Genetic linkage across herds and years is critical to breeding programs which utilize Breeding Values (BVs) to provide a measure of genetic worth. Linkage through the use of common sires (i.e. same sires used between farms and/or years) allows for statistical adjustment of environmental differences between farms (or years) in performance of progeny. This adjustment of environmental effects means that all animals in a well linked analysis can be directly compared. Without good linkage the relativity of BVs produced between years or herds cannot be established and year-to-year or herd-to-herd data cannot be directly compared.
Deer Select linkage graphs
How is the deer industry improving linkage?
How can a breeder improve linkage?
Example of a Linkage graph
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