Reproductive physiology of female animals · Polyestrous = female cycles all year round (cow, pig,...
Transcript of Reproductive physiology of female animals · Polyestrous = female cycles all year round (cow, pig,...
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Reproductive physiology of
female mammals I-II.
László Solti, professor emeritus
University of Veterinary Medicine
Department of Reproduction
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Introduction
What is reproduction?
Why is reproduction important?
Development and organization of
reproductive organs (female).
Cyclic function of the female
reproductive organs.
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Reproduction:
a sequence of events
Development of the reproductive system in the embryo
The newborn animal must achieve puberty and acquiring the ability to produce fertile gametes
The animal must show reproductive behavior > estrous, libido, copulation, etc.
Fertilization > development of the early embryo > implantation > development of the fetus
Parturition > lactation (nourishment for the neonate)
Resumption of cyclicity > establishment of a newpregnancy
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Reproductive terms
Andrology: deals with reproduction of male animals + humans (study/treatments of males)
Gynecology: deals with reproductive issues in woman
Theriogenology: deals with reproductive system of animals
Obstetrics: deals with the females before, during and after parturition in the human + animal
An International Journal
of Animal Reproduction
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2. oldal, 1-es abra
Reproductive physiology:
wide area connected to
many fields
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4. Oldal 1-2 abra
History of
reproductive
physiology
900 microscope
9 still in Utrecht
270X
Johann Ham, 1677
„animalcules”
Oocyte + spermatozoa
must be attached
Oocyte + spermatozoa
must be fused
Induced by seminal fluid
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Importance of reproduction
The global challenge is to:
Decrease the rate of the growth of human population
The growth of the human population is cca. 300.000 per day
Increase the efficiency of the reproduction in food-producing animals > there is no production without reproduction!!!!
Educate the public about managing reproductive function in all species
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Benefits of improved reproduction
Improvement in the reproductive rate is a major goal
in food animal production because a 3% increase
would result in:
1 million more beef calves/year
3.2 million more piglets/year
12.58 million L (3.7 million gallons) more milk annually
Litter size in swine
1 calf/13-14 months in dairy industry
1calf/year in beef industry
twin pregnancy in sheep
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Development, anatomyand histology of the femalereproductive organs
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Gonadal sex
In males, the sex is determined by the SRY protein, encoded by a gene, called sex determining region and located on the Y chromosome
Sertoli-cells produce anti-Müllerian factor (AMF) → Müllerian ducts
degenerate;
induce development of Leydig-cells
Leydig-cells produce testosterone which is partly converted into DHT by Sertoli-cells
In females, the SRY + Sertoli-cells are missing and there is no AMF production > Müllerian ducts stay intact + Wolffian ducts degenerate (no testosterone)
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Sex and gender
Sex refers to the biological and physiologicalcharacteristics, while gender refers to behaviors, roles, expectations, and activities in societyExamples of characteristics related to sex:
Females have a vagina, men don't
Males have a penis, women don't
Male newborns tend to weigh more than female newborns
Females can breastfeed their babies, males can't
Males have deeper voices than females
Females can get pregnant, males can't
Males have testicles and females have ovaries
Examples of characteristics related to gender:
Women tend to do more of the housework than their spouses do
A higher percentage of US doctors are women, compared to Egypt
Nursing is often seen as a woman's job, although many men enter the profession
In some countries women have to cover their heads when they go outside the house
120 years ago women were not allowed to vote in elections
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Insulin 3 >
descent of
the tesis
meiotic inhibiting factor(maintains meiotic arrest)
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Introduction to Reproduction
anatomy
histology
endocrinology
regulation
The Organization and Function of
the Female Reproductive Tract
•Ovaries
•Oviducts
•Uterus
•Cervix
•Vagina
•External genitalia
Continuous
tubular
system
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Female reproductive organs
Ovaries: gamete and hormone production
Oviducts: environment for fertilization + early
development of the preattachment embryos
Uterus: sperm transport + early embryonic
development + attachment of the embryo/fetus
