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Table 2 Productive/reproductive parameters and metabolic/endocrine variables (LSM ± SE) for GH 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

Farm 2

 

GH genotype

GH genotype

 

LL

LV

SE

LL

LV

SE

Milk (L)

17.9

17.5

0.50

23.1

22.1

0.80

FCM (L)

15.9

15.5

0.45

21.6

21.0

0.91

Total solids (kg)

1.14

1.11

0.03

1.60

1.54

0.06

Calving 1st service (days)

88

86

9

79

83

4

Service/conception

2.3

2.2

0.2

1.3

1.6

0.1

   Pregnancy rates

80

78

7

72

64

10

   NEFA (mmol/L)

0.39a

0.41b

0.02

0.34

0.33

0.03

   BHB (mmol/L)

0.25

0.26

0.01

0.63

0.60

0.06

   Insulin (μUI/mL)

3.5

3.5

0.23

2.60

2.81

0.38

   IGF-I (ng/mL)

98.5x

79.4y

7.45

113.64

113.92

11.14

   BCS

2.9

2.7

0.2

3.04

3.00

0.04

  1. ab Values marked with different letters are significantly different at P < 0.05
  2. xy Values marked with different letters are a trend at P < 0.10
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Acta Veterinaria Scandinavica

ISSN: 1751-0147