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Colorado Agriscience Curriculum

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Sperm Picture Labeled Sperm Picture Sperm Comparison Evaluation of ... Colorado Agriscience Curriculum Animal Science Unit 4- Reproduction and Genetics Lesson ... – PowerPoint PPT presentation

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Title: Colorado Agriscience Curriculum


1
Colorado Agriscience Curriculum
  • Animal Science
  • Unit 4- Reproduction and Genetics
  • Lesson 8
  • Fertilization Laboratory Part 2

2
Sperm Picture
Taylor, Robert E., Scientific Farm Animal
Production, 4th ed.
3
Labeled Sperm Picture
  • Sperm are highly adapted for reaching and
    entering the female egg.
  • Head portion contains nucleus and is covered by a
    cap containing enzymes that help penetrate the
    egg.
  • Mitochondria are found in the midpiece of the
    sperm provide energy for locomotion.
  • Tail is a typical flagellum that propels the
    sperm along its way

Taylor, Robert E., Scientific Farm Animal
Production, 4th ed.
4
Sperm Comparison
Stallion Semen
Bull Semen
Domestic fowl
Taylor, Robert E., Scientific Farm Animal
Production, 4th ed.
5
Evaluation of Semen
  • Concentration The number of sperm in an
    ejaculate is measured by using a
    spectrophotometer. By measuring optical density,
    the number of sperm per milliliter can be
    calculated (ABS A.I Manual). This is important
    because if there are few sperm, the chances of
    pregnancy in a female greatly decrease.
  • Motility how well sperm swim. If a sperm has
    two tails, they will work against themselves and
    not be able to swim well. Some sperm that dont
    have any tails cant move at all. Some may even
    swim in circles. These are all bad
    characteristics of sperm, if the goal is to get a
    female pregnant.
  • Sperm Abnormalities Sperm must be normal.
    Sperm with two heads, two tails, no tails, short
    tails, and many other problems can not be used
    effectively to impregnate a female.

6
Technologies used in semen evaluation
  • Spectrophotometer Machine that measures optical
    density, the number of sperm per milliliter can
    be calculated.
  • Compound Microscope Used to observe sperm
    motility and abnormalities.
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