Research Article
Estimation of Genetic and Phenotypic Parameters for Production Traits and Somatic Cell Count for Jersey Dairy Cattle in Zimbabwe
Table 4
Variance components and genetic parameters (±s.e) for production and Log10SCC traits by parity.
| Parity | Trait | | | | | | |
|
All
| Milk (kg) | 86263 | 25532 | 173158 | | | 0.39 | Fat (kg) | 428 | 78 | 822 | | | 0.38 | Protein (kg) | 201 | 36 | 371 | | | 0.39 | Fat% | 0.0587 | 0.0095 | 0.0710 | | | 0.49 | Protein% | 0.0105 | 0.0016 | 0.0117 | | | 0.51 |
Log10SCC
| 0.0252 | 0.0224 | 0.2500 | | | 0.16 |
|
1
| Milk (kg) | 106632 | — | 172145 | | — | — | Fat (kg) | 482 | — | 750 | | — | — | Protein (kg) | 247 | — | 386 | | — | — | Fat% | 0.0364 | — | 0.0405 | | — | — | Protein% | 0.0122 | — | 0.0126 | | — | — |
Log10SCC
| 0.0357 | — | 0.2844 | | — | — |
|
2
| Milk (kg) | 73587 | — | 205573 | | — | — | Fat (kg) | 533 | — | 1122 | | — | — | Protein (kg) | 207 | — | 399 | | — | — | Fat% | 0.0614 | — | 0.0910 | | — | — | Protein% | 0.0087 | — | 0.0122 | | — | — |
Log10SCC
| 0.0473 | — | 0.3039 | | — | — |
|
3+
| Milk (kg) | 61399 | 18852 | 206258 | | | 0.28 | Fat (kg) | 245 | 77 | 779 | | | 0.29 | Protein (kg) | 139 | 53 | 409 | | | 0.32 | Fat% | 0.0282 | 0.0081 | 0.0515 | | | 0.41 | Protein% | 0.0081 | 0.0023 | 0.0136 | | | 0.43 |
Log10SCC
| 0.0420 | 0.0350 | 0.1952 | | | 0.28 |
|
|
: additive genetic variance, : permanent environmental variance, : residual variance, : heritability, : permanent environment, : repeatability, and SCC: somatic cell count.
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