Table 2.

Live performance parameters of broilers in ovo inoculated with different concentrations of GalliPro Hatch (GH) Enterococcus faecium–based probiotic on day 18 of incubation: MV alone (Marek's vaccine with not addition of probiotic), 10⁵ cfu GH (MV + 10⁵ cfu GH/50 μL), 10⁶ cfu GH (MV + 10⁶ cfu GH/50 μL), and 10⁷ cfu GH (MV + 10⁷ cfu GH/50 μL).¹

Day of the grow-out	Performance parameter	MV alone	105 cfu GH	106 cfu GH	107 cfu GH	P value	SEM
Day 0–7	Feed intake (kg)	0.153a	0.138b	0.143a,b	0.141b	0.049	0.0037
	BW gain (kg)	0.111	0.113	0.113	0.112	0.985	0.0043
	FCR	1.384a	1.273b	1.265b	1.265b	0.014	0.0264
Day 7–14	Feed intake (kg)	0.355	0.339	0.340	0.379	0.328	0.0166
	BW gain (kg)	0.238	0.222	0.224	0.266	0.224	0.0165
	FCR	1.548	1.563	1.531	1.438	0.228	0.0469
Day 14–21	Feed intake (kg)	0.576	0.532	0.555	0.593	0.183	0.0202
	BW gain (kg)	0.400a,b	0.378b	0.400a,b	0.446a	0.045	0.0173
	FCR	1.324	1.290	1.277	1.213	0.068	0.0300
Day 0–21	Feed intake (kg)	1.083	1.006	1.035	1.114	0.148	0.0356
	BW gain (kg)	0.752	0.706	0.734	0.821	0.073	0.0320
	FCR	1.450a	1.433a	1.422a,b	1.360b	0.049	0.0238

Means in a column not sharing a common superscript are different (P ≤ 0.05).

Abbreviation: FCR, feed conversion ratio.

¹Means are calculated from 10 replicate values using one randomly chosen bird per pen and each pen as the experimental unit (10 pens/treatment,16 birds/pen; 160 total birds/treatment).