Table 3.
Evaluation of lactating primiparous and multiparous sow and litter performance as dietary standardized ileal digestible (SID) Threonine:Lys ratio increases in sow lactation diets
| Parameter | SID Thr:Lys ratio | |||||||
|---|---|---|---|---|---|---|---|---|
| 52.0 | 60.0 | 68.0 | 76.0 | 84.0 | SEM | Trt2 | Quadratic | |
| Sow | ||||||||
| Number of sows | 52 | 62 | 61 | 57 | 58 | |||
| SID Lys intake, g/d | 48.7 | 52.6 | 46.7 | 44.8 | 44.6 | |||
| Total Thr intake, g/d | 29.3 | 30.1 | 32.7 | 33.7 | 35.9 | |||
| SID Thr intake, g/d | 21.8 | 23.8 | 27.6 | 29.6 | 32.7 | 0.60 | 0.001 | 0.001 |
| ADFI, kg | 4.73 | 4.57 | 4.67 | 4.55 | 4.60 | 0.10 | 0.55 | 0.001 |
| Sow 48 h weight, kg | 210.35 | 216.09 | 212.84 | 214.64 | 210.07 | 4.81 | 0.84 | 0.89 |
| Sow wean weight, kg | 196.02 | 199.50 | 197.05 | 200.79 | 196.89 | 4.53 | 0.92 | 0.82 |
| Weight change, % | −6.44 | −7.89 | −7.35 | −6.19 | −5.81 | 1.00 | 0.45 | 0.004 |
| Bred by 10 d, % | 90.3 | 95.6 | 91.8 | 87.7 | 84.3 | 0.03 | 0.05 | 0.02 |
| Weaning-to-estrus, d | 5.42 | 4.42 | 4.55 | 4.46 | 4.84 | 0.30 | 0.07 | 0.12 |
| Subsequent total born, n | 12.67 | 13.90 | 14.45 | 12.86 | 12.99 | 0.56 | 0.05 | 0.02 |
| Piglet | ||||||||
| Number of piglets started/sow, n | 13.19 | 13.50 | 13.54 | 13.68 | 13.75 | 0.21 | 0.29 | >0.10 |
| Number of piglets weaned/sow, n | 11.71 | 11.88 | 12.29 | 12.13 | 11.95 | 0.29 | 0.56 | >0.10 |
| Pig ADG, kg/d | 0.223 | 0.219 | 0.223 | 0.224 | 0.219 | 0.005 | 0.87 | 0.001 |
| Daily litter ADG, kg/d | 2.67 | 2.67 | 2.78 | 2.77 | 2.68 | 0.077 | 0.63 | 0.001 |
| Removal, % | 11.01 | 12.12 | 9.18 | 11.55 | 13.27 | 1.63 | 0.36 | >0.10 |