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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)