Table 1 Trait list, definitions, and summary statistics of beef bull fertility traits collected at an artificial insemination. All post-thaw motility measures are observed the day after the sample is collected. All traits are measured within one hour except for three-hour post-thaw motility
From: Genome-wide association study of beef bull semen attributes
Trait | Units | Definition | N | Mean | Std Dev | Minimum | Maximum |
|---|---|---|---|---|---|---|---|
Volume (VOL) | mL | total amount of the ejaculate, measured by milliliters | 44,431 | 7.96 | 4.22 | 0.10 | 74.00 |
Concentration (CONC) | Million/mL | relative amount of sperm cells per ejaculate, measured by a colorimeter | 44,038 | 1021.16 | 495.02 | 10.00 | 3906.00 |
Number of spermatozoa (NSP) | Million | calculated by multiplying sperm concentration and semen volume; expressed in millions | 44,418 | 49.18 | 16.16 | 0.00 | 100.00 |
Initial Motility (IMot)a | % | percentage of progressively swimming spermatozoa in the ejaculate immediately after collection | 44,038 | 8004.18 | 5519.61 | 64.50 | 69,795.00 |
Post-thaw Motility (PTMot)a | % | percentage of progressively swimming spermatozoa in the ejaculate, measured within one hour of thawing | 29,877 | 43.53 | 13.78 | 0.00 | 75.00 |
Three-hour post-thaw motility (3HRPTMot)a | % | percentage of progressively swimming spermatozoa in the ejaculate, measured three hours after thawing | 8299 | 15.72 | 12.48 | 0.00 | 60.00 |
Percentage of Normal Spermatozoa (%NORM)a | % | percent morphologically normal spermatozoa | 19,455 | 75.18 | 8.37 | 2.00 | 100.00 |
Primary Abnormalities (PRIM)a | % | percentage of spermatozoa with a defect to the head | 19,452 | 13.00 | 7.53 | 0.00 | 100.00 |
Secondary Abnormalities (SEC)a | % | percentage of spermatozoa with a defect to the tail | 19,521 | 12.09 | 7.70 | 0.00 | 100.00 |