Aspects related to the technique and the utilization of sexed semen in vivo and in vitro
Arruda, R PCeleghini, E C CAlonso, M ACarvalho, H FLemes, K MSilva, D FRodriguez, S A FAffonso, F J
The development of methods capable of selecting the sex of animals has always been a great challenge for humankind. Separating X chromosome- bearing and Y chromosome-bearing sperm based on DNA difference using flow cytometry is the only technique that has achieved a useful level of progress, especially in cattle. This allowed the technique to be commercially applicable in this species. Thorough this review, aspects related to the sexing technique (flow cytometry) and to the sperm will be discussed along with the in vitro use of sexed semen. Besides, number of sperm used and semen deposition location, the influence of reproductive status (heifers vs. cows), time of insemination and production of embryos in superovulated donors will be reviewed.(AU)
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