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

Table 1 Composition and nutrient contents of the basal diet for Pekin ducks from 15 to 42 days of age (as-fed basis)

Ingredients, %	Content	Nutrient levels	Content
Corn	68.40	Metabolizable energy², kcal/kg	2973
Soybean meal	25.60	Crude protein³, %	16.79
Soybean oil	1.80	Methionine³, %	0.28
Dicalcium phosphate	1.75	Methionine + cystine³, %	0.56
Limestone	1.25	Lysine³, %	0.91
Salt	0.30	Threonine³, %	0.65
L-lysine•HCl	0.10	Tryptophan³, %	0.18
Rice hull + DL-methionine	0.30	Calcium², %	0.90
Premix¹	0.50	Total phosphorus², %	0.64
Total	100.00	Non-phytate phosphorus², %	0.38

¹ Supplied per kilogram of total diet: Cu (CuSO₄·5H₂O), 8 mg; Fe (FeSO₄·7H₂O), 60 mg; Zn (ZnO), 60 mg; Mn (MnSO₄·H₂O), 100 mg; Se (Na₂SeO₃), 0.3 mg; I (KI), 0.4 mg; choline chloride, 1000 mg; vitamin A (retinyl acetate), 4000 IU; vitamin D₃ (cholcalciferol), 2000 IU; vitamin E (dl-α-tocopheryl acetate), 20 IU; vitamin K₃ (menadione sodium bisulfate), 2 mg; thiamin (thiamin mononitrate), 2 mg; riboflavin, 10 mg; pyridoxine hydrochloride, 4 mg; cobalamin, 0.02 mg; calcium-D-pantothenate, 20 mg; nicotinic acid, 50 mg; folic acid, 1 mg; and biotin, 0.15 mg.
² Calculated values
³ Analyzed values

ISSN: 2049-1891