Table 1.
Distribution of number and proportions of inseminations, days from calving to first observed ovulatory oestrus, oestrus intensity (2 = weak and 4 = strong), number and proportions of detected oestruses and number and proportions of false inseminations per ovulation number for Swedish dairy cows
| Ovulation number | |||||
|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | ≥ 5 | |
| Inseminations, n (%) | 70 (3.3) | 370 (17.4) | 524 (24.6) | 439 (20.6) | 727 (34.1) |
| Day of first observed ovulatory oestrus, mean (SD) | 46 (29) | 67 (33) | 92 (34) | 117 (34) | 166 (45) |
| Oestrus intensity, mean (SD) | 2.21 (1.34) | 2.91 (0.73) | 2.93 (0.67) | 2.94 (0.68) | 2.97 (0.68) |
| Detected oestruses, n (%)a | 657 (75) | 614 (77) | 686 (83) | 541 (87) | 911 (89) |
| False inseminations, n (%)b | 9 (11.4) | 17 (4.4) | 21 (3.9) | 12 (2.7) | 25 (3.3) |
aNumber and proportion of visible oestrous observations out of oestruses based on low P4 concentration
bInseminations performed with high P4 concentration (numbers and proportions out of total number of inseminations)