Table 3. Effects of dietary energy and crude protein levels on body weight, backfat thickness, weaning to estrus interval, and daily feed intake of gestating-lactating sows
Energy CP (%) | ME 13.40 MJ /kg (%) | ME 13.82 MJ/kg (%) | SEM | p-value |
10.5 | 12 | 13.5 | 10.5 | 12 | 13.5 | ME | CP | M × C |
No. of sows | 10 | 10 | 10 | 10 | 9 | 10 | | | | |
Body weight (kg) |
Day 35 | 244.0 | 239.1 | 239.7 | 239.9 | 239.3 | 243.0 | 2.56 | 0.98 | 0.91 | 0.85 |
Day 110 | 259.0 | 254.0 | 252.3 | 252.7 | 254.0 | 259.2 | 2.40 | 0.96 | 0.93 | 0.56 |
Change (d 35-110) | 15.0 | 14.9 | 12.6 | 12.9 | 14.7 | 16.2 | 1.67 | 0.97 | 0.91 | 0.99 |
24 hours. postpartum | 239.6 | 233.4 | 226.2 | 230.3 | 234.4 | 243.1 | 2.57 | 0.57 | 0.97 | 0.12 |
Day 21 of lactation | 238.7 | 241.2 | 231.8 | 230.7 | 235.0 | 243.8 | 2.89 | 0.93 | 0.88 | 0.32 |
Changes (d 0-21) | 0.9 | 7.8 | 5.6 | 0.4 | 0.6 | 0.7 | 1.36 | 0.21 | 0.35 | 0.42 |
Backfat thickness (mm) |
Day 35 | 20.2 | 20.2 | 20.2 | 21.6 | 21.8 | 20.2 | 0.76 | 0.51 | 0.90 | 0.90 |
Day 110 | 20.7 | 21.4 | 21.3 | 23.8 | 22.8 | 22.3 | 0.83 | 0.30 | 0.98 | 0.85 |
Gain (d 35-110) | 0.5 | 1.2 | 1.1 | 2.2 | 1.0 | 2.1 | 0.71 | 0.41 | 0.95 | 0.75 |
24 hours. Postpartum | 20.2 | 18.9 | 18.7 | 23.9 | 22.2 | 20.4 | 0.84 | 0.10 | 0.47 | 0.87 |
Day 21 of lactation | 16.7 | 18.6 | 19.6 | 21.6 | 21.9 | 19.1 | 0.81 | 0.13 | 0.84 | 0.39 |
Changes (d 0-21)1) | −3.4 | −0.3 | 0.9 | −2.3 | −0.3 | −1.3 | 0.46 | 0.73 | 0.03 | 0.31 |
Lactation ADFI (kg/d) | 6.58 | 7.20 | 6.93 | 6.49 | 6.40 | 6.93 | 0.139 | 0.37 | 0.48 | 0.48 |
WEI (d) | 4.61 | 4.61 | 4.94 | 4.72 | 4.93 | 5.00 | 0.087 | 0.37 | 0.35 | 0.82 |
Linear response (p < 0.05) to dietary CP levels when a significant CP effect was detected.
CP, crude protein; ME, metabolizable energy; SEM, Standard error of means; ADFI, average daily feed intake; WEI, weaning to estrus interval.