Table 5.
Association between different haplotypes (GT, GA, AT, and AA) of GHR and milk yield and quality traits.
| Traits | GT (n = 256) |
GA (n = 48) |
AT (n = 68) |
AA (n = 28) |
|---|---|---|---|---|
| Milk yield (kg, 305 day) | 2090.48 ± 43.82 b | 2340.17 ± 40.80 a | 2315.48 ± 44.19 a | 2438.37 ± 43.05 a |
| Fat percentage | 6.03 ± 0.12 Bb | 6.78 ± 0.10 a | 7.04 ± 0.16 Aa | 7.38 ± 0.15 Aa |
| 305 day-fat yield (kg) | 126.16 ± 1.94 Cc | 158.35 ± 2.20 Bb | 163.20 ± 2.16 Bb | 179.38 ± 2.54 Aa |
| Protein percentage | 4.05 ± 0.08 Bb | 4.51 ± 0.07 a | 4.62 ± 0.09 Aa | 4.98 ± 0.11 Aa |
| 305 day-protein yield (kg) | 84.66 ± 1.04 Bc | 105.75 ± 1.13 Ab | 106.47 ± 1.15 Ab | 114.56 ± 1.37 Aa |
| Lactose percentage | 5.10 ± 0.14 | 5.30 ± 0.16 | 5.24 ± 0.23 | 5.51 ± 0.34 |
| Total solid percentage | 17.24 ± 0.39 | 16.85 ± 0.30 | 17.00 ± 0.34 | 17.37 ± 0.39 |
Data are expressed as least squares means ± SEM. Different lowercase letters indicate significant differences between genotypes (p < 0.05). Different uppercase letters indicate significant differences between genotypes (p < 0.01). All p-values were obtained using Bonferroni’s correction for comparison of all haplotypes against wild haplotype GT.