Pigs receiving daily tailored diets using precision-feeding techniques have different threonine requirements than pigs fed in conventional phase-feeding systems

Table 1 Ingredient and chemical composition (as-fed basis) of the experimental feeds (A1, A2, B1, and B2)

Item	A1	A2	B1	B2
Ingredients g/kg
Corn	533	538	537	538
Soybean meal (48%)	173	173	–	–
Wheat	150	150	100	100
Canola meal	47	47	–	–
Corn gluten meal + linseed meal^a	33	33	–	–
Corn starch	–	–	156.3	156.3
Fat	16	16	35	35
Oat hulls	–	–	143	143
Limestone	12	12	8	8
Monocalcium phosphate	10	10	8	8
Salt	5.50	5.50	4.80	4.80
Anti-mould	1.00	1.00	1.00	1.00
Choline chloride (75%)	0.20	0.20	0.20	0.20
Lysine sulfate (70%)	6.70	6.70	2.80	2.80
l-threonine	4.50	–	1.20	–
dl-methionine	2.30	2.30	0.20	0.20
l-valine (96.5%)	2.10	2.10	0.20	0.20
Vitamin mineral premix^b	2.00	2.00	2.00	2.00
l-tryptophan	1.10	1.10	0.30	0.30
l-isoleucine	0.70	0.70	0.20	0.20
Chemical composition, %
Dry matter	90.85	91.25	92.99	92.67
Crude fat	6.79	6.74	7.88	8.44
Crude protein	19.85	19.88	7.5	6.88
Acid detergent fibre	3.87	4.02	6.32	6.51
Neutral detergent fibre	8.80	8.63	13.58	14.12
Total calcium	0.72	0.72	0.50	0.49
Total phosphorus	0.64	0.64	0.40	0.40
Digestible phosphorus^c	0.35	0.35	0.27	0.27
SID^d isoleucine	0.67	0.69	0.22	0.21
SID leucine	1.34	1.39	0.64	0.59
SID lysine	1.07	1.07	0.34	0.33
SID methionine	0.53	0.53	0.16	0.14
SID methionine + cysteine	0.72	0.72	0.24	0.20
SID phenylalanine	0.75	0.77	0.28	0.26
SID serine	0.80	0.80	0.30	0.26
SID threonine	0.98	0.58	0.31	0.19
SID valine	0.89	0.89	0.29	0.27
Calculated net energy, MJ/kg	13.43	13.49	13.63	13.65

^aMix of corn gluten meal and linseed meal (Shur-Gain Canada)
^bSupplied per kilogram of diet (as-fed basis): vitamin A, 11,400 IU; vitamin D, 1140 IU; vitamin E, 35 IU; vitamin K, 2 mg; vitamin B₁₂, 30 μg; niacin, 20 mg; pantothenic acid, 15 mg; pyridoxine, 2 mg; thiamine, 2 mg; copper, 122 mg; iodine, 0.3 mg; iron, 100 mg; manganese, 63 mg; selenium, 0.3 mg; and zinc, 152 mg
^cDigestible phosphorus, standardized ileal digestible amino acids, and metabolizable energy were estimated from the analyzed total amino acid and crude energy content in feed and from values in the INRA-AFZ tables [19]
^dSID, standardized ileal digestible

ISSN: 2049-1891