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KMID : 1094020080250060501
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Journal of Veterinary Clinics
2008 Volume.25 No. 6 p.501 ~ p.505
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Estimation of Gestational Age by Measurement of Fetal and Extra-fetal Structures in Miniature Schnauzer Bitches
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Kim Bang-Sil
Son Chang-Ho
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Abstract
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Serial ultrasonographic examinations were performed on 9 Miniature Schnauzer bitches from day 15 of gestation until parturition to determine the ultrasonographic measurement of gestational structures. Ovulation was designated the day that plasma progesterone concentration exceeded 4.0 ng/ml (day 0). Extra-fetal structures were measured from day 17 or 18 to 60. Outer uterine diameter (OUD) increased from 6.50 ± 1.06 mm (Mean ± SD) to 50.89 ± 5.62 mm, inner chorionic cavity diameter (ICCD) increased from 2.10 ± 0.15 mm to 37.15 ± 4.36 mm, and length of placenta (PL) increased from 7.50 ± 1.41 mm to 40.62 ± 3.27 mm. OUD and ICCD were significantly and linearly relative to gestational age especially through day 37, whereas PL was not significantly relative to gestational age. Of the extra-fetal structures, ICCD was the most accurate for estimation of gestational age before day 38 of gestation. Fetal structures increased at a linear rate to parturition. Fetal crown-rump length (CRL) increased from 2.55 ± 0.07 mm on day 22 to 85.25 ± 9.89 mm on day 48. Fetal head diameter (HD) increased from 3.43 ± 0.64 mm on day 27 to 25.06 ± 0.41 mm on day 63. Fetal body diameter (BD) increased from 5.96 ± 0.84 mm on day 30 to 43.76 ± 3.36 mm on day 63. Of the fetal structures, HD was the most accurate for estimation of gestational age after day 38 to parturition.
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KEYWORD
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gestational age , Miniature Schnauzer bitches , gestational structures , ultrasonographic measurement
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