Table 5.

Effects of increasing standardized ileal digestible (SID) lysine in lactation diets on sow performance, Exp. 1¹

	Standardized ileal digestible Lys, %					Probability, P <
Item	0.80	0.95	1.10	1.25	SEM	Linear	Quadratic
BW, kg
d 110	194.9	196.0	195.2	195.7	2.97	0.929	0.894
d 0	184.3	184.0	183.7	185.2	2.50	0.835	0.667
d 10	182.3	181.8	182.8	183.9	2.43	0.530	0.716
Wean	179.2	178.2	180.6	181.8	2.49	0.335	0.738
BW loss, kg
d 0 to 10	–2.03	–2.23	–1.43	–1.31	0.958	0.439	0.860
d 10 to wean	–3.08	–2.83	–2.28	–2.08	0.878	0.318	0.971
d 0 to wean	–5.12	–5.06	–3.76	–3.38	1.377	0.235	0.899
ADFI, kg
d 0 to 10	4.66	4.44	4.50	4.64	0.127	0.952	0.130
d 10 to wean	6.36	6.27	6.21	6.31	0.173	0.743	0.573
d 0 to wean	4.99	4.74	4.90	4.97	0.136	0.821	0.226
Total Lys intake2, g/d	50.4	53.5	61.0	71.2	1.61	0.001	0.016
SID Lys intake3, g/d	39.9	45.0	53.9	62.1	1.35	0.001	0.243
BF loss, mm
d 0 to 10	–0.99	–1.62	–0.95	–1.09	0.249	0.549	0.306
d 10 to wean	–1.48	–0.94	–1.23	–0.60	0.265	0.087	0.874
d 0 to wean	–2.51	–2.53	–2.18	–1.65	0.329	0.046	0.410
Lactation length, d	18.7	18.8	18.6	18.4	0.34	0.946	0.534
Wean-to-estrus interval, d	5.00	4.91	4.97	4.61	0.45	0.691	0.800
Females bred by 7 d after weaning, %	89.9	89.9	94.2	100.0	6.05	0.975	0.977
d 30 conception rate4, %	87.5	96.0	96.3	78.8	8.00	0.537	0.051
Farrowing rate5, %	79.2	88.0	96.0	74.8	8.03	0.789	0.290

¹A total of 111 primiparous sows (DNA 241, DNA Genetics, Columbus, NE) across 4 farrowing groups were used in a 21-d trial with 27 to 29 sows per dietary treatment.

²Calculated using analyzed Lys values and ADFI.

³Calculated using formulated SID Lys values and ADFI.

⁴Number of sows confirmed pregnant on d 30 post mating divided by number of sows bred.

⁵Number of sows farrowed divided by number of sows bred by d 21 after weaning.