Ejaculate quality of studs also appeared affected ... with outbred males producing a greater average sperm count/ ejaculate and sperm count/ml of ejaculate. Ejaculate volume, % motility of spermatazoa and testes volume, although not significantly different, also favoured the outbred compared to inbred sires.'
Influence of Inbreeding on Reproductive Performance, Ejaculate Quality and Testicular Volume in the Dog (1982) D. E. Wildt, et al
'Gene pool restriction and genetic inbreeding in the remaining small population of red wolves may be a factor in the observed degradation in sperm quality'
Semen parameters and electron microscope observations of spermatozoa of the red wolf, Canis rufus (1998) J. K Koehler, et al