Table 1. Phenotypic, inbreeding and heterosis statistics for Holstein and Jersey milk, fat, and protein yields, productive life (PL), daughter pregnancy rate (DPR), somatic cell score (SCS), fat percent (fat%) and protein percent (protern%) based on genotyped cows.
Trait | Milk (kg) | Fat (kg) | Protein (kg) | PL (months) | DPR (%) | SCS | fat% | protein% | ||
HO | Phenotype | Na | 30,482 | 30,482 | 30,482 | 14,780 | 23,811 | 30,352 | 30,482 | 30,482 |
Mean | 10,857 | 388 | 337 | 42.1 | 24.4 | 2.77 | −0.001 | 0.061 | ||
SDb | 1,635 | 63 | 46 | 22.3 | 17 | 1.47 | 0.206 | 0.087 | ||
inbreeding | Mean | 5.66 | 5.66 | 5.66 | 5.53 | 5.61 | 5.66 | 5.66 | 5.66 | |
SD | 1.65 | 1.65 | 1.65 | 1.67 | 1.63 | 1.65 | 1.65 | 1.65 | ||
regCoffc | −66.12 | −2.47 | −1.96 | −0.268 | −0.072 | 0.004 | − | − | ||
Heterosis | Mean | 0.0014 | 0.0014 | 0.0014 | 0.0022 | 0.0016 | 0.0014 | 0.0014 | 0.0014 | |
SD | 0.0284 | 0.0284 | 0.0284 | 0.0377 | 0.0308 | 0.0285 | 0.0284 | 0.0284 | ||
regCoff | 172.23 | 22.12 | 11.29 | 0.349 | 1.973 | 0.019 | − | − | ||
JE | Phenotype | N | 8,321 | 8,321 | 8,321 | 5,492 | 7,422 | 8,292 | 8,321 | 8,321 |
Mean | 8,284 | 374 | 302 | 49.4 | 30.9 | 3.08 | 0.015 | 0.06 | ||
SD | 1,434 | 63 | 46 | 22.6 | 16.5 | 1.41 | 0.289 | 0.127 | ||
inbreeding | Mean | 6.63 | 6.63 | 6.63 | 6.66 | 6.66 | 6.64 | 6.63 | 6.63 | |
SD | 2.92 | 2.92 | 2.92 | 2.98 | 2.95 | 2.92 | 2.92 | 2.92 | ||
regCoff | −66.12 | −2.47 | −1.96 | −0.268 | −0.072 | 0.004 | − | − | ||
Heterosis | Mean | 0.0112 | 0.0112 | 0.0112 | 0.0127 | 0.0121 | 0.0109 | 0.0112 | 0.0112 | |
SD | 0.0884 | 0.0884 | 0.0884 | 0.0961 | 0.0929 | 0.0865 | 0.0884 | 0.0884 | ||
regCoff | 172.23 | 22.12 | 11.29 | 0.349 | 1.973 | 0.019 | − | − |
Number of records, bSD = Standard deviation, cregCoff was the regression coefficient for inbreeding or heterosis, which was estimated based on a multiple-trait and multiple-breed linear mixed model.