. 2020 Aug 10;98(9):skaa255. doi: 10.1093/jas/skaa255

Table 3.

Effect of feeding strategy (St), farm (Fa), and parity (Pa) on calculated lysine and phosphorus supplies and on estimated efficiencies of retention, nitrogen, and phosphorus excretion and feed cost

	Strategy (St)		St × Fa				St × Pa				P-values
	CF	PF	CF-A	CF-B	PF-A	PF-B	CF-P	CF-M	PF-P	PF-M	RSD	St	Fa	Pa	St×Fa	St×Pa
No. of sows	5,039	5,039	2,511	2,528	2,511	2,528	920	4,119	920	4,119
% of L feed⁴	48.6	88.9	48.6	48.6	85.6	92.1	48.6^a	48.6^a	81.3^b	90.5^c	0.35	<0.01	<0.01	0.91	<0.01	<0.01
SID Lys⁴
Intake, g/d	14.1	9.88	12.9^a	15.2^b	9.41^c	10.4^d	12.3^a	14.5^b	9.33^c	10.0^d	0.24	<0.01	<0.01	<0.01	<0.01	<0.01
Intake, g/kg¹	4.80	3.39	4.80^a	4.80^b	3.50^c	3.28^d	4.80^a	4.80^a	3.65^b	3.33^c	0.21	<0.01	<0.01	0.91	<0.01	<0.01
Retention, %	33.3	45.7	33.9^a	32.6^b	44.7^c	46.8^d	42.5	31.2	55.2	43.6	0.35	<0.01	<0.01	<0.01	<0.01	0.47
STTD-P⁴
Intake, g/d	7.32	6.27	6.73^a	7.91^b	5.88^c	6.65^d	6.41^a	7.53^b	5.74^c	6.38^d	0.16	<0.01	<0.01	<0.01	<0.01	<0.01
Intake, g/kg¹	2.50	2.15	2.50^a	2.50^b	2.19^c	2.10^d	2.50^a	2.50^a	2.24^b	2.12^c	0.11	<0.01	<0.01	0.91	<0.01	<0.01
Retention, %	26.2	30.7	26.7^a	25.6^a	30.9^b	30.5^c	27.5^a	25.9^b	30.2^a	30.8^c	0.61	<0.01	<0.01	<0.01	0.04	<0.01
Crude protein⁴
Intake, g/d	355	316	326^a	384^b	293^c	338^d	311^a	365^b	283^c	323^d	0.14	<0.01	<0.01	<0.01	<0.01	<0.01
Intake, g/kg¹	121	108	121^a	121^b	109^c	107^d	121^a	121^a	110^b	107^c	0.07	<0.01	<0.01	0.91	<0.01	<0.01
Retention, %	20.0	21.9	20.4^a	19.6^b	22.0^c	21.9^d	25.3	18.8	27.2	20.8	0.40	<0.01	<0.01	<0.01	<0.01	0.21
Total P⁴
Intake, g/d	14.5	12.5	13.3^a	15.6^b	11.7^c	13.4^d	12.7^a	14.9^b	11.3^c	12.8^d	0.15	<0.01	<0.01	<0.01	<0.01	<0.01
Intake, g/kg¹	4.94	4.28	4.94	4.94	4.33	4.23	4.94	4.94	4.40	4.25	0.08	<0.01	<0.01	<0.01	0.14	0.44
Retention, %	13.5	15.3	13.5^a	13.0^b	15.5^c	15.1^a	13.9^a	13.1^b	15.3^c	15.3^c	0.60	<0.01	<0.01	<0.01	<0.01	<0.01
Excretion per gestation⁴
N, kg/sow²	30.0	25.0	27.3^a	32.7^b	23.2^c	26.9^d	25.8^a	30.9^b	22.6^c	25.6^a	0.21	<0.01	<0.01	<0.01	<0.01	<0.01
P, kg/sow³	1.43	1.21	1.31^a	1.56^b	1.12^c	1.30^d	1.24^a	1.48^b	1.09^c	1.24^d	0.17	<0.01	<0.01	<0.01	<0.01	<0.01
Feed cost, €/sow/ gestation⁵	63.7	61.4	58.5^a	68.8^b	56.6^c	66.2^d	55.7^a	65.4^b	54.1^c	63.0^d	0.13	<0.01	<0.01	<0.01	<0.01	<0.01

¹With diets formulated at 13 MJ ME/kg. ²L and H diets contained 104 and 137 g of crude protein per kilogram, respectively. ³L and H diets contained 4.10 and 5.73 g of total phosphorus per kilogram, respectively. ⁴AA and mineral requirements were calculated using a factorial approach on the basis of simulated protein and mineral retention, in the same way as performed in InraPorc (Dourmad et al., 2008) or NRC (2012). This is also the case for the mineral and protein retention used for the determination of nutrient balance and excretion. Conversely, the data relative to the nutrient and feed supplies corresponds to the amounts that would have been supplied when applying the DSS in practice. ⁵Estimated feed costs based on average prices of feed ingredients observed in France over the first semester 2019 (IFIP, 2019).