Table 2 Least square means (± pooled standard error) of SNP IGF-1 / Sna BI-associated effects on productive and reproductive traits in Holstein-Friesian cows
| Â | SNP IGF-1/Sna BI genotype | Additive effect | P-value | Dominance effect | P- value | Allele substitution effect | P- value | ||
|---|---|---|---|---|---|---|---|---|---|
| Â | AA | AB | BB | Â | Â | Â | Â | Â | Â |
Production 1 (n = 70) |  |  |  |  |  |  |  |  |  |
Milk Yield (L/cow) | 25.4 ± 0.7 | 26.3 ± 0.5 | 25.7 ± 1.1 | − | − | − | − | − | − |
4% Fat-Corrected Milk (L/cow) | 22.8 ± 0.7 | 23.4 ± 0.5 | 23.8 ± 0.9 | − | − | − | − | − | − |
Total Solids Yield (kg/cow) | 2.9 ± 0.1 | 2.9 ± 0.06 | 2.9 ± 0.1 | − | − | − | − | − | − |
Fertility (days) | Â | Â | Â | Â | Â | Â | Â | Â | Â |
Calving-CLA (n = 70) | 35.0 ± 6.0ax | 49.8 ± 4.5bx | 67.8 ± 8.6by | −32.8 ± 10.5 | 0.003 | −1.6 ± 9.8 | 0.07 | −16.0 ± 5.0 | 0.002 |
Calving-First Service (n = 55) | 83.2 ± 4.5 | 81.6 ± 3.3 | 79.0 ±6.7 | − | − | − | − | − | − |
Calving-Conception (n = 42) | 90.8 ± 5.5 | 86.7 ± 3.7 | 92.0 ± 7.0 | − | − | − | − | − | − |