The grandparents and 46 haploid progeny of a single female were screened for a total of
272 DNA markers. A total data set containing 12,512 individual genotypes were obtained
and transformed into the two phases, M and P, to satisfy the requirements of the software.
Most markers tested showed detectable linkage to another marker with a threshold of
LOD 2.8 and a 95% limit, except for the four markers that were not linked to any other
marker. The linkage map (Fig. 1) consists of 50 linkage groups (LG) spanning 4111 cm.
The biggest group is 227 cm long and the smallest group is only about 11 cm.
A total of 107 gene markers were mapped on the genetic linkage map, with some genes
known to be important for economic traits. For example, the growth hormone gene was
mapped on LG36, gonadotropin1 on LG1, gonadotrophin2 on LG29 and cysteine
proteinase on LG36.