Table 4.

Summarized effects of increasing Val:Lys in lactation diets on litter performance

Study	Range of SID Val:Lys, %	Improved litter gain?	Optimal Val:Lys
Richert et al., 1996	70 to 119	Yes	119%
Richert et al., 1997a	75 to 118	Yes	118%
Richert et al., 1997b	70, 112, and 154	Yes	154%
Moser et al., 2000	78 or 128	Yes	128%
Carter et al., 2000	79 to 136	No	79%
Gaines et al., 2006 (Exp. 1)	86 to 121	No	86%
Gaines et al., 2006 (Exp. 2)	70 to 131	No	70%
Devi et al., 2015	81 or 86	No	81%
Craig et al., 2016	77 to 118	No	77%
Strathe et al., 2016	66 to 105	No	66%
Xu et al., 2017	74 to 133	Yes	113%
Greiner et al., 2019	55 to 102	No	55%