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Table 6 Lactation performance of lactating Holstein dairy cows with different milk fat yields1

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

Items2 LMFY MMFY HMFY SEM P-value
Milk fat yield, g/d 1138c 1435b 1732a 15.38 0.029
Milk yield, kg/d 32.1c 39.1b 44.2a 2.01 0.038
Milk fat, % 3.59c 3.71b 3.94a 0.27 0.041
Milk protein, % 3.18c 3.31b 3.41a 0.32 0.048
Total milk solids, % 12.6 12.3 12.6 0.93 0.863
FCM yield, kg/d 29.9c 37.2b 43.6a 2.79 0.036
ECM yield, kg/d 30.5c 37.8b 44.7a 2.95 0.041
  1. 1LMFY low milk fat yield (< 1278, n = 39), MMFY medium milk fat yield (1278–1550, n = 41), HMFY high milk fat yield (> 1550, n = 31), n number of observations in the data set
  2. 2FCM 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]
  3. a-cMeans in the same row with different superscripts are significantly different (P < 0.05)