734 — Semen Viability & “Semen Math”: Maximize Success with Fresh, Chilled & Frozen

Semen Viability & “Semen Math”: Maximize Success with Fresh, Chilled & FrozenDr. Marty Greer returns to break down semen viability, the six parameters of semen analysis, practical “semen math,” and strategies for maximizing success with fresh-chilled and frozen semen.Marty joins Laura to demystify semen viability and the practical realities of breeding with fresh, chilled and frozen semen. Whether you’re a first-time breeder or seasoned pro, this conversation delivers veterinary-backed guidance on how to assess semen quality, plan collections and protect valuable genetic material.Key topics covered:Semen Math: Dr. Greer walks through the core formula: ejaculate volume × sperm concentration × percent motile × percent morphologically normal (× post-thaw survival for frozen samples) to determine total usable sperm and number of breeding units. Use this to decide when to freeze, how many straws/pellets equal a true breeding unit, and when to be conservative with limited inventory.Six parameters of semen analysis: ejaculate volume, gross appearance, sperm count, morphology, motility (directional swimming vs. circular or backward movement), and longevity. Why each matters and what incomplete reports (e.g., “plenty here”) really mean.Fresh vs. frozen considerations: why you shouldn’t “clean out” a male the night before collection; why freezing early (when the dog is young and virile) is critical; how older dogs and fragile semen tolerate freeze-thaw poorly; and breed- and individual-level variability in freeze tolerance.Practical troubleshooting for failed frozen breedings: confirm historic fertility, review original collection age/count/post-thaw stats, check packaging (straws vs. pellets) and breeding-unit definition, and discuss TCI vs. surgical options with your repro clinic.iSperm and accessibility: overview of affordable, tablet-based semen analyzers as a community tool for clinics and breeders to get reliable counts.Small, actionable tips: warming slides for motility checks, thermal risks to sperm, timing for clean-out collections, and using anti-inflammatory protocols that some clinics employ with compromised breedings.