# Table 7 The relative values between dietary gross energy (GE), digestible energy (DE), metabolizable energy (ME), and net energy (NE) of sows fed Control (CON; 187.4 g/kg crude protein), Optimal (OPT; 137.8 g/kg crude protein) or Optimal + Leucine (OPTLEU; 142.5 g/kg) diets between day 4 and 8 of lactation (early lactation) and between day 14 and 18 of lactation (peak lactation)1

ItemDietSEM2P-value
CONOPTOPTLEUOPT vs. CONOPT LEU vs. CONOPTLEU vs. OPT
Early lactation (day 4 to 8)
Number of sows121111
DE/GE, %
Analyzed88.387.285.20.40.162< 0.010.007
Calculated87.383.683.7
ME/DE, %
Analyzed97.798.598.20.40.3240.6560.836
Calculated96.097.097.0
NElactation/ME, %3
Analyzed51.449.758.94.80.9670.5070.380
Calculated74.875.875.7
NEmilk/ME, %457.564.465.04.30.5000.4480.996
Peak lactation (day 14 to 18)
Number of sows111111
DE/GE, %
Analyzed88.387.285.20.40.162< 0.010.007
Calculated87.383.683.7
ME/DE, %
Analyzed97.598.798.00.40.0630.6350.327
Calculated96.097.097.0
NElactation/ME, %3
Analyzed48.063.0*56.24.80.0920.4680.584
Calculated74.875.875.7
NEmilk/ME, %451.972.463.54.40.0080.1670.339
1. 1Data are least squares means
2. 2Maximum value of the standard error of the means
3. 3$${\mathrm{NE}}_{\mathrm{lactation}}\left(\mathrm{MJ}/\mathrm{kg}\ \mathrm{feed}\ \right)=\frac{\mathrm{Milk}\ \mathrm{energy}\ \mathrm{output}\left(\mathrm{MJ}/\mathrm{d}\right)-\mathrm{Milk}\ \mathrm{energy}\ \mathrm{from}\ \mathrm{body}\ \left(\mathrm{MJ}/\mathrm{d}\right)}{\mathrm{Daily}\ \mathrm{feed}\ \mathrm{intake}\left(\mathrm{kg}/\mathrm{d}\right)}$$
4. 4$${\mathrm{NE}}_{\mathrm{milk}}\left(\mathrm{MJ}/\mathrm{kg}\ \mathrm{feed}\ \right)=\frac{\mathrm{Milk}\ \mathrm{energy}\ \mathrm{output}\left(\mathrm{MJ}/\mathrm{d}\right)}{\mathrm{Daily}\ \mathrm{feed}\ \mathrm{intake}\left(\mathrm{kg}/\mathrm{d}\right)}$$
5. *Main effect of period (early and late) was significant (P < 0.05).