mammalogy ( fall 2013 althoff - reference fdvm chapter 10)
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Mammalogy ( Fall 2013 Althoff - reference FDVM Chapter 10). LEC 08B. Reproduction - Again A closer “real” look at : __________________ _______________ within an ovary ___________________ in the uterus ___________________ w ithin an ovary __________________ left in uterus. - PowerPoint PPT PresentationTRANSCRIPT
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Reproduction - Again
A closer “real” look at:__________________
_______________ within an ovary___________________ in the uterus
___________________ within an ovary__________________ left in uterus
Mammalogy (Fall 2013 Althoff - reference FDVM Chapter 10)
LEC 08B
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Possible additional role of placenta• Most emerging research on this comes from study
of humans and genetically-engineered mice. Using both blood and spinal fluid from human babies to compare hormone profiles between premature and full-term human babies.
• Important for _____________________• Two key hormones identified so far:
a) ___________—helps nerve cells to grow… so impact is beyond maintaining
endometrium b) ___________—protects fetal neurons from becoming overexcited and dying…so impact is beyond contracting uterus & milk letdown
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OVARY(stained with haematoxylin and eosin)
GENERAL VIEW
1 - cortex2 - medulla3 - area where primordial follicles are located4 - primordial follicles
5 - secondary follicles6 - tertiary follicles7 - mature follicles (Graafian follicles)8 - atretic follicles
Primordial follicle = “not yet spent”, in state of dormancyAtretic follicles = never will matureMature follicles = ready to “erupt”Secondary & tertiary follicles: “between “primordial & mature”
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Primordial follicles
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Graffian follicle – close to “release”
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Ovary with “release” site – will become ______________
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Ovary with corpus luteum
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Ovary with corpus lutea (plural; _________ is corpus luteum)
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Ovary with corpus lutea (plural; singular is corpus luteum)
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Buss and Smith (1966) - Elephant CL and CRJournal of Wildlife Management 30:375-388
Corpora lutea&
Corpora _______
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Positioning of“implanted”
embryosthat become
fetuses.
“Implanted” = ________________________________________
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Site where placenta – fetuswere “connected”…
area heavily pigmented,resulting in
______________________
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ovaries
right sideleft side
cervix
Viewbeforehorns
“opened”
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ovaries
right sideleft side
cervix
Viewafter
horns “opened”
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IUP Hypothesis• IUP = __________________________• Determined to affect a variety of behavior
patterns in female rodents and suspected for non-rodent species that have litter sizes >3
• IUP involves the location of a fetus of one sex with respect to its littermates
• Key results: amount of exposure to ______________________________ ______________________________
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__________ = no males either side of her
__________= 1 males on one side of her
_________ = males on eachside of her
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OF male
OF male
1F male
2F male
2F male
1F male
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IUP Hypothesis…effects• Females exposed to more pre-natal
testosterone may ___________________ _________ than littermates receiving it
• Females more _________________ as littermates including post-weaning
• Female (gerbils) shown to produce more male offspring if 2M females vs. 1M- or 0M-females…2F females produce more female-biased sex ratios vs. 2M females
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Carlson N., editor. 1998. ed. Physiology of Behavior. 6th
edition Allyn and Bacon, Boston, Massachusetts
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Argente et al. 2003. Journal of Animal Science 81:265-273.
Number of blood vesselsto individual fetuses_________ overall_________ at birth
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In summary…• Look for “evidence” of reproductive activity in the
_________• Look for CL (or CR) for evidence of near-full or
full-term pregnancies in the _________ • Look for _______________ for evidence of near
full-term or full-term individual fetuses• ________________, relative to sex of adjacent
fetuses, may affect development and aggressive behavior of females post-partum
• _____________________ at/near a implantation site (of a fetus) can result in increased birth weight for that individual.