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Table 5 Milk yield and composition of sows 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
No. of sows 6 6 6 6
Early lactationc
 Yield, kg/d 9.1 9.1 1.4 0.987 7.8 9.0 1.4 0.480
 True protein, % 4.04 3.89 0.13 0.532 4.10 3.71 0.13 0.105
 Urea-N, mg/dL 12.95 3.93 1.89 < 0.001 11.05 2.13 1.89 < 0.001
 N, % 0.646 0.614 0.020 0.381 0.653 0.583 0.020 0.063
 Energy, kJ/g 461.1 491.6 26.4 0.257 439.7 500.8 26.4 0.032
 Lactose, % 5.70 5.64 0.12 0.562 5.58 5.61 0.12 0.811
 Fat, % 6.80 7.69 0.67 0.218 6.29 8.04 0.67 0.021
Peak lactationc
 Yield, kg/d 13.8 15.5 1.4 0.328 12.7 13.2 1.4 0.763
 True protein, % 4.15 3.84 0.13 0.184 3.94 3.68 0.13 0.271
 Urea-N, mg/dL 15.55 4.15 1.89 < 0.001 11.12 3.47 1.89 < 0.001
 N, % 0.668 0.606 0.020 0.098 0.629 0.580 0.020 0.189
 Energy, kJ/g 472.0 469.9 26.4 0.940 467.8 436.4 26.4 0.244
 Lactose, % 5.82 5.86 0.12 0.728 5.62 5.66 0.12 0.732
 Fat, % 6.95 7.09 0.67 0.851 7.07 6.41 0.67 0.358
  1. aData are least squares means
  2. bMaximum value of the standard error of the means
  3. cThe main effect of lactation stage (early vs. peak) was significant for milk yield