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Endocrine and ultrasonographic aspects of the oestrous cycle of the mule
  1. P. Volpe, DVM, PhD1,
  2. M. Russo, DVM, PhD, MRCVS1,
  3. L. Ianetti, DVM1 and
  4. B. Izzo, DVM, MRCVS2
  1. 1Department of Clinical Sciences, Section of Clinical Obstetrics, Faculty of Veterinary Medicine, University of Naples ‘Federico II’, via F. Delpino 1, 80137 Naples, Italy
  2. 2Equi Sannio Vet, via Coluonni 1, Benevento, Italy


The blood serum concentrations of progesterone and estradiol-17β were measured at various stages of the oestrous cycle of seven female mules, and their reproductive tracts were examined ultrasonographically at the same stages.

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