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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

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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

  • addition or loss of plasma membrane proteins and lipids

  • redistribution of proteins and lipids within sperm

  • changes in lipid diffusion coefficients


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 ejaculationSemen CharacteristicsSpecies

Vaginaslight coagulation of ejaculatehuman, rabbit

vaginasemen with high sperm cattle, sheepconcentration

uterusvoluminous, distention of cervixhorse

cervix, uterusvoluminous, retention of penis dog, pigduring copulation

uterusvagina plugrodents


Sperm Loss From Female Tract

  • retrograde flow

  • phagocytosis by neutrophils


Experiment on Retrograde Flow in the Cow

Uterine Horn

Insemination at 3 different spots

Uterine Body

Cervix


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


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

  • coagulation of semen or a plug

  • concentrated semen

  • semen deposited in uterus


Sperm Loss From Female Tract

  • retrograde flow

  • phagocytosis by neutrophils


Neutrophile Infiltration of Uterus


Phases of Sperm Transport

  • rapid

    • 15-30 min

  • sustained

    • 6 - 12 hr

  • oviductal

    • at ovulation


Evidence for Sustained Transport

Ligatures at

Utero-tubal

Junction


Effect of Oviduct Transection on Fertilization in Heifers

Interval from mating* toOocytes Fertilizedtransection of UTJ

60%

850%

1283%

*Mating was done at the start of estrus.


Sperm Transport in the Pig

Percentage of Oocytes Fertilized

}


Ovulation

Oocyte

Cumulus Cells Follicular Fluid


Cue for ovulation may effect isthmus to trigger oviductal transport


18-24 hr

1-2 hr

6-12 hr

Location of Fertilizing Sperm


Barriers To Sperm Transport


Cervix


Barriers To Sperm Transport

Uterotubal Junction


Ovulation

Oocyte

Cumulus Cells Follicular Fluid


Remains closed until

day 3 - 5 post ovulation

Factors Regulating Oocyte Transport in the Oviduct

Fluid Flow


Total Fluid Production

Toward

Ampulla

Toward Uterus


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 videopodcast entitled

Ovulation and Oocyte Transport

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


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