Table 1 Milk yield, compositions and rumen fermentation parameters in cows with different udder health status

 Milk yield, kg/d

42.6^a

32.7^b

28.5^b

1.43

< 0.010

 Milk fat, %

3.58^a

2.80^b

2.14^c

0.14

< 0.010

 Milk protein, %

3.10^b

3.06^b

3.42^a

0.10

< 0.010

 Lactose, %

4.92^a

3.95^b

2.57^c

0.18

< 0.010

 Milk SCC, ×10³ cells/mL

42.8^c

1002^b

7053^a

409

< 0.010

 pH

6.68

6.71

6.73

0.03

0.214

 NH₃-N, mg/dL

10.5

8.64

8.40

0.40

0.061

 RUN, mg/dL

5.90

5.73

6.02

0.20

0.851

 LA, mmol/L

0.86^b

0.90^a

0.80^c

0.01

< 0.010

 Acetate, mmol/L

64.5^a

60.1^a

41.0^b

1.67

< 0.010

 Propionate, mmol/L

27.7^a

25.2^a

19.2^b

0.87

< 0.010

 A/P

2.63

2.35

2.45

0.06

0.111

 Isobutyrate, mmol/L

0.91

0.85

0.83

0.02

0.325

 Butyrate, mmol/L

12.1^a

12.1^a

8.36^b

0.36

< 0.001

 Isovalerate, mmol/L

1.58

1.46

1.38

0.05

0.213

 Valerate, mmol/L

1.54^a

1.55^a

1.15^b

0.05

< 0.010

 TVFAs, mmol/L

109^a

105^a

76.2^b

3.00

< 0.010