Cervix: barrier + mucus production
Vagina: mucus production + copulatory organ
External genitalia (perineal area)
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Structure
The female tract is a series of tubes (oviducts,
uterus, cervix and vagina) and each of them is
organized in concentric layers:
Serosa (outer)
Muscularis
Submucosa
Mucosa (inner)
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Wall structure of thereproductive tract
Senger: Pathways to pregnancy and parturition (3rd ed)
Surrounded by peritoneum (very outer layer)
which continues in the broad ligament
• The broad ligament (BL) (ligamentum latum uteri) houses the blood vessels,nerves, lymphatic drainage;• BL develops from theperitoneum• Mesovarium (aroundovaries)• Mesosalpinx (aroundoviduct)• Mesometrium (arounduterus)
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Advanced Duplex
(Opossum)
Two Uterine
Horns
Two Cervices
Two Vaginas
Duplex
(Rabbit, Mouse)
Two Uterine
Horns
Two Cervices
One Vagina
Bicornuate
(Pig)
Two Uterine
Horns (long)
Common
Uterine Body
One CervixOne Vagina
Bipartite
(Cow, Ewe, Doe)
Smaller
Uterine Horns
Modified Bipartite
(Mare)
Larger Uterine
Body with Smaller
Uterine Horns
Simplex
(Human)
No Uterine
Horn, All
Uterine
Body
Types of internal genital organs
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Placenta types (histological)
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Placentome in Ruminants
Cow
Chorion
Caruncle
Endometrium
Chorion
Caruncle
Endometrium
Ewe
Mare, SowChorion
Microcotyledon
Endometrium
Placentomes
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Senger: Pathways to pregnancy and parturition (3rd ed)
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Senger: Pathways to pregnancy and parturition (3rd ed)
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Senger: Pathways to pregnancy and parturition (3rd ed)
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Ovarian
bursa
Mesosalpinx
completely covers
the ovaries
Senger: Pathways to pregnancy and parturition (3rd ed)
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Senger: Pathways to pregnancy and parturition (3rd ed)
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Ovarianstructures
Estrogen
Inhibin
FSH
receptors
Maturation of the
oocytes
P4 + oxytocin, relaxin, inhibin, activin
AndrogensLH receptors
Corpus hemorrhagicum„bloody body”
Senger: Pathways to pregnancy and parturition (3rd ed)
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Ovulationand CL
formation
Senger: Pathways to pregnancy and parturition (3rd ed)
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Ovulationfossa
• Ovarian medulla and cortex are reversed• F can but CL cannotbe palpated
F and CL can be palpated rectally
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Histologicalstructure of the oviduct
Mucosal folds > Fimbriae
Ostium
Uterotubal junction >Regulate the movementof the embryo(s) into theuterus
Finger-like projections =fimbriae
Senger: Pathways to pregnancy and parturition (3rd ed)
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Structure of the uterus
Serosa/perimetrium
Muscularis/myometrium
Mucosa + submucosa/endometrium
Senger: Pathways to pregnancy and parturition (3rd ed)
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Functions of the uterus
Sperm transport
Luteolysis and control of cyclicity
Environment for preattachment embryo
Feeding the embryos and spermatozoa;
(enhance embryo development and
sperm viability)
Maternal contribution to the placenta
Expulsion of the fetus and fetal placenta
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Structure of
the cervix
The cervix provides:
• a flushing system,
- mucose production
(lubrication + protection)
• a barrier
- controlling sperm transport
- isolation – protection
- cervical seal (viscous
mucus) during pregnancy
Senger: Pathways to pregnancy and parturition (3rd ed)
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Histologicalstructure of the
cranial/caudalvagina
Highly secretory
High E2 > thickening >
1) mechanical protection +
2) prevents microorganism
immigration
Sperm deposition:
Ruminants/carnivores > intravaginal
Pig > intracervical
Horse > intrauterine
Senger: Pathways to pregnancy and parturition (3rd ed)
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Anatomy of the hypothalamus, pituitary and pineal gland
Hormonal regulation of the
female reproductive cycle
Cyclic function of the ovaries
and the reproductive tract
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Tonic and surge centersin the hypothalamus
Senger: Pathways to pregnancyand parturition (3rd ed)
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GnRH-patterns
from the tonic
and surge center
Senger: Pathways to pregnancy and parturition (3rd ed)
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The hypothalamo-
pituitary portalsystem
Connection between
HYP and adeno-hypophysis
Senger: Pathways to pregnancy and parturition (3rd ed)
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Connection
between HYP and
neurohypophysis
No portal system!!!!
