Runs of homozygosity in Italian Holstein bulls: a permutation approach and time-based mapping of the genomic regions potentially under selection.

However, there is a slight difference in the occurrence of longer ROH regions: in the last two ROH length classes (i.e., 8–16 Mb, and > 16 Mb), an increasing trend was found moving from group1 (older animals) to group5 (younger animals).

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This correlation showed a decreasing trend moving from the oldest to youngest animals: 0.74, 0.75. 0.66, 0.60, and 0.59 for group1, group2, group3, group4, and group5, respectively.

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