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Table 7 Lactation performance of lactating Holstein dairy cows with different milk protein yields1

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

Items2 LMPY MMPY HMPY SEM P-value
Milk protein yield, g/d 983c 1254b 1490a 16.7 0.024
Milk yield, kg/d 31.6c 38.1b 44.2a 2.39 0.041
Milk fat, % 3.65c 3.71b 3.83a 0.31 0.039
Milk protein, % 3.16b 3.31ab 3.39a 0.28 0.031
Total milk solids, % 11.8 12.5 12.3 0.79 0.762
FCM yield, kg/d 29.7c 36.3b 42.9a 2.98 0.039
ECM yield, kg/d 30.1c 37.1b 43.9a 3.65 0.025
  1. 1LMPY low milk protein yield (< 1130, n = 35), MMPY medium milk protein yield (1130–1364, n = 39), HMPY high milk protein yield (> 1364, n = 37), 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)