Responses to dietary levels of methionine in broilers medicated or vaccinated against coccidia under Eimeria tenella-challenged condition

Table 4 Growth performance of chickens after indicated treatments¹

	Medicated groups			Vaccinated groups			P value
Met² concentrations:	0.45%	0.56%	0.68%	0.45%	0.56%	0.68%	Anticoccidial program	Met levels	Anticoccidial program × Met levels
Initial BW (g)	466 ± 12	470 ± 14	460 ± 8	470 ± 10	463 ± 11	466 ± 7	0.754	0.499	0.303
Final BW (g)	1187 ± 10^d	1221 ± 19^bc	1212 ± 12^c	1244 ± 14^a	1230 ± 0.17^b	1196 ± 13^d	0.004	0.009	<.001
ADFI (g/d)	87.23 ± 0.93^b	87.53 ± 1.66^b	86.69 ± 1.11^b	89.42 ± 0.94^a	89.47 ± 2.56^a	86.47 ± 2.01^b	0.027	0.014	0.166
ADG (g/d)	36.06 ± 0.32^c	37.58 ± 0.94^b	37.61 ± 0.76^b	38.73 ± 0.93^a	38.36 ± 1.11^ab	36.50 ± 0.72^c	0.008	0.035	<.001
F/G	2.42 ± 0.02^a	2.33 ± 0.03^b	2.31 ± 0.04^b	2.31 ± 0.03^b	2.33 ± 0.03^b	2.37 ± 0.05^b	0.188	0.032	<.001

¹An anticoccidial drug (narasin, 60 mg/kg diet) was added to diets in medicated groups, and an anticoccidial 7-valent live vaccine was inoculated in vaccinated groups
²Met methionine, BW body weight, ADFI average daily feed intake, ADG average daily gain, F/G feed to gain ratio
^a,b,c,dThe data of the same row not sharing a lowercase letter differ (P < 0.05; n = 180)

ISSN: 1746-6148