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Table 2 Chromatin damage in stallion spermatozoa indicated by DFI (DNA fragmentation index, %), its standard deviation (SD_DFI) and the measure of single stranded DNA (mean_DFI). Values are expressed as means ± SD of aliquots of extended ejaculates from eleven stallions (n = 37).

From: Sperm morphology and chromatin integrity in Swedish warmblood stallions and their relationship to pregnancy rates

Stallion (no. ejaculates) DFI SD_DFI Mean DFI
A (3) 5.3 ± 0.5 47.7 ± 67.0 278.6 ± 9.4
F (4) 8.7 ± 3.3 48.6 ± 6.6 280.2 ± 16.2
G (3) 9.2 ± 1.4 48.6 ± 7.0 273.9 ± 3.2
H (3) 17.9 ± 4.5 64.0 ± 8.7 291.7 ± 13.1
K (4) 12.5 ± 2.8 58.7 ± 4.6 267.0 ± 6.5
Q (3) 5.7 ± 1.1 46.3 ± 2.8 277.8 ± 4.6
R (3) 8.4 ± 3.6 54.7 ± 6.4 283.6 ± 7.3
T (3) 11.1 ± 6.3 56.3 ± 5.3 287.5 ± 13.1
W (3) 13.9 ± 3.0 86.5 ± 13.4 302.5 ± 14.8
Y (4) 11.4 ± 2.7 56.7 ± 4.1 288.8 ± 4.1
Z (4) 12.6 ± 2.6 86.4 ± 8.1 297.8 ± 9.7
Overall Mean ± SD 11.6 ± 13.4 56.4 ± 14.4 311.0 ± 8.37
Range 4.8–19.0 41.5–98.9 267.7–319.5
  1. Notes: DFI gives a measure of the proportion of spermatozoa with damaged chromatin; SD_DFI is the standard deviation of DFI; mean_DFI is a measure of single stranded DNA. Variation between stallions is statistically significant for DFI and SD_DFI (P < 0.001), variation between ejaculates is significant only for mean_DFI (P < 0.05).