Table 3.

Effects of increasing oocysts doses of mixed E. maxima, E. acervulina, and E. tenella on growth performance of broilers (day 13–19).

Items1	Con	Low	Med-low	Med-high	High	SEM	Linear	Quadratic
BW	768 ± 6a	668 ± 6b	644 ± 10b	605 ± 8c	588 ± 12c	12	<0.0001	<0.0001
BWG	370 ± 6a	270 ± 6b	243 ± 11c	205 ± 7d	189 ± 13d	12	<0.0001	<0.0001
FI	547 ± 13a	481 ± 8b	440 ± 7c	438 ± 11c	427 ± 16c	10	<0.0001	0.0023
FCR	1.48 ± 0.05a	1.79 ± 0.03a,b	1.83 ± 0.08b,c	2.15 ± 0.09c	2.32 ± 0.22c	0.07	<0.0001	0.9787

N = 6.

The study evaluated the effects of graded challenge of Eimeria spp. on growth performance and gastrointestinal health of broiler chickens. Birds were challenged with Eimeria spp. on day 13. (Low, 6,250 oocysts of E. maxima, 6,250 oocysts of E. tenella, and 31,250 oocysts of E. acervulina; Med-low, 12,500 oocysts of E. maxima, 12,500 oocysts of E. tenella, and 62,500 oocysts of E. acervulina; Med-high, 25,000 oocysts of E. maxima, 25,000 oocysts of E. tenella, and 125,000 oocysts of E. acervulina; High, 50,000 oocysts of E. maxima, 50,000 oocysts of E. tenella, and 250,000 oocysts of E. acervulina).

¹BW, body weight (day 19); BWG, body weight gain (day 13–19); FI, feed intake (day 13–19); FCR, feed conversion rate (day13–19); Con, Control; Low, the low challenge dose; Med-low, the medium-low challenge dose; Med-high, the medium-high challenge dose; High, the high challenge dose.