Table 4.
Effects of different non-genetical factors on milking traits and somatic cell score (SCS) of Holstein cows.
| Factors | Milking Traits and SCS | F Value | Sig |
|---|---|---|---|
| Test year | TDMY | 9.63 ** | 0.00 |
| FC | 4.39 * | 0.01 | |
| PC | 9.02 ** | 0.00 | |
| SCS | 9.67 ** | 0.00 | |
| Test season | TDMY | 69.27 ** | 0.00 |
| FC | 99.59 ** | 0.00 | |
| PC | 159.50 ** | 0.00 | |
| SCS | 7.26 ** | 0.00 | |
| Parity | TDMY | 188.99 ** | 0.00 |
| FC | 0.52 | 0.60 | |
| PC | 10.80 ** | 0.00 | |
| SCS | 83.49 ** | 0.00 | |
| Calving season | TDMY | 23.83 ** | 0.00 |
| FC | 5.50 ** | 0.00 | |
| PC | 6.94 ** | 0.00 | |
| SCS | 8.40 ** | 0.00 | |
| Days in milk | TDMY | 471.99 ** | 0.00 |
| FC | 97.49 ** | 0.00 | |
| PC | 745.58 ** | 0.00 | |
| SCS | 35.48 ** | 0.00 | |
| Farm | TDMY | 49.75 ** | 0.00 |
| FC | 65.90 ** | 0.00 | |
| PC | 187.06 ** | 0.00 | |
| SCS | 85.29 ** | 0.00 |
Analysis of variance adopts the method of the joint hypotheses test (F test). The F value in the result represents a specific value obtained by using the formula of the F test. According to this value, the corresponding p value can be obtained by looking up tables or other methods, that is significance (Sig). TDMY is test-day milk yield; FC is fat content; PC is protein content; SCS is somatic cell score; *: p < 0.05; **: p < 0.01.