XY sperm separation and use in artificial insemination and other ARTs.

The research article discusses the impressive advancements in XY sperm separation techniques and their applications in artificial insemination and other Assisted Reproductive Technologies (ARTs) in both animals and humans. The researchers are focusing on improving the sperm sorting methods for better outcomes.

XY Sperm Separation and Artificial Insemination

• The study reveals that the application of XY sperm separation in artificial insemination has resulted in the birth of thousands of calves worldwide. This process is viable in both research facilities and rural AI studs.
• The accuracy of the sex selection through this method stands at about 90%. The majority of the facilities sort X- sperm, which is used for various purposes like superovulation, embryo transfer, and in vitro fertilization (IVF), apart from AI.
• They state that it’s feasible to sort nearly 15 million sperm in an hour which can be used for low dose insemination, typically with 2 million frozen sperm per dose. These sperms maintain a minimum of 35% post-thaw motility.

Pregnancy Rates and Herd Management

• The study suggests that pregnancy rates through this method are approximately 70% to 80% of the normal “high” dose unsexed inseminations.
• However, it also emphasizes the need for good herd management practices to achieve high pregnancy rates with sexed sperm.

Applications in Various Species

• The application of the XY sperm separation technique is not limited to cattle. Offsprings of predetermined sex have been birthed in numerous species including humans, sheep, pigs, horses, rabbits, elks, buffalos, cats, and dolphins.
• Each species presents a unique challenge in terms of sperm handling and insemination procedure. Special approaches have been devised to cope with these challenges.

Approaches for Species with Lower Dose of Sexed Sperm

• In pigs, horses, and sheep, the available dose of sexed sperm is significantly lower than what is used for conventional AI. To overcome this issue, species-specific adjustments have been made.
• In pigs, a flexible catheter has been utilized to deliver a small dose of semen as close to the ovulation site as possible.
• In horses, hysteroscopic insemination at the utero tubal junction has proven to result in successful fertilization.
• In sheep, laparoscopic insemination into the uterus is the common procedure for both sexed and unsexed sperm.

Future Scope

• Researchers express optimism that advances in the efficiency of sorting, along with improvements in sperm handling, will likely result in more acceptable pregnancy rates across these species.