Figure 1.
Figure 1.

Nursery pig ADG dose response curves dependent on standardized ileal digestible (SID) Lys. Broken-line linear Estimated breakpoint 1.45% SID Lys, [95% CI: (1.31, 1.58)]; BIC = 305.8. QP Estimated > 1.60% SID Lys that maximized ADG [95% CI: (1.47, > 1.60)]; 95% of Maximum: 1.43% SID Lys; BIC = 306.8. A total of 300 nursery pigs (PIC 327 × 1,050, initially 6.7 kg BW) were used in a 28-d growth trial with 5 pigs per pen and 10 pens per treatment. Pigs were weaned at approximately 21 d, fed a common starter diet for 6 d post-weaning, then fed dietary treatments. Quadratic polynomial (QP), broken-line linear (BLL), and broken-line quadratic (BLQ) models were fit to characterize the SID Lys dose response curve.

 


Figure 2.
Figure 2.

Nursery pig feed efficiency (G:F) dose response curves dependent on standardized ileal digestible (SID) Lys. Quadratic polynomial Estimated > 1.60% SID Lys that maximized G:F; [95% CI: (1.53, > 1.60)]; 95% of Maximum: 1.41% SID Lys; BIC = 629.6. Broken-line linear estimated breakpoint: 1.45% SID Lys; [95% CI: (1.35, 1.54)]; BIC = 627.7. A total of 300 nursery pigs (PIC 327 × 1,050, initially 6.7 kg BW) were used in a 28-d growth trial with 5 pigs per pen and 10 pens per treatment. Pigs were weaned at approximately 21 d, fed a common starter diet for 6 d post-weaning, then fed dietary treatments. Quadratic polynomial (QP), broken-line linear (BLL), and broken-line quadratic (BLQ) models were fit to characterize the SID Lys dose response curve.

 


Figure 3.
Figure 3.

Nursery pig ADG dose response curve dependent on standardized ileal digestible (SID) Val:Lys ratio. Broken-line linear Estimated breakpoint: 62.9% SID Val:Lys, [95% CI: (52.2, 73.7)]. A total of 280 nursery pigs (PIC 327 × 1,050, initially 6.5 kg BW) were used in a 28-d growth trial with 5 pigs per pen and 8 pens per treatment. Pigs were weaned at approximately 21 d, fed a common starter diet for 5 d post-weaning, then fed dietary treatments. Quadratic polynomial (QP), broken-line linear (BLL), and broken-line quadratic (BLQ) models were fit to estimate the dose response to feeding increasing SID Val:Lys.

 


Figure 4.
Figure 4.

Nursery pig ADFI dose response curve dependent on standardized ileal digestible (SID) Val:Lys ratio. Quadratic polynomial estimated 73.7% SID Val:Lys that maximized ADFI [95% CI: (61, > 85)]; 99% of Maximum: 68.0% SID Val:Lys. A total of 280 nursery pigs (PIC 327 × 1,050, initially 6.5 kg BW) were used in a 28-d growth trial with 5 pigs per pen and 8 pens per treatment. Pigs were weaned at approximately 21 d, fed a common starter diet for 5 d post-weaning, then fed dietary treatments. Quadratic polynomial (QP), broken-line linear (BLL), and broken-line quadratic (BLQ) models were fit to estimate the dose response to feeding increasing SID Val:Lys.

 


Figure 5.
Figure 5.

Nursery pig feed efficiency (G:F) dose response curve dependent on standardized ileal digestible (SID) Val:Lys ratio. Quadratic polynomial estimated 71.7% SID Val:Lys that maximized G:F [95% CI: (58, > 85)]; 99% of Maximum: 64.6% SID Val:Lys. A total of 280 nursery pigs (PIC 327 × 1,050, initially 6.5 kg BW) were used in a 28-d growth trial with 5 pigs per pen and 8 pens per treatment. Pigs were weaned at approximately 21 d, fed a common starter diet for 5 d post-weaning, then fed dietary treatments. Quadratic polynomial (QP), broken-line linear (BLL), and broken-line quadratic (BLQ) models were fit to estimate the dose response to feeding increasing SID Val:Lys.