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1 December 2011 Anesthesia of Tibetan Yak (Bos grunniens) Using Thiafentanil - Xylazine and Carfentanil - Xylazine
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The use of 0.025 ± 0.012 mg/kg (median ± interquartile range) thiafentanil with 0.15 ± 0.03 mg/kg xylazine (TX) and 0.011 ± 0.0015 mg/kg carfentanil with 0.25 ± 0.093 mg/kg xylazine (CX), with dosages based on estimated bodyweight, was used in the anesthesia of 37 Tibetan yak (Bos grunniens) housed within a drive-through animal park setting. The median time to lateral recumbency was 5 and 7 min for each group, respectively. With the addition of propofol in 8 CX animals and 17 TX animals, the anesthetic plane was suitable for a wide range of procedures. The median time to standing recovery following administration of naltrexone was 4 ± 3.5 min with TX and 7 ± 1.5 min with CX. There was one fatality and one case of renarcotization in the TX group. Overall, the dosages used in the study provided a reliable and useful anesthetic induction protocol, with TX animals demonstrating a more rapid induction and recovery with less cardiac depression than CX animals.

American Association of Zoo Veterinarians
Andrew Cushing, Modesto McClean, Michael Stanford, Tessa Lohe, Benjamin E. Alcantar, and Andrea Denise Chirife "Anesthesia of Tibetan Yak (Bos grunniens) Using Thiafentanil - Xylazine and Carfentanil - Xylazine," Journal of Zoo and Wildlife Medicine 42(4), 713-717, (1 December 2011).
Received: 12 August 2010; Published: 1 December 2011

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