Collecting and Handling Semen 4-H Veterinary Science Extension Veterinary Medicine Objectives Describe methods for semen collection List the steps for handling semen for freezing Purpose Evaluation Increases economic rewards Evaluate breeding soundness Breed artificially Storage Increase bred animals Reduce disease transmission Semen Collection Species dependent Types Artificial vagina (AV) Electroejaculator Palpation of accessory glands Keep warm Avoid light AV Rigid tubular structure Jacket Filled with water Tube on end Ideal Good sperm quality Electroejaculator Sends electrical impulses Inserted rectally Lower sperm quality Poor libido males Palpation Seminal vesecles Epididymis Ampulla Vesicular glands Prostate gland Cowper’s glands Bull and Ram Collect with Electroejaculator AV Palpation Mount Castrated animal Cow/ewe Dummy Stallions Collect with AV Condoms Mount Mare Dummy (most common) Boar Collect with AV (modified) Gloved hand technique (most common) Electroejaculation (anesthetize) Dogs and Cats Dogs Manual collection Cats AV collection Semen Evaluation Macroscopically Grossly Color Creamy, white or gray Volume Depends on age and species Consistency Concentration Microscopically Sperm motility Forward motion Concentration Morphology Macroscopic evaluation Motility Morphology Normal sperm composed of a head, mid- piece, and tail Abnormalities in Semen May swim in circles or in place Conformational problems Primary defects Originate in testicles more serious Secondary defects Acquired as sperm pass through the tubules and ducts of repro system also by poor handling Large number of either type may result in decreased fertility Extending Diluted for insemination or for storage Only highest quality of pure substances of various compounds should be used Increases the number of females to be bred with single ejaculate Provides energy source and protection Extenders include egg yolk phosphates, egg yolkcitrate, tris, homogenized milk, or cream and if frozen for long term glycerol Sometimes antibiotics are includes to prevent contamination of sperm Storing Cool slowly Prevent cold shock Preserve viability Stored -130oC prevents crystal formation Accomplished by liquid nitrogen process called cyrostorage Various methods Straws Storing Divided in ½ or 1 ml fractions 20 million cells per straw Labeled and placed into canes in canisters within liquid nitrogen tank Canisters are numbered for records Thawing Quickly Warm water 10-30 seconds Ice water Few minutes