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Table 3 Carbon dioxide emissions of lactating Holstein dairy cows with different paritiesa

From: Characterization and mitigation option of greenhouse gas emissions from lactating Holstein dairy cows in East China

Itemsb SP TP FAP SEM P-value
Animal description
 Metabolic weight, kg 133.5 140.5 138.3 2.31 0.633
Milk production and composition
 Milk yield, kg/d 38.5 37.5 37.7 4.43 0.379
 Milk fat, % 3.71 3.70 3.83 0.27 0.737
 Milk protein, % 3.26 3.27 3.37 0.35 0.645
 Total milk solids, % 12.4 12.6 12.4 2.74 0.794
 FCM yield, kg/d 36.8 35.8 36.5 4.33 0.594
 ECM yield, kg/d 37.6 36.5 37.1 5.29 0.633
Carbon dioxide emissions
 Total CO2, g/d 19,236 19,184 19,146 19.03 0.291
 Total CO2/MW, g/kg 144.5 137.2 139.0 4.78 0.516
 Total CO2/ECM, g/kg 518.8 535.1 524.4 7.53 0.668
  1. aSP second parity (n = 56), TP third parity (n = 30), FAP fourth and above parity (n = 25); n, number of observations in the data set
  2. bFCM Fat-corrected milk (kg/d) = 0.4 × milk yield (kg/d) + 15 × fat yield (kg/d). ECM Energy-corrected milk (kg/d) = milk yield (kg/d) × [(38.3 × fat (%) × 10 + 24.2 × protein (%) × 10 + 16.54 × lactose (%) × 10 + 20.7) ÷ 3140]. Total CO2, total CO2 production (g/d) = \( {\mathrm{CH}}_{4\left({\mathrm{CO}}_2-\mathrm{eq}\right)} \) (g/d) + CO2 production (g/d). MW metabolic weight (kg)