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

Remus, Aline; Hauschild, Luciano; Corrent, Etienne; Létourneau-Montminy, Marie-Pierre; Pomar, Candido

doi:10.1186/s40104-019-0328-7

Journal of Animal Science and Biotechnology

Table 2 Initial and final animal body composition, growth performance, and nutrient efficiency of growing barrows (25 to 42 kg body weight) fed different levels of threonine (70%, 85%, 100%, 115%, and 130% of the ideal threonine:lysine ratio of 0.65) in an individual precision-feeding (IPF) system or a group phase-feeding (GPF) system

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

Parameter	IPF					GPF						P-value²
Parameter	70	85	100	115	130	70	85	100	115	130	MSE¹	Thr	FS	Thr× FS
Number of observations	10	8	11	10	10	11	10	11	11	11
Initial conditions
Body weight, kg	26.0	26.2	25.6	25.2	26.0	26.7	25.7	25.8	25.7	26.2	0.8	0.40	0.49	0.84
Body protein, kg	3.94	3.96	3.83	3.76	3.93	4.06	4.00	3.91	3.87	3.97	0.17	0.23	0.18	0.99
Body lipids, kg	1.18	1.19	1.16	1.14	1.17	1.21	1.20	1.17	1.16	1.19	0.03	0.16	0.23	1.00
Final conditions, growth performance, and nutrient efficiency
Body weight, kg	39.54	40.45	41.47	41.59	43.45	40.80	42.48	42.06	41.74	42.28	1.09	0.11	0.37	0.57
Body protein, kg	6.59	6.68	6.83	6.94	7.28	6.86	6.95	7.04	6.98	7.12	0.23	0.16	0.31	0.76
Body lipids, kg	2.76	2.75	2.71	2.56	2.61	2.76	2.89	2.73	2.61	2.59	0.23	0.64	0.72	0.99
Average daily feed intake, kg/d	1.44	1.46	1.46	1.63	1.50	1.51	1.40	1.49	1.48	1.41	0.14	0.41	0.35	0.47
Average daily gain, kg/d	0.64	0.67	0.76	0.80	0.83	0.68	0.73	0.78	0.77	0.76	0.04	0.01^†	0.63	0.17
G:F,³kg/kg	0.46	0.47	0.51	0.51	0.56	0.45	0.49	0.52	0.52	0.56	0.04	< 0.001^†	0.64	0.87
SID⁴lysine intake, g/d	11.5	12.3	12.2	13.3	12.9	13.0	12.0	12.8	12.7	12.1	1.3	0.63	0.86	0.22
SID threonine intake, g/d	6.3	7.9	8.9	11.0	11.5	7.1	7.6	9.3	10.2	11.4	0.9	< 0.001^†	0.99	0.33
Threonine efficiency,⁵%	84	68	65	56	54	75	68	65	57	55	0.07	< 0.001^†	0.53	0.46
Lysine efficiency,⁶%	80	78	87	85	93	73	78	88	88	94	0.09	< 0.001^†	0.83	0.77
Protein deposition, g/d	126.2	129.7	141.4	151.1	159.5	130.9	143.1	149.7	148.5	150.2	8.3	< 0.001^†	0.54	0.59
Protein in gain, %	19.0	19.1	19.1	19.2	19.3	19.0	19.2	19.4	19.4	19.6	0.3	0.43	0.25	0.99
Lipid deposition, g/d	74.8	74.1	74.7	68.3	68.4	74.2	81.0	74.4	69.0	66.8	10.1	0.70	0.84	0.99
Nitrogen balance
Crude protein intake, g/d	222.3	238.4	236.2	258.2	248.6	250.2	230.1	247.0	244.6	234.0	19.48	0.56	0.95	0.22
Efficiency of nitrogen retention, %	55.34	54.68	60.53	59.07	64.51	51.25	54.66	61.25	61.08	65.25	4.77	< 0.001^†	0.94	0.80
Nitrogen excretion, g/d	16.34	17.39	14.90	16.17	14.26	18.55	16.60	15.58	15.40	13.41	2.96	0.05^‡	0.91	0.70

¹MSE, maximum standard error
²Thr, level of threonine; FS, feeding system; L × Thr, interaction between level of threonine and feeding system; ^†linear effect for Thr; ^‡tendency for a linear effect for Thr
³G:F, gain:feed ratio
⁴SID, standardized ileal digestible
⁵Threonine (Thr) efficiency = {(PD × 0.037) − [0.313 g Thr/kg dry matter × DFI + (0.0033 g Thr/kg^0.75 d × BW^0.75) + (0.0138 g Thr/kg^0.75 d × BW^0.75)]}/SID Thr intake, where PD is protein deposition, DFI is daily feed intake, and BW is body weight
⁶Lysine (Lys) efficiency = {(PD × 0.069) − [0.330 g Lys/kg dry matter × DFI + (0.0045 g Lys/kg^0.75 d × BW^0.75) + (0.0239 g Lys/kg^0.75 d × BW^0.75)]}/SID Lys intake, where PD is protein deposition, DFI is daily feed intake, and BW is body weight

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ISSN: 2049-1891

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