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Table 2: Formulas to prediction the number of days of gestation (GL) or the date of parturition (DP) in days currently available in the literature.
The uterine involution can be observed during 28 days after the parturition. It consists in a slow decrease of the uterine dimeter and the endometrium and myometrium to come back to normal anoestrus especially at the level of the insertion of the placenta. If  uid is observed 1 week after the parturition in the lumen of the uterus, a metritis should be suspected.
1. Abnormal pregnancy
Ultrasound is also a very useful tool to detect embryonic resorption or foetal abortion. There are several causes to the abortion as infection (mostly viral), traumatic, neoplastic, toxic, congenital abnormality of the foetus... The con rmation is not easy to do. During both resorption and abortion, ultrasound can show loss of movement of the embryo/foetus, absence of heart
beat, hyperechoic foci in the gestational chamber and thickening of the uterus wall. Recently, the ultrasound appearance of the drug induced resorption and abortion using Aglepriston was described. The ultrasound  ndings are similar to the one described in pathologic conditions.
Agudelo CF. Cystic endometrial hyperplasia-pyometra complex in cats: A review. Vet Q 2005; 27:173-182.
Gatel L, Rault D, Chalvet-Monfray K, Saunders J, Buff S. Prediction of parturition time in queens using radiography and ultrasonography. Anat Histol Embryol 2015;44:241-246.
Gatel L, Gory G, Chalvet-Monfray K, Saunders D, Rault DN. Intra- and inter- observer variability of ultrasonographic measurements of the uterus and ovaries in healthy non-pregnant queens. J Fel Med Surg 2016;18:110-117.
Keiser R, Reichler IM, Balogh O. Are foetal ultrasonographic and maternal blood progesterone measurements near parturition reliable predictors of the me of birth in the domestic cat? Reprod Dom Anim 2017;52:487-494.
Lopate C. Estimation of gestational age and assessment of canine fetal maturation using radiology and ultrasonography: a review. Theriogenology 2008;70:397-402.
Malandain E, Rault D, Froment E, Baudon S, Desquilbet L, Begon D, Chastant- Maillard S. Follicular growth monitoring in the female cat during estrus. Theriogenology 2011;76:1337-1346.
Rault DN, Gatel L. Appareil génital femelle: Affections de l’appareil génital femelle et gestation, In: Kolb H, Testault I, Echographie abdominale du chien et du chat, 1ère éd. Puteaux: Les éditions du Point Vétérinaire, 2017, p. 300-317.
Schlafer DH. Canine and feline abortion diagnostics. Theriogenology 2008;70:327-331.
An Urban Experience
Measured structured
Usable formulas
External diameter of the gestational chamber (GC in cm)
GL = 1,602 GC – 12,13
Internal diameter of the gestational chamber (GC in cm)
GL = 1,368 GC – 11,566
Crown rump length of the embryo (CR in cm)
CR = 0,01 GL2 – 0,28 GL + 2,69 (between 19 and 40 days after mating)
Crown rump length of the embryo (CR in cm)
GL = 2,0087 CR – 31,43
Body diameter (BD in cm)
DP = 43,5 – 10,9 BD
Biparietal diameter (BPD in cm)
BPD = 0,05 GL – 0,64 (33 days after mating)
Biparietal diameter (BPD in cm)
DP = 61,2 – 24,6 BPD
Biparietal diameter (BPD in cm)
GL = 61,2 – 24,6 BPD
Biparietal diameter (BPD in cm)
BPD = 23,39 + 0,47 GL
Femur length (FL in cm)
FL = 0,050 DG – 0,79 (40 days after mating)
Femur length (FL in cm) (W=weight in kg, LS=litter size, A=age in years)
DP = 37,864 – 19,3 FL+ 1,227 W – 0,615 LS – 0,832 A

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