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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 l.jpg

Animal Science 434

Lecture 15: Gamete Transport


Sperm transport in the male tract l.jpg

Muscle

Contractions

Cilia

Fluid Flow

Fluid Flow

Sperm Transport in the Male Tract


Sperm transport in the male tract3 l.jpg
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 l.jpg

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 l.jpg
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


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Sperm Loss From Female Tract

  • retrograde flow

  • phagocytosis by neutrophils


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Experiment on Retrograde Flow in the Cow

Uterine Horn

Insemination at 3 different spots

Uterine Body

Cervix


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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


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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


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Evolutionary Strategies for Dealing With Retrograde Flow of Semen

  • coagulation of semen or a plug

  • concentrated semen

  • semen deposited in uterus


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Sperm Loss From Female Tract Semen

  • retrograde flow

  • phagocytosis by neutrophils



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Phases of Sperm Transport Semen

  • rapid

    • 15-30 min

  • sustained

    • 6 - 12 hr

  • oviductal

    • at ovulation


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Evidence for Sustained Transport Semen

Ligatures at

Utero-tubal

Junction


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Effect of Oviduct Transection on Fertilization in Heifers Semen

Interval from mating* to Oocytes Fertilized transection of UTJ

6 0%

8 50%

12 83%

*Mating was done at the start of estrus.


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Sperm Transport in the Pig Semen

Percentage of Oocytes Fertilized

}


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Ovulation Semen

Oocyte

Cumulus Cells Follicular Fluid



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18-24 hr transport

1-2 hr

6-12 hr

Location of Fertilizing Sperm



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Cervix transport


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Barriers To Sperm Transport transport

Uterotubal Junction


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Ovulation transport

Oocyte

Cumulus Cells Follicular Fluid


Factors regulating oocyte transport in the oviduct l.jpg

Remains closed until transport

day 3 - 5 post ovulation

Factors Regulating Oocyte Transport in the Oviduct

Fluid Flow


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Total Fluid Production transport

Toward

Ampulla

Toward Uterus


Factors regulating oocyte transport in the oviduct31 l.jpg
Factors Regulating Oocyte Transport in the Oviduct transport

Site of

Fertilization

No

Contractions

Cilia

Muscle

Contractions

Fluid Flow

Remains closed until

day 3 - 5 post ovulation


Now view the video podcast entitled l.jpg

Now view the video transportpodcast entitled

Ovulation and Oocyte Transport

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


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