Skip to main content

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