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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