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Animal Science 434. Lecture 15: Gamete Transport. Muscle Contractions. Cilia Fluid Flow. Fluid Flow. Sperm Transport in the Male Tract. Sperm Transport in the Male Tract. Acquisition of Fertilizing Ability and Motility. No protein synthetic ability

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animal science 434

Animal Science 434

Lecture 15: Gamete Transport

sperm transport in the male tract

Muscle

Contractions

Cilia

Fluid Flow

Fluid Flow

Sperm Transport in the Male Tract
sperm transport in the male tract3
Sperm Transport in the Male Tract

Acquisition of

Fertilizing Ability

and Motility

  • No protein synthetic ability
  • addition or loss of plasma membrane proteins and lipids
  • redistribution of proteins and lipids within sperm
  • changes in lipid diffusion coefficients
sperm transport in the male tract4

Addition of DF From Accessory Gland Secretions

Sperm Transport in the Male Tract

Addition of Decapacitation Factor

  • Decapacitation Factor
  • protein, glycolipid and/or lipid
  • stabilizes the plasma membrane
site of ejaculation
Site of Ejaculation

Site of ejaculation Semen Characteristics Species

Vagina slight coagulation of ejaculate human, rabbit

vagina semen with high sperm cattle, sheep concentration

uterus voluminous, distention of cervix horse

cervix, uterus voluminous, retention of penis dog, pig during copulation

uterus vagina plug rodents

sperm loss from female tract
Sperm Loss From Female Tract
  • retrograde flow
  • phagocytosis by neutrophils
experiment on retrograde flow in the cow
Experiment on Retrograde Flow in the Cow

Uterine Horn

Insemination at 3 different spots

Uterine Body

Cervix

slide8

Uterine Body

Uterine Horn

20

15

Cumulative % Sperm Recovered

From the Vagina

10

Cumulative % Sperm

Recovered From Vagina

5

0

0

1

2

3

4

5

6

7

8

Hour After Insemination

slide9

Cervix

Uterine Horn

60

50

40

Cumulative % Sperm Recovered

From the Vagina

30

cervix

20

10

0

0

1

2

3

4

5

6

7

8

Hours After Insemination

Hour After Insemination

evolutionary strategies for dealing with retrograde flow of semen
Evolutionary Strategies for Dealing With Retrograde Flow of Semen
  • coagulation of semen or a plug
  • concentrated semen
  • semen deposited in uterus
sperm loss from female tract11
Sperm Loss From Female Tract
  • retrograde flow
  • phagocytosis by neutrophils
slide13

Phases of Sperm Transport

  • rapid
    • 15-30 min
  • sustained
    • 6 - 12 hr
  • oviductal
    • at ovulation
slide14

Evidence for Sustained Transport

Ligatures at

Utero-tubal

Junction

effect of oviduct transection on fertilization in heifers
Effect of Oviduct Transection on Fertilization in Heifers

Interval from mating* to Oocytes Fertilized transection of UTJ

6 0%

8 50%

12 83%

*Mating was done at the start of estrus.

sperm transport in the pig
Sperm Transport in the Pig

Percentage of Oocytes Fertilized

}

slide17

Ovulation

Oocyte

Cumulus Cells Follicular Fluid

slide19

18-24 hr

1-2 hr

6-12 hr

Location of Fertilizing Sperm

slide24

Barriers To Sperm Transport

Uterotubal Junction

slide26

Ovulation

Oocyte

Cumulus Cells Follicular Fluid

slide30

Total Fluid Production

Toward

Ampulla

Toward Uterus

factors regulating oocyte transport in the oviduct31
Factors Regulating Oocyte Transport in the Oviduct

Site of

Fertilization

No

Contractions

Cilia

Muscle

Contractions

Fluid Flow

Remains closed until

day 3 - 5 post ovulation

now view the video podcast entitled

Now view the videopodcast entitled

Ovulation and Oocyte Transport

Obtain from [email protected] podcast links for this course in the Lecture area.

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