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Table 5 Lactation performance of lactating Holstein dairy cows with different milk yields1

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

Items2 LMY MMY HMY SEM P-value
Milk yield, kg/d 29.6c 38.2b 45.8a 2.08 0.024
Milk fat, % 3.88a 3.70b 3.65b 0.31 0.038
Milk protein, % 3.36a 3.30ab 3.21b 0.27 0.031
Total milk solids, % 13.0a 12.5ab 12.0b 0.99 0.040
FCM yield, kg/d 28.9c 36.4b 43.5a 2.38 0.042
ECM yield, kg/d 29.6c 37.3b 44.2a 2.48 0.039
  1. 1LMY low milk yield (< 34.7, n = 30), MMY medium milk yield (34.7–41.5, n = 49), HMY high milk yield (> 41.5, n = 32), 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)