JSR Sire Lines

The world renowned JSR Sire Lines

Geneconverter 400

Geneconverter 400

When it comes to sire lines, the GC400 is valued for its notable third breed heterosis, which results in the production of litters of large piglets. Sourced from stock raised without the use of AGPs since 1986, JSR GC400s produce progeny with excellent appetites and constitutions, which grow quickly and efficiently, thriving in a wide range of conditions.



Geneconverter 500

Geneconverter 500

The JSR GC500’s genes mark the culmination of years of careful selection from sire lines, to combine high meat-eating quality without high production costs. Its notable hybrid vigour offers a robust breeding performance in a wide range of conditions and produces offspring of consistently superior conformation. GC500 progeny offer optimum backfat and high intramuscular fat, for succulent and tastier pork.



Geneconverter 600

Geneconverter 600

With its superior White Pietrain genetics, the GC600 offers exceptional hybrid vigour in all crosses. As a result, the GC600’s large piglets are notably healthier and show a great improvement in pre and post-weaning mortality. This advance in health and vitality results in faster, more efficient growth, leading to an improvement in fat grading..



Geneconverter 700

Geneconverter 700

The GC700, developed from a combination of JSR’s efficient White sire lines, is robustly healthy with strong legs and an extremely high libido. Bred specifically for feed efficiency, it boasts an FCR 13.4% lower than the UK average. The GC700 carcass also shows significant increases in muscularity, especially in the loin, detected through JSR’s pioneering use of CT scanning.



Geneconverter 750

Geneconverter 750

The Geneconverter 750 is the newest addition to the JSR portfolio. It has been developed from the very best of JSR’s White sire lines to produce a robust breed. The GC750 has outstanding semen quality, backed with consistent performance.



Geneconverter 800m

Geneconverter 800m

The fast-growing Geneconverter 800m has been developed from JSR's global pool of quality genetics. Using advanced technology at our flagship Nucleus Unit in Oxfordshire, we have been able to test feed efficiency and growth rates to produce one of the leading, record-breaking sire lines.

CT scanning technology has enabled us to ensure good carcass yields along with ultrasound scanning for intramuscular fat content. As sire lines go, this is the most exciting boar JSR has developed for many years.



Geneconverter 900

Geneconverter 900

The Geneconverter 900 delivers the most impressive results ever seen against our competitors at JSR, being up to three weeks quicker to slaughter (105kg) than competitor sire lines on the same farm. With genomic developments and selection for increased feed intake, improved resistance to endemic disease and meat eating quality, farm performance from the Geneconverter 900 is second to none.