As the foundation upon which JSR Genetics’ worldwide reputation has been built, our dam lines are the source of the valued attributes represented by our range of top quality breeding stock and semen.

The result of years of careful selection, our dam lines help to ensure that our customers can continue to meet the challenges of a changing market place and succeed within a global industry.

Genepacker 1 - Large White

The JSR Large White dam is a strong, robust and prolific dam line that has been successful across the globe.The Genepacker 1 dam line has been part of JSRs success across the globe and is renowned for its reliable and manageable performance.

Contributing as one half of the cross into the JSR Genepacker 90 gilt, the high yielding output coupled with its smaller mature size and hence lower maintenance requirements compared to other genetics means greater profits for pig producers wherever they are in the world.

Genepacker 1 - Large White

Genepacker 2 - Landrace

The JSR Landrace is the matriarch of the JSR breeding pyramid. Contributing equally to the JSR Genepacker 90 and JSR Genepacker 150 F1 parent gilts, this animal is the very foundation of our successful females, performing across a range of farm environments.

Selected and known for prolificacy the Genepacker 2 is also widely recognised for its temperament, mothering abilities and capability of rearing the large litters that it produces. The Genepacker 2 is JSRs most productive dam line and is developed using information collected across the entire JSR pyramid.

Genepacker 2 - Landrace

L Line – Landrace

The L Line is a pure Norsvin Landrace dam line that has been bred since 1958 with no influence of any other genetics. Now developed by our genetics partners Topigs Norsvin, the L Line has been selected to combine slaughter pig efficiency and sow productivity. A prolific dam line that is recognised for its temperament and mothering ability.

  • Prolific: high weaning ability
  • Superior feed efficiency
  • High carcass quality
  • Lean growth

Z Line – Large White

The Z line is a pure bred dam line originating from the Large White; developed by our genetics partners Topigs Norsvin. Selected and known for prolificacy, the Z line is also widely recognised for its excellent mothering abilities and capability of rearing the large litters that it produces. Renowned for its reliable and manageable performance, the Z line continuously produces large numbers of lean and efficient progeny.

  • High fertility and low mortalities
  • Easy to manage and robust sow
  • Excellent mother

White Duroc

The White Duroc is a strong and vigorous line developed with genetic partners in the US and is a key component in our JSR Genepacker 150 outdoor F1 gilt. The White Duroc brings a strength and robustness to our female to ensure it continues to perform in the harshest of British winters.

Most recognisable due to its legendary leg strength, the White Duroc allows outdoor producers to achieve higher levels of prolificacy without increased sow mortality in the outdoor conditions. It also enables the most profitable coloured terminal sires to be used on outdoor gilts without deductions for pigmentation on slaughter contracts.