• 1
    Deloitte, I. (2005) The economic impact of the horse industry on the United States national report.
  • 2
    Hong, C.B., Donahue, J.M., Giles, R.C., Petritesmurphy, M.B., Poonacha, K.B., Roberts, A.W., Smith, B.J., Tramontin, R.R., Tuttle, P.A. and Swerczek, T.W. (1993) Equine abortion and stillbirth in central Kentucky during 1988 and 1989 foaling seasons. J. Vet. Diagn. Invest. 5, 560-566.
  • 3
    Giles, R.C., Donahue, J.M., Hong, C.B., Tuttle, P.A., Petritesmurphy, M.B., Poonacha, K.B., Roberts, A.W., Tramontin, R.R., Smith, B. and Swerczek, T.W. (1993) Causes of abortion, stillbirth, and perinatal death in horses - 3,527 cases (1986-1991). J. Am. Vet. Med. Ass. 203, 1170-1175.
  • 4
    Bailey, C.S., Macpherson, M.L., Pozor, M.A., Troedsson, M.H.T., Benson, S., Giguere, S., Sanchez, L.C., LeBlanc, M.M. and Vickroy, T.W. (2010) Treatment efficacy of trimethoprim sulfamethoxazole, pentoxifylline and altrenogest in experimentally induced equine placentitis. Theriogenol. 74, 402-412.
  • 5
    LeBlanc, M., Giguere, S., Brauer, K., Paccamonti, D., Horohov, D., Lester, G., O'Donnell, L., Sheerin, B., Pablo, L. and Rodgerson, D. (2002) Premature delivery in ascending placentitis is associated with increased expression of placental cytokines and allantoic fluid prostaglandins E-2 and F-2 alpha. Theriogenol. 58, 841-844.
  • 6
    Mays, M., LeBlanc, M. and Paccamonti, D. (2002) Route of fetal infection in a model of ascending placentitis. Theriogenol. 58, 791-792.
  • 7
    Rossdale, P.D., Ousey, J.C., Cottrill, C.M., Chavatte, P., Allen, W.R. and McGladdery, A.J. (1991) Effects of placental pathology on maternal plasma progestagen and mammary secretion calcium concentrations and on neonatal adrenocortical function in the horse. J. Reprod. Fertil. 44, 579-590.
  • 8
    Zent, W.W., Williams, N.M. and Donahue, J.M. (1999) Placentitis in Central Kentucky broodmares. Pferdeheilkunde 15, 630-632.
  • 9
    Troedsson, M.H.T. and Zent, W.W. (2004) Clinical ultrasonographic evaluation of the equine placenta as a method to successfully identify and treat mares with placentitis. Proceedings of a Workshop on the Equine Placenta - Kentucky Agricultural Experiment Station. Pp 66-68.
  • 10
    Renaudin, C.D., Troedsson, M.H., Gillis, C.L., King, V.L. and Bodena, A. (1997) Ultrasonographic evaluation of the equine placenta by transrectal and transabdominal approach in the normal pregnant mare. Theriogenol. 47, 559-573.
  • 11
    Troedsson, M.H.T., Renaudin, C.D., Zent, W.W. and Steiner, J.V. (1997) Transrectal ultrasonography of the placenta in normal mares and mares with pending abortion: a field study. Proc. Am. Ass. Equine Practnrs. 43, 256-258.
  • 12
    Bollwein, H., Weber, F., Woschee, I. and Stolla, R. (2004) Transrectal Doppler sonography of uterine and umbilical blood flow during pregnancy in mares. Theriogenol. 61, 499-509.
  • 13
    Bollwein, H., Maierl, J., Mayer, R. and Stolla, R. (1998) Transrectal color Doppler sonography of the A-uterina in cyclic mares. Theriogenol. 49, 1483-1488.
  • 14
    Pozor, M.A. and McDonnell, S.M. (2004) Color Doppler ultrasound evaluation of testicular blood flow in stallions. Theriogenol. 61, 799-810.
  • 15
    Pozor, M.A., Muehlhaus, J., King, A., Macpherson, M.L., Troedsson, M.H.T. and Bailey, C.S. (2011) Effect of pentoxifylline treatment on testicular perfusion and semen quality in Miniature horse stallions. Theriogenol. 76, 1027-1035.
  • 16
    Bailey, C.S., Sper, R.B., Schewmaker, J.L., Buchanan, C.N., Beachler, T.M., Pozor, M.A. and Whitacre, M.D. (2012) Uterine artery blood flow remains unchanged in pregnant mares in response to short-term administration of pentoxifylline. Theriogenol. 77, 430-436.
  • 17
    Cobian-Sanchez, F., Prefumo, F., Bhide, A. and Thilaganathan, B. (2004) Second-trimester uterine artery Doppler and spontaneous preterm delivery. Ultrasound Obstet. Gynecol. 24, 435-439.
  • 18
    Campbell, S., Pearce, J.M., Hackett, G., Cohen-Overbeek, T. and Hernandez, C. (1986) Qualitative assessment of uteroplacental blood flow: early screening test for high-risk pregnancies. Obstet. Gynecol. 68, 649-653.
