Acknowledgement
The Russian Science Foundation, grant number 18-16-00071, has funded this research. We are greatly indebted to the bioresource collection "Cryobank of Genetic Resources", ARRIHB, Ryazan Region, Russia, for the samples of the frozen stallion sperm provided. For sharing the stallion photos, we thank very much Mrs. Olga Makarova (Figure 1A), Mrs. Tatiana Linenko (Figure 1B), Mrs. Svetlana Burmistrova (Figures 1C and 1D), and Mrs. Natalia Frolova (Figure 1E). The skilled technical assistance of Mrs. Olga M. Romanova in preparing figures is kindly appreciated.
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