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A 9-year-old 59.0-kg (129.8-lb) sexually intact male alpaca was examined because of enlargement of the right testicle. The owners noticed the enlarged testicle when they recently had the alpaca sheared; however, the exact duration of enlargement was unknown. The alpaca had not been used for breeding and did not have any previous health problems. The owners had not noticed any changes in behavior.

On physical examination, the alpaca had a rectal temperature of 38.1°C (100.6°F; reference range, 37.5°C to 38.9°C [99.5°F to 102°F]), heart rate of 70 beats/min (reference range, 60 to 90 beats/min), and respiratory rate of 20

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in Journal of the American Veterinary Medical Association
History

A 10-year-old 57-kg sexually intact female alpaca was presented because of a 3- to 4-month history of aggressive behavior (attacking and charging herdmates). The alpaca previously had several successful pregnancies, with her last cria born approximately 1.5 years earlier. There had been no other male exposure since that breeding, as the owners only have females and 1 gelding (housed separately). The referring veterinarian collected blood for hormone testing through the Cornell University Animal Health Diagnostic Center in Ithaca, NY. Serum progesterone concentration was 10.49 ng/mL, consistent with progesterone concentration reference limit of > 2 mg/mL during pregnancy in camelids.

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in Journal of the American Veterinary Medical Association