Update on sexed semen technology in cattle

Area of Science:

• Animal Science
• Reproductive Biology
• Biotechnology

Background:

• Current sperm sexing technology utilizes advanced flow cytometry and cell sorting.
• These systems can process over 30,000 sperm evaluations per second per nozzle.
• Sperm are sorted into X-sperm, Y-sperm, and unsexable/dead sperm categories.

Purpose of the Study:

• To evaluate the efficiency and economic feasibility of current sperm sexing technologies.
• To assess the impact of sperm sexing on fertility rates in cattle.
• To identify current and emerging applications of sexed semen in the cattle industry.

Main Methods:

• High-throughput flow cytometry and cell sorting for sperm evaluation and separation.
• Insemination trials comparing sexed semen (2 million sperm/dose) with conventional semen.
• Analysis of pregnancy rates and fertility data in cattle populations.

Main Results:

• Sexed semen at 2 million sperm per inseminate achieves approximately 80% of pregnancy rates compared to conventional semen.
• Sperm sorting can cause damage, leading to slightly lowered fertility.
• Proprietary improvements since 2013 claim a 4-6 percentage point fertility increase.

Conclusions:

• Sperm sexing technology is highly engineered but faces economic limitations due to processing speed and fertility reduction.
• Primary applications include producing heifer calves for dairy herd expansion and purebred breeding.
• Emerging uses involve beef female replacements and in vitro fertilization, with ongoing improvements enhancing viability and application.