Table 3.
Formulas for the estimation of gestational age (GA) in days from fetal measurements in camelids
| Species | Formula | Correlation r | Reference |
|---|---|---|---|
| Camelus dromedarius | GA = (CRV + 23.99)/0.336 | 0.90 | [98], [151] |
| GA = (TCL + 36.80)/0.501 | 0.90 | [98], [151] | |
| Llama glama | GA = 44.77BPD − 51.713 | 0.88 | [100] |
| GA = 67.462 + 11.163W + 0.297BPD | 0.88 | ||
| GA = 16.66W + 169.448 | 0.99 | ||
| GA = 9.94F + 102.029 | 0.91 | ||
| GA = 8.23T + 91.276 | 0.86 | ||
| GA = (BPD − 0.002399)43.02293 | 0.98 | [101] | |
| GA = (TH − 0.07137)46.94485 | 0.95 | ||
| Vicugna alpaca | GA = (BPD − 0.11376)47.23287 | 0.98 | [101] |
| GA = (TH − 0.36436)52.87663 | 0.96 | ||
| GA = 76.6 + 5.1W − 0.06W2 | 0.98 | [102] | |
| GA = 1.3 + 0.09 TL + 0.002TL2 | 0.97 | ||
| GA = 2.8 − 0.08CR + 0.002CR2 | 0.96 | ||
| GA = 3.9 + 0.1 CCR + 0.002CCR2 | 0.98 | ||
W = body weight (kg); CVR = Crown-vertebral rump length; TCL = total conceptus length; BPD = biparietal diameter; TH = thoracic height; F = femur length; T = tibia length; TL = total length of the fetus; CR = crown-rump length; CCR = Curved crown-rump length (all measurements are in cm).