  • 19
    Salvesen, K.A. (2002) EFSUMB: safety tutorial: epidemiology of diagnostic ultrasound exposure during pregnancy – European committee for medical ultrasound safety (ECMUS). Eur. J. Ultrasound 15, 165-171.
  • 20
    Schulman, H., Winter, D., Farmakides, G., Ducey, J., Guzman, E., Coury, A. and Penny, B. (1989) Pregnancy surveillance with Doppler velocimetry of uterine and umbilical arteries. Am. J. Obstet. Gynecol. 160, 192-196.
  • 21
    Sieroszewski, P., Suzin, J., Bernaschek, G. and Deutinger, J. (2001) Evaluation of first trimester pregnancy in cases of threatened abortion by means of Doppler sonography. Ultraschall in Der Medizin 22, 208-212.
  • 22
    Blaich, U., Petzold, S., Bartmann, C.P., Lorber, K., Schoon, H.A., Raila, G. and Bollwein, H. (1999) Doppler ultrasonographic studies of the uterine blood flow in mares. Pferdeheilkunde 15, 547-550.
  • 23
    Bollwein, H., Mayer, R. and Stolla, R. (2003) Transrectal Doppler sonography of uterine blood flow during early pregnancy in mares. Theriogenol. 60, 597-605.
  • 24
    Bollwein, H., Weber, F., Kolberg, B. and Stolla, R. (2002) Uterine and ovarian blood flow during the estrous cycle in mares. Theriogenol. 57, 2129-2138.
  • 25
    Stolla, R., Chen, Y.H. and Bollwein, H. (2001) Examination of embryonic death in mares using colour Doppler and B-mode sonography. Pferdeheilkunde 17, 543-547.
  • 26
    Murchie, T.A., Macpherson, M.L., LeBlanc, M.M., Luznar, S. and Vickroy, T.W. (2006) Continuous monitoring of penicillin G and gentamicin in allantoic fluid of pregnant pony mares by in vivo microdialysis. Equine Vet. J. 38, 520-525.
  • 27
    Stawicki, R., Ruebel, H., Hansen, P., Sheerin, B., O'Donnell, L., Lester, G., Paccamonti, D. and LeBlanc, M. (2002) Endocrinological findings in an experimental model of ascending placentitis in the mare. Theriogenol. 58, 849-852.
  • 28
    Reef, V.B., Vaala, W.E., Worth, L.T., Sertich, P.L. and Spencer, P.A. (1996) Ultrasonographic assessment of fetal well-being during late gestation: development of an equine biophysical profile. Equine Vet. J. 28, 200-208.
  • 29
    Bollwein, H., Diaz, L. and Sieme, H. (2008) Relationships between age, parity, endometrial fibrosis, early pregnancy rate and uterine blood flow in mares. Tieraerztliche Praxis Ausgabe Grosstiere Nutztiere 36, 204-208.
  • 30
    Tarhan, S., Gumus, B., Gunduz, I., Ayyildiz, V. and Goktan, C. (2003) Effect of varicocele on testicular artery blood flow in men - Color Doppler investigation. Scand. J. Urol. Nephrol. 37, 38-42.
  • 31
    Bollwein, H., Woschee, I. and Stolla, R. (1999) Equine uterine blood flow during pregnancy. Pferdeheilkunde 15, 595-598.
  • 32
    Faul, F., Erdfelder, E., Lang, A. and Buchner, A. (2007) G*Power 3: A flexible statistical power analysis program for the social, behavioral, and biomedical sciences RID A-1770-2009. Behav. Res. Methods. 39, 175-191.
  • 33
    Faul, F., Erdfelder, E., Buchner, A. and Lang, A. (2009) Statistical power analyses using G*Power 3.1: tests for correlation and regression analyses. Behav. Res. Methods. 41, 1149-1160.
  • 34
    Curran, S. and Ginther, O.J. (1995) M-Mode ultrasonic assessment of equine fetal heart-rate. Theriogenol. 44, 609-617.
  • 35
    Reef, V.B., Vaala, W.E., Worth, L.T., Spencer, P.A. and Hammett, B. (1995) Ultrasonographic evaluation of the fetus and intrauterine environment in healthy mares during late-gestation. Vet. Radiol. Ultrasound 36, 533-541.
  • 36
    Zimmermann, P., Eiriö, V., Koskinen, J., Niemi, K., Nyman, R., Kujansuu, E. and Ranta, T. (1997) Effect of low-dose aspirin treatment on vascular resistance in the uterine, uteroplacental, renal and umbilical arteries - a prospective longitudinal study on a high risk population with persistent notch in the uterine arteries. Eur. J. Ultrasound 5, 17-30.
  • 37
    Bollwein, H., Kolberg, B. and Stolla, R. (2004) The effect of exogenous estradiol benzoate and altrenogest on uterine and ovarian blood flow during the estrous cycle in mares. Theriogenol. 61, 1137-1146.