. 2021 Oct 5;8:26–37. doi: 10.1016/j.aninu.2021.07.007

Table 3.

Effects of PE and NE challenge on the performance in broilers at different phases.¹

Item	UC	NE challenged²					SEM	P-value
Item	UC	CC	PE	AM	FAP	HAP	SEM	P-value
Starter phase (d 0 to 9)
BWG, g	220	212	213	215	211	213	2	0.139
FI, g	256	255	256	254	256	254	2	0.913
FCR	1.180	1.190	1.204	1.189	1.204	1.207	0.008	0.126
Livability, %	98.8	98.8	100	98.8	97.5	99.4	1	0.289
Grower phase (d 9 to 21)
BWG, g	736^a	497^d	501^d	671^b	670^b	569^c	8	<0.001
FI, g	1,021^a	870^bc	835^c	994^a	978^a	896^b	13	<0.001
FCR	1.388^e	1.734^a	1.688^b	1.472^d	1.458^d	1.575^c	0.010	<0.001
Livability, %	100^a	81.8^c	85.7^bc	100^a	98.5^a	91.6^ab	2	<0.001
Finisher phase (d 21 to 35)
BWG, g	1,293^c	1,299^c	1,312^bc	1,386^a	1,384^a	1,359^ab	13	<0.001
FI, g	2,299^b	2,319^b	2,220^c	2,413^a	2,392^a	2,344^ab	24	<0.001
FCR	1.760^a	1.747^ab	1.712^c	1.741^ab	1.728^bc	1.726^bc	0.010	0.026
Livability, %	99.1	100	97.8	100	99.0	98.8	1	0.640
Overall period (d 0 to 35)
BWG, g	2,262^a	2,008^c	2,015^c	2,270^a	2,261^a	2,136^b	18	<0.001
FI, g	3,575^ab	3,439^c	3,320^d	3,661^a	3,622^a	3,494^bc	33	<0.001
FCR	1.581^e	1.681^a	1.645^b	1.613^cd	1.602^de	1.636^bc	0.007	<0.001
Livability, %	98.1^a	83.1^c	88.8^bc	98.8^a	95.6^a	93.8^ab	2	<0.001

BWG = body weight gain; FI = feed intake; FCR = feed conversion ratio; NE = necrotic enteritis; PE = plant extract.

^{a – d} Values in a row with no common superscripts differ significantly (P < 0.05). Mean values are based on 20 birds per replicate and 8 replicates per treatment.

UC, unchallenged control; CC, challenged control; PE, plant extract; AM, antimicrobial (narasin and nicarbazin; 50 ppm each active compound); FAP, full dose of AM plus PE; HAP, half dose of AM plus PE.

Challenged birds were orally gavaged with Eimeria spp. on d 9 and Clostridium perfringens on d 14.