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Table 3 Productive/reproductive parameters and metabolic/endocrine variables (LSM ± SE) for IGF-I genotypes of Holstein cows in two commercial farms.

From: Metabolic and endocrine profiles and reproductive parameters in dairy cows under grazing conditions: effect of polymorphisms in somatotropic axis genes

 

Farm 1

IGF-I genotype

  

Farm 2

IGF-I genotype

 

AA

AB

BB

SM

AA

AB

BB

SM

Milk (L)

18.0

18.2

16.9

0.56

21.4

23.4

22.8

0.96

FCM (L)

15.9

16.2

15.0

0.51

19.7a

22.1b

21.9ab

1.05

Total solids (kg)

1.13

1.16

1.08

0.04

1.46a

1.62b

1.60ab

0.07

Calving 1st service (days)

85ab

73b

103a

10

85

81

77

5

Service/conception

2.2

2.5

2.2

0.3

1.5

1.4

1.5

0.2

   Pregnancy rates

80

82

74

8

68

69

66

10

   NEFA (mmol/L)

0.42a

0.41a

0.37b

0.01

0.32

0.36

0.34

0.03

   BHB (mmol/L)

0.27a

0.27a

0.24b

0.01

0.62

0.66

0.56

0.07

   Insulin (μUI/mL)

2.91a

3.19a

4.18b

0.27

2.60

2.55

2.60

0.42

   IGF-I (ng/mL)

85.8

97.5

94.8

7.45

117.8

112.9

115.9

12.2

   BCS

2.7

2.9

2.7

0.2

3.00

3.02

3.03

0.05

  1. ab Values marked with different letters are significantly different at P < 0.05