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

Table 4.

Effect of dietary GRE supplementation on growth performance of broiler chicks (d 1–21).⁵

	Day 1–7 (parameters measured)²				Day 8–21 (parameters measured)²
Treatments¹	Body weight (BW, kg/bird)³	Body weight gain (BWG, kg/bird)	Feed intake (FI, kg/bird)	FCR⁴ (kg:kg)	BW (kg/bird)³	BWG (kg/bird)	FI (kg/bird)	FCR⁴ (kg:kg)
CON	0.137^ab	0.097^ab	0.118	1.218^a	0.819^a	0.782^a	1.086^ab	1.396
MX	0.142^ab	0.108^ab	0.120	1.108^ab	0.816^a	0.766^ab	1.072^ab	1.400
GRE-0.375%	0.145^a	0.113^a	0.125	1.106^ab	0.829^a	0.785^a	1.116^a	1.423
GRE-0.75%	0.146^a	0.112^a	0.121	1.080^b	0.823^a	0.778^a	1.095^a	1.401
GRE-1.5%	0.138^ab	0.105^ab	0.117	1.120^ab	0.796^ab	0.750^ab	1.061^ab	1.423
GRE-3%	0.125^b	0.092^b	0.111	1.210^a	0.735^b	0.695^b	1.006^b	1.448
SEM	0.004	0.004	0.004	0.028	0.019	0.0207	0.155	0.014
P-value	0.0273	0.0042	0.3341	0.0043	0.0131	0.0105	0.0146	0.5069

^a-b

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 0.055 g/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% 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.

⁵

Cummulative = growth performance data from d 1 to 21