A sheep BAC library of over three genome equivalents was constructed and ar
rayed in superpools and row, column, and plate pools. The library contains
90,000 clones distributed in 39 superpools. The average insert size was est
imated at 123 kb. The library was screened by PCR with 77 primer pairs corr
esponding to ovine microsatellites distributed throughout the genome. The p
robability of finding a random sequence in the library could be estimated a
t 0.96.