VGO-0012
QUESTION
The frozen semen is kept in?
OPTIONS
(A) Liquid nitrogen
(B) Liquid helium
(C) Dry Carbon-dioxide
(D) Ice
ANSWER
(A) Liquid nitrogen
EXPLANATION
Liquid nitrogen maintains frozen semen at approximately -196 degrees Celsius, greatly suppressing biological activity and allowing long-term cryopreservation. Ordinary ice is far too warm, and dry carbon dioxide provides only about -78.5 degrees Celsius, which is unsuitable for routine long-term semen banking. Liquid helium is colder but is unnecessarily expensive and is not the standard storage medium used in artificial insemination programs.
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Veterinary Gynaecology and Obstetrics · 240 Questions
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