Animal Reproduction (AR)
https://animal-reproduction.org/article/5b5a603ff7783717068b4658
Animal Reproduction (AR)
Conference Paper

Sex-sorted sperm for artificial insemination and embryo transfer programs in cattle

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The selection of offspring from the desired sex can be one of the determining factors to increase the genetic progress and farmer´s profitability in either beef or dairy cattle. In fact, the use of sex-sorted sperm has been applied worldwide combined with artificial insemination (AI) upon estrus detection in heifers. Additionally, several researches have been performed aiming to investigate the use of sex-sorted sperm during timed AI (TAI) programs and for insemination of superstimulated donors for in vivo embryo programs. Pregnancy per AI (P/AI) of cyclic heifers inseminated in estrus with sex-sorted sperm has been reported to be approximately 75 to 80% of the P/AI of heifers inseminated with non-sorted sperm. Insemination of superstimulated cows with sex-sorted sperm has been reported to reduce the production of viable embryos. Recently, however, it has been demonstrated that P/AI and embryo production per flushing resulting from AI with sex-sorted sperm may be improved when the time of AI is postponed in relation to the time of AI with non-sorted sperm. The P/AI of non stimulated females and fertilization rates and number of embryos recovered from superstimulated females were increased when AI occurred between 16 and 24 h after the onset of estrus (i.e. 6 to 14 h before ovulation). Nonetheless, despite the improvements achieved in the last decade, there is still a significant individual variability in fertility among bulls that have their sperm sex-sorted. It is critical that the pre-determination of the sire fertility is a paramount when sex-sorted sperm is utilized in commercial AI and ET programs. Thus, the aim of this review is to discuss the main concepts related to the use of sex-sorted sperm in TAI and ET programs, addressing some strategies to increase the efficiency of the technique.
bovine, fertility, reproduction, sexed semen, sorting technique
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