THE EFFECT OF PUNCTURING THE ZONA PELLUCIDA ON FREEZE-THAW SURVIVAL OF BOVINE EMBRYOS
1979 ◽
Vol 59
(3)
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pp. 623-626
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The zona pellucida of fertilized bovine embryos of the morula stage (day 6) were punctured using a micromanipulator and a glass knife. In the presence of 2 M DMSO, 23 embryos were cooled (0.5 °C/min) to −196 °C and, upon thawing (10 °C/min), transferred into nine recipients. Although the embryos, before and after the freeze-thaw cycle, were morphologically indistinguishable, only one calf was born. The role of the zona pellucida during freezing and thawing is discussed.
2015 ◽
Vol XL-1-W5
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pp. 365-368
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2002 ◽
Vol 357
(1423)
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pp. 909-916
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Keyword(s):
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2013 ◽
Vol 716
◽
pp. 688-692
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2011 ◽
Vol 91
(2)
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pp. 223-233
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