Dietary methionine deficiency stunts growth and increases fat deposition via suppression of fatty acids transportation and hepatic catabolism in Pekin ducks

Table 2 Effects of dietary methionine level on growth performance of Pekin ducks from 15 to 42 days of age

Dietary Met level, %	ADG, g	ADFI, g	FCR	Met intake, g/d/bird	Met intake/ADG
0.28	86.7±2.6^b	186.2±7.9	2.15±0.06^a	0.52±0.02^e	5.95±0.16^e
0.35	89.1±3.6^a,b	176.7±10.2	1.98±0.06^b	0.62±0.04^d	6.97±0.20^d
0.43	93.4±2.6^a	179.1±8.2	1.92±0.04^c	0.76±0.03^c	8.19±0.16^c
0.50	90.8±3.0^a,b	175.5±7.2	1.94±0.04^b,c	0.88±0.04^b	9.70±0.19^b
0.58	91.8±4.6^a	177.0±9.6	1.93±0.04^b,c	1.02±0.06^a	11.12±0.25^a
P value
Met	0.024	0.259	<0.001	<0.001	<0.001
Met linear response	0.014		<0.001	<0.001	<0.001
Met quadratic response	0.077		<0.001	0.489	0.001

^a–e Means within a column with no common superscripts differ significantly (P < 0.05)
Values are the means of 6 replicates of 5 ducks
ADG, average daily gain; ADFI, average daily feed intake; FCR, feed conversion ratio (feed: gain); Met, methionine

ISSN: 2049-1891