	1.894	2.394^a	1.533^b,c	1.694^a,b	1.842^a	0.383^d,e,f	0.429^c,d,e	3.434^c,d	4.733^d	1.296^a,b,c	1.250^a,b,c
Strain 2	Control	1.348	1.478^c	1.854	2.377^a	1.442^d	1.624^c,d	1.793^a,b,c	0.405^a	0.458^a	3.471^c,d	4.720^d	1.275^f	1.221^e
Strain 2	Reduced	1.358	1.617^b	1.914	2.277^a,b	1.544^b	1.711^a,b	1.843^a	0.388^c,d,e,f	0.427^d,e	3.370^d	4.813^b,c,d	1.292^a,b,c,d	1.252^a,b
Strain 3	Control	1.265	1.441^c,d	1.812	2.312^a	1.392^e	1.574^d	1.724^d,e	0.393^b,c,d	0.444^a,b,c,d	3.872^a	5.253^a	1.287^c,d,e	1.236^b,c,d,e
Strain 3	Reduced	1.297	1.586^b	1.854	2.288^a,b	1.503^c	1.667^b,c	1.800^a,b,c	0.377^f	0.419^e	3.632^a,b,c	5.193^a,b,c	1.302^a	1.260^a
Strain 4	Control	1.283	1.426^d	1.810	2.314^a	1.392^e	1.578^d	1.740^c,d,e	0.395^a,b,c	0.446^a,b,c	3.744^a,b	5.221^a,b	1.285^d,e,f	1.234^c,d,e
Strain 4	Reduced	1.324	1.598^b	1.838	2.252^a,b	1.519^b,c	1.670^b,c	1.809^a,b	0.380^e,f	0.422^e	3.355^d	4.847^a,b,c,d	1.299^a,b	1.257^a
Strain 5	Control	1.317	1.405^d	1.792	2.073^b	1.381^e	1.575^d	1.691^e	0.392^c,d	0.435^b,c,d,e	3.491^c,d	4.972^a,b,c,d	1.287^c,d	1.244^a,b,c,d
Strain 5	Reduced	1.351	1.683^a	1.896	2.229^a,b	1.582^a	1.730^a	1.848^a	0.391^c,d,e	0.433^b,c,d,e	2.972^e	4.263^e	1.289^b,c,d	1.246^a,b,c,d
SEM		0.0116	0.0093	0.0216	0.0460	0.0077	0.0110	0.0128	0.0024	0.0040	0.0529	0.0917	0.0024	0.0039
P-value	Strain	<0.0001	0.0002	0.036	0.0009	<0.0001	0.0001	0.0002	0.0002	0.035	<0.0001	<0.0001	0.0002	0.035
	Diet	0.0001	<0.0001	0.0001	0.561	<0.0001	<0.0001	<0.0001	<0.0001	<0.0001	<0.0001	0.0004	<0.0001	<0.0001
	Strain × Diet	0.725	<0.0001	0.485	0.026	<0.0001	0.007	0.001	0.003	0.004	0.0003	0.0003	0.0031	0.0081

^a^–^fMeans in a column not sharing a common superscript were different (P < 0.05).

Feed cost/BW on day 55 was calculated by (Feed price day 0–14 × FI day 0–14 + Feed price day 14–28 × FI day 14–28 + Feed price day 28–41 × FI day 28–41 + Feed price day 41–55 × FI day 41–55)/BW on day 55.

The prices for the diets are listed in Table 1.

Abbreviation: FI = feed intake.

SEM = standard error of mean; n = 16, 40, and 8 for treatments of strain, diet, and interaction of strain and diet, respectively.

Feed cost/BW on day 41 was calculated by (Feed price day 0–14 × FI day 0–14 + Feed price day 14–28 × FI day 14–28 + Feed price day 28–41 × FI day 28–41)/BW on day 41.