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Practice of a of of cattle testifies that has essential impact on survival of not only technology of deep freezing and thawing, but also their quality and a stage of development. For a successful it is necessary to select the without morphological violations which are at stages of a late morula or an early blastotsista.

Need of selection of is dictated also by that circumstance that the wrong development is found in 10% from them, and at a another 25% of cages blastotsist are damaged on average. Such test a big reduction of intact blastomer owing to what the perezhivayemost and further development after freezing and thawing are significantly broken.