. 2023 Jul 11;102(10):102897. doi: 10.1016/j.psj.2023.102897

Table 5.

Effect of dietary GRE supplementation on growth performance of broiler chicks (d 22–42).

Day 22–42 (parameters measured)²					Cumulative: Day 1–42 (parameters measured)²
Treatments¹	Body weight (BW, kg/bird)³	Body weight gain (BWG, kg/bird)	Feed intake (FI, kg/bird)	FCR⁴ (kg:kg)	BWG (kg/bird)	FI (kg/bird)	FCR⁴ (kg:kg)
CON	3.266^a	2.453^ab	4.403	1.797^b	3.230^ab	5.490	1.702^b
MX	3.325^a	2.533^ab	4.428	1.747^b	3.310^ab	5.500	1.662^b
GRE-0.375%	3.376^a	2.580^a	4.522	1.750^b	3.375^a	5.637	1.669^b
GRE-0.75%	3.273^a	2.458^ab	4.503	1.832^b	3.260^ab	5.597	1.717^b
GRE-1.5%	3.143^ab	2.348^bc	4.260	1.814^b	3.108^bc	5.327	1.713^b
GRE-3%	2.923^b	2.191^c	4.270	1.952^a	2.901^c	5.278	1.821^a
SEM	0.057	0.059	0.093	0.024	0.072	0.101	0.020
P-value	< 0.0001	< 0.0001	0.2385	<0.0001	<0.0001	0.1068	< 0.0001

^a-c

Mean values bearing different superscript letters within a column are significantly different (P < 0.05). n = 12 birds per treatment.

Treatment CON consisted of chicks fed unmedicated corn–soybean meal (SBM) basal without GRE; Treatment MX consisted of chicks given unmedicated corn–SBM basal into which bacitracin methylene disalicylate (BMD) was added at 0.055g/kg diet; Treatment GRE-0.375% consisted of chicks given unmedicated corn-SBM basal into which GRE was added at 0.375% level; Treatments GRE-0.75%, GRE-1.5%, and GRE-3% consisted of chicks that were given diets similar to GRE-0.375% consisted of chicks that were given diets similar to GRE1 at 0.75%, 1.5%, and 3%, respectively.

Values represent the mean of 6 replicate pens per treatment.

Values are based only on weight of live birds.

⁴

FCR = feed conversion ratio calculated as feed-to-gain ratio and adjusted for mortality by including the gains of dead birds in the calculations.