Pregnancy-related
event |
Number of days
after ovulation |
Number of days
after fertile mating |
| Onset of oestrus |
-6 to +3 |
|
| First of multiple matings |
-7 to +5 |
-12 to 0 |
| Fertile mating |
-5 to +5 |
0 |
| Ovulation |
0 |
-5 to +5 |
| Fertilization |
2 to 5 |
0 to 7 |
| Vaginal cornification reduced |
5 to 7 |
0 to 12 |
| Embryo attachment to uterus |
14 to 16 |
9 to 21 |
| Vesicles visible with ultrasound |
15 to 17 |
10 to 22 |
| Palpable 1 cm swellings |
20 to 22 |
15 to 27 |
| Foetal heartbeat visible (ultrasound) |
22 to 23 |
17 to 28 |
| Uterine swelling visible on X-ray |
28 to 30 |
23 to 35 |
| Palpability of swellings reduced |
30 to 32 |
25 to 37 |
| Earliest X-ray pregnancy diagnosis |
43 to 45 |
39 to 50 |
| Foetal pelvis visible on X-ray |
51 to 55 |
46 to 60 |
| Foetal teeth visible on X-ray |
56 to 61 |
51 to 66 |
| Whelping |
62 to 64 |
57 to 69 |
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