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Table 3 Performance of litter and sow fed high crude protein (HCP; 192.4 g/kg crude protein) and low crude protein (LCP; 140.0 g/kg crude protein) diets and exposed to thermal neutral and heat stress conditionsa

From: Effect of dietary near ideal amino acid profile on heat production of lactating sows exposed to thermal neutral and heat stress conditions

Item Thermal neutral Heat stress
HCP LCP SEMb P-value HCP LCP SEMb P-value
Number of sowsc 6 6 6 6
Parity 3 3 3 4
Wean day 19 18 19 17
Sow ADFId, kg/d
 Overall 6.47 6.01 0.24 0.295 6.47 5.88 0.24 0.185
 Early 5.66 5.20 0.24 0.308 5.73 5.43 0.24 0.505
 Peak 7.36 6.93 0.24 0.347 7.36 6.83 0.24 0.252
Sow BW, kg
 Day 1 217.7 214.0 15.0 0.869 222.0 249.8 15.0 0.220
 Day 10 220.2 211.4 13.7 0.669 223.7 247.5 13.7 0.253
 Wean 209.7 206.7 14.5 0.878 221.4 237.2 14.5 0.422
Sow BW changed, g/d
 Overall − 433.6 − 426.8 188.5 0.982 −35.6 −790.6 188.5 0.023
 Early 120.0 −154.6 128.6 0.177 83.9 − 142.8 128.6 0.262
 Peak − 553.7 − 272.2 128.6 0.167 − 119.5* − 647.8 128.6 0.014
Sow back fat, mm
 Day 1 14.4 14.5 2.2 0.974 15.0 15.5 2.2 0.834
 Day 10 13.7 13.4 1.8 0.892 14.7 14.6 1.8 0.964
 Wean 12.6 11.3 2.0 0.496 13.5 13.8 2.0 0.898
Sow back fat change, mm/d
 Overall −0.100 −0.191 0.038 0.246 −0.077 −0.102 0.038 0.749
 Early −0.043 −0.074 0.039 0.625 −0.015 −0.055 0.039 0.519
 Peak −0.057 −0.118 0.039 0.336 −0.062 −0.047 0.039 0.803
Litter size
 Day 1 12 11 12 11
 Day 10 11 11 11 11
 Wean 11 11 11 10
Piglet daily gain, g/d
 Overall 259.7 255.2 34.3 0.849 220.3 230.0 34.3 0.683
 Early 251.6 249.0 33.9 0.931 216.7 245.8 33.9 0.341
 Peak 268.8 268.2 33.9 0.985 232.2 231.2 33.9 0.975
Litter weight gain, kg/d
 Overall 2.94 2.81 0.29 0.650 2.49 2.37 0.29 0.663
 Early 2.91 2.74 0.29 0.631 2.56 2.57 0.29 0.970
 Peak 2.98 2.96 0.29 0.962 2.49 2.35 0.29 0.686
  1. aData are least squares means. Overall: d 1-wean; early: d 1–10; peak: d 10-wean
  2. bMaximum value of the standard error of the means
  3. cTwo sows were weaned on days 15 (LCP under TN) and 16 (LCP under HS) and their performance data (feed intake, litter weight gain, piglet ADG for day 10 to weaning) were excluded from the analyses
  4. dThe main effect of lactation stage (early vs. peak) was significant for sow body weight (BW) change and average daily feed intake (ADFI)
  5. *Within the same diet, environments differed (P < 0.05)
  6. Within the same diet, environments tended to differ for BW change at peak lactation (P = 0.052)