Accuracy of pregnancy diagnosis in swine by ultrasonography.

Early and accurate diagnosis of nonpregnant sows and gilts has the potential to increase reproductive efficiency and the financial income in pig production by reducing non-productive days per sow per year. The objectives of this study were to compare the efficiency of pregnancy diagnosis between Doppler Echo+ and real time ultrasonography (RTU) and to compare the efficiency by using RTU at different days post-mating (days 17 to 24) under commercial conditions. In the 1st study, using crossbreed sows and gilts (n=107), pregnancy diagnoses were done with Doppler Echo+ and then with RTU. Between 28 and 65 days of gestation, Doppler Echo+ had 85% sensitivity and 32% specificity, and efficiency was 73%. In the 2nd study, sows (n=142) were scanned for pregnancy diagnosis between 17 and 24 d post-mating (PD1) and reconfirmed between 38 and 45 days of gestation (PD2). After 21 days of gestation, RTU had over 90% sensitivity and 45% specificity, and 70% efficiency. Accuracy between PD1-farrowing was 75.5% and between PD1 and PD2 was 80.6%. In the 3rd study, sows were diagnosed pregnant by RTU (n=151) at 17 to 24 days of gestation or A-mode ultrasound (n=172) at 28 to 30 days of gestation. There were no significant differences in conception rate (P > 0.09) and farrowing rate (P > 0.67) between both groups. Hence, there was no improvement in fertility and farrowing rate by using RTU instead of A-mode ultrasound under commercial conditions.

[1]  S. Chadio,et al.  Early pregnancy diagnosis in swine by direct radioimmunoassay for progesterone in blood spotted on filter paper. , 2002, Animal reproduction science.

[2]  F. De Rensis,et al.  Early diagnosis of pregnancy in sows by ultrasound evaluation of embryo development and uterine echotexture , 2000, Veterinary Record.

[3]  Robert Victor Knox,et al.  Visualizing the reproductive tract of the female pig usingreal-time ultrasonography , 1999 .

[4]  T. Nakao,et al.  Early Pregnancy Diagnosis in the Sow by Fecal Gestagen Measurement Using a Bovine Milk Progesterone Qualitative Test EIA Kit , 1997 .

[5]  J. Kauffold,et al.  [Results and experiences of a two-year investigation in the use of sonographic pregnancy control in sows at different stages of gestation]. , 1997, Tierarztliche Praxis. Ausgabe G, Grosstiere/Nutztiere.

[6]  E. Cornwell,et al.  Use of an on-farm progesterone assay kit to determine pregnancy in sows , 1989, Veterinary Record.

[7]  J. A. Foulkes,et al.  Occurrence of two phases of return to oestrus in sows on commercial units , 1988, Veterinary Record.

[8]  Almond Gw,et al.  Pregnancy diagnosis in swine: a comparison of the accuracies of mechanical and endocrine tests with return to estrus. , 1986 .

[9]  F. Martinat-Botté,et al.  Use of ultrasound scanning in swine for detection of pregnancy and some pathological conditions. , 1986, Theriogenology.

[10]  M. Taverne,et al.  Pregnancy diagnosis in pigs: a field study comparing linear-array real-time ultrasound scanning and amplitude depth analysis. , 1985, The Veterinary quarterly.

[11]  T. Inaba,et al.  Early pregnancy diagnosis in sows by ultrasonic linear electronic scanning. , 1983, Theriogenology.

[12]  G. Weiss.  [Possibilities and limits of pregnancy diagnosis in domestic animals using the ultrasonic Doppler technic]. , 1975, Schweizer Archiv fur Tierheilkunde.

[13]  S. White,et al.  Real-time ultrasonography and pregnancy diagnosis in swine , 2000 .

[14]  M. Taverne,et al.  Pregnancy diagnosis in sows: direct ELISA for estrone in feces and its prospects for an on-farm test, in comparison to ultrasonography. , 1999, Theriogenology.

[15]  B. Chomel,et al.  [Veterinary epidemiology]. , 1991, Revue d'epidemiologie et de sante publique.

[16]  G. Dial,et al.  Pregnancy diagnosis in swine: a comparison of the accuracies of mechanical and endocrine tests with return to estrus. , 1986, Journal of the American Veterinary Medical Association.