Table 2.
Productive/reproductive parameters and metabolic/endocrine variables (LSM ± SE) for GH genotypes of Holstein cows in two commercial farms.
| 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 |
ab Values marked with different letters are significantly different at P < 0.05
xy Values marked with different letters are a trend at P < 0.10