Table 3.
Analysis of boTLR1 SNP genotypes by CM and milk productivity traits over the first three lactations.
| SNP | Gen. | n = | P% with CM1 | Mean CM rate2 | P = 3 | Median SCC4 | P = 3 | Mean 305 d milk yield4 | P = 3 | Mean milk fat (%)4 | P = 3 | Mean milk protein (%)4 | P = 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| tag-79 T > G | TT | 78* | 58% | 0.40 (± 0.11) | 1.96 (± 0.63) | 7868 (± 1181) | 4.15 (± 0.41) | 3.28 (± 0.19) | |||||
| TG | 122* | 60% | 0.75 (± 0.18) | < 0.05 | 1.85 (± 0.61) | - | 8058 (± 1139) | - | 4.02 (± 0.38) | < 0.05 | 3.2 (± 0.17) | < 0.01 | |
| GG | 46* | 70% | 0.70 (± 0.24) | - | 1.98 (± 0.67) | - | 7983 (± 1273) | - | 3.89 (± 0.41) | < 0.01 | 3.16 (± 0.18) | < 0.001 | |
| +1762A > G | AA | 33 | 63% | 0.69 (± 0.27) | - | 1.96 (± 0.64) | - | 8101 (± 1106) | - | 3.95 (± 0.41) | - | 3.19 (± 0.18) | - |
| GA | 57 | 61% | 0.66 (± 0.18) | - | 1.89 (± 0.69) | - | 8067 (± 1330) | - | 4.04 (± 0.45) | - | 3.21 (± 0.2) | - | |
| GG | 35 | 59% | 0.38 (± 0.16) | 1.90 (± 0.62) | 8239 (± 1185) | 4.05 (± 0.38) | 3.25 (± 0.16) | ||||||
| +2463 C > T | CC | 64 | 67% | 0.70 (± 0.24) | - | 1.95 (± 0.66) | - | 7841 (± 1067) | - | 4.02 (± 0.45) | - | 3.19 (± 0.18) | < 0.05 |
| CT | 102 | 61% | 0.70 (± 0.14) | < 0.05 | 1.90 (± 0.63) | - | 8137 (± 1206) | - | 3.98 (± 0.45) | - | 3.18 (± 0.2) | < 0.05 | |
| TT | 59 | 59% | 0.39 (± 0.11) | 1.88 (± 0.63) | 7940 (± 1262) | 4.13 (± 0.38) | 3.27 (± 0.18) | ||||||
Abbreviations: Gen. = genotype, P% = population percentage, CM = clinical mastitis, SCC = somatic cell count. * Numbers from tagged SNP +798 C > T in Table 2. 1No significance was detected between genotypes by Chi^2 odds ratio test. 2Mean ± 95% confidence interval given in column parentheses. 3P values analysed by ANOVA and Tukey's multiple comparisons, showing only results tested against the underlined (lower CM rate) genotype; - (dash) denotes no significance. 4Standard deviation from the mean given in column parentheses.