Characterizing estrus by trans-abdominal ultrasounds, fecal estrone-3-glucuronide, and vaginal cytology in the Steller sea lion (Eumetopias jubatus)
Keywords: هورمون های مدفوع; Endocrinology; Fecal hormones; Estrus cycle; Non-invasive sampling methods; Captive breeding; Reproduction; Estrogen;