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In mammals, the Y chromosome plays a pivotal role in male sex\uddetermination and is essential for normal sperm production. A number of\udstudies were conducted on Y chromosome genes of various species and\udidentified single-copy and multi-copy genes. However, limited studies\udabout donkey Y chromosome genes have been done. In this study, 263 male\udsamples from 13 Chinese donkey breeds were collected to analyze the copy\udnumber variations (CNVs) of five Y chromosome genes using the quantitative PCR\ud(qPCR) method. These five genes (cullin 4 B Y (CUL4BY),\udequus testis-specific transcript y1 (ETSTY1),\udequus testis-specific transcript y4 (ETSTY4), equus testis-specific transcript Y 5\ud(ETSTY5), and sex-determining region Y (SRY) were identified as\udmulti-copy, whose median copy numbers (MCNs) were 5, 45, 2, and 2, and\ud13 with CNV ranges of 1–57, 1–227, 1–37, 1–86 and 1–152, respectively. The\udCNVs of these five genes were shared in different breeds. Compared to\udprevious studies, the copy numbers of five genes showed some distinct\udconsequences in this study. In particular, the well-known single-copy SRY gene\udshowed CNVs in donkeys. Our results provided genetic variations of donkey Y\udchromosome genes

Copy number variations of five Y chromosome genes in donkeys