. 2021 Mar 4;7(2):488–495. doi: 10.1016/j.aninu.2020.07.008

Table 4.

Effects of dietary treatments on body weight and performance of broiler chickens at the different phases of the study¹.

Diet²	Treatment³	BW, g			0 to 14 d			14 to 29 d			29 to 42 d
Diet²	Treatment³	14 d	29 d	42 d	BWG, g	FI, g	FCR⁴, g/g	BWG, g	FI, g	FCR, g/g	BWG, g	FI, g	FCR, g/g
PC		277	1,064	2,100	242	360	1.485	787	1,196	1.526	1,036^a	1,898	1.837
NC1		259	995	1,982	225	336	1.509	736	1,133	1.563	987^b	1,805	1.830
NC2		235	879	1,783	201	315	1.581	644	1,038	1.623	904^c	1,675	1.855
	-STBIO	241	880	1,798	207	321	1.566	639	1,033	1.627^a	918^b	1,696	1.850
	+STBIO	273	1,078	2,112	239	353	1.485	805	1,212	1.514^b	1,034^a	1,889	1.832
PC	-STBIO	284^ab	1,026^b	2,012^b	249^ab	363^a	1.453^c	742^b	1,169^bc	1.580	987	1,859^bc	1.889
PC	+STBIO	270^bc	1,102^a	2,188^a	236^bc	356^ab	1.518^bc	832^a	1,224^ab	1.472	1,086	1,937^ab	1.784
NC1	-STBIO	231^d	841^c	1,757^c	197^d	311^c	1.581^ab	610^c	1,006^d	1.659	915	1,658^d	1.813
NC1	+STBIO	287^a	1,148^a	2,207^a	253^a	362^a	1.437^c	861^a	1,261^a	1.467	1,059	1,953^a	1.847
NC2	-STBIO	209^e	774^d	1,626^d	175^e	290^c	1.663^a	565^c	923^e	1.642	852	1,572^d	1.847
NC2	+STBIO	261^c	984^b	1,940^b	227^c	340^b	1.500^bc	723^b	1,153^c	1.604	957	1,778^c	1.863
SEM		5	21	33	5	5	0.016	9	11	0.013	8	13	0.011
P-Diet		<0.001	<0.001	<0.001	<0.001	<0.001	0.023	<0.001	<0.001	0.078	<0.001	<0.001	0.789
P-Treatment		<0.001	<0.001	<0.001	<0.001	<0.001	0.007	<0.001	<0.001	0.002	<0.001	<0.001	0.552
P-Interaction		<0.001	<0.001	<0.001	0.001	0.001	0.004	0.001	<0.001	0.199	0.145	0.004	0.136

BW = body weight; BWG = body weight gain; FI = feed intake; FCR = feed conversion ratio; SEM = standard error of the mean.

^{a – e} Means with a different superscript letter differ (P < 0.05) based on t-test Student honestly significant difference test for the interaction.

Means were obtained from 8 replicate pens of 25 birds per replicate pen.

Diet: PC, positive control diet; NC1, negative control 1, with a 50 kcal/kg AME reduction; NC2, negative control 2, with a 50 kcal/kg apparent metabolizable energy (AME) reduction and reducing amino acids by 3%.

Treatment: (−) is the control treatment; (+) is the basal diet supplemented with 100 g/t of the stimbiotic, a combination of xylanase and xylo-oligosaccharide (STBIO).

⁴

Corrected for the weight of dead birds.