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Milk let down is a neuroendocrine reflex
Senger: Pathways to pregnancy and parturition (3rd ed)
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Neural Reflex
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Prenatal „defeminization” of the malebrain and it’s consequences (no surge
center in males, consequently, thehormonal profiles differ between the
two sexes)
Senger: Pathways to pregnancy and parturition (3rd ed)
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Kisspeptin neuronsintegrate various inputs
Kisspeptins are neuropeptides
Secreted by HYP neurons
Stimulate GnRH secretion
Senger: Pathways to pregnancy and parturition (3rd ed)
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Role of kisspeptin neurons inthe regulation of seasonalcyclicity in long-day and
short-day breeders
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Circadian rhythm
„For their discoveries of molecular
mechanisms controlling the
circadian rhythm"
Internal biological clock.Mimosa plants have a cell autonomous clock that can maintain the biological rhythm even under constant conditions (d’Ortous de Mairan, 1729) Feedback regulation of the period gene
The circadian clock has an impact on our physiology
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Basal GnRH-pulse frequencyis elevated after puberty
Senger: Pathways to pregnancy and parturition (3rd ed)
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Gonadotropindependency of different tertiary
follicles
Effects of E2 and inhibin on thehypothalamus and pituitary
Senger: Pathways to pregnancy and parturition (3rd ed)
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Wave-like pattern of folliculardevelopment in the cow
Senger: Pathways to pregnancy and parturition (3rd ed)
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Follicularwaves
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The „two cell-twogonadotropin” model of estrogenproduction of tertiary follicles
Senger: Pathways to pregnancy and parturition (3rd ed)
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Induced
ovulation
Senger: Pathways to pregnancy and parturition (3rd ed)
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Cyclicity profile of qeens
(induced ovulator)
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PGF2α bound to lutealreceptors induces apoptosis
Senger: Pathways to pregnancy and parturition (3rd ed)
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Effects of
progesterone
Senger: Pathways to pregnancyand parturition (3rd ed)
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Progesterone primes the brainfor the effects of estradiol
Senger: Pathways to pregnancy and parturition (3rd ed)
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1. Hormone receptor binding2. Activation of adenylate cyclase3. Protein kinase activation4. Synthesis of new product
Senger: Pathways to pregnancy and parturition (3rd ed)
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Fast response1. Steroid binding to
membrane receptors2. Activation of adenylate
cyclase3. Protein kinase activation4. Synthesis of new product
Slow response1. Steroid transport2. Movement through the
cell membrane and cytoplasm
3. Binding of steroid tonuclear receptor
4. mRNA synthesis and protein synthesis
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Types of reproductive cycles
Length of the cycle: sheep 16-17 d, most mammals 20-21 d, primates 28-37 d
Receptive/receptivity = accepts the male for mating
Polyestrous = female cycles all year round (cow, pig, human, etc)
Seasonal polyestrous = cycles in a particular season of the year
Monoestrous = has only 1 or 2 cycle in a year
Anestrous/lactational anestrous = pregnancy/lactation (beefcattle, pig, human)
No lactational anestrus = mare (1 week), dairy cow (3 weeks), small ruminants/dogs (longer time) > postpartum resumption of cyclic ovarian function
Small cycle = estrous cycle
Big cycle = from fertilization (pregnancy, parturition, lactation, resumption of cyclic ovarian function) to the next fertilization
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Types of oestrous cycles
(E2 profiles)
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Seasonality
Cyclicity is in connection with daylength > melatonin(M) production by the pineal gland
Long day breeders: decreased M induces cyclicity(horse)
Short day breeders: increased M induces cyclicity(sheep, goat)
Monoestrus: 1 or 2 cycle/year; spring period (dog)
Anestrus: physiological (pregnancy, lactation, seasonality, dog has long anestrus (4-6 months)
Pathological causes: stress, endometritis, systemicdisease, ovarian tumor, energy deficit, starvation, etc.
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Seasonality
• Circannual species (small ruminants, deer, somerodents)
They have biological clock, which induces cyclicity aroundthe same time of the year
• Not circannual species (mice, rat)
Continues photostimulation can maintain cyclicity all yeararound regardless of the season
• Light programs
Can be used in order to induce earlier the cyclicity in theyear
• Melatonin implant is used in small ruminants in orderto induce cycling in non-breeding season
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Melovine implant (18 mg melatonin)
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Chronogest vaginal sponge
Day 0. Sponge/implant introduced
Day 12-14. Removal of sponge/implant + 400-500 IU eCG
+ 24 hr vasectomized ram in
+ 48 hr AI with fresh semen, or
+ 53-58 hr AI frozen semen
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Types of reproductive cycles
1. Estrous cycle: 21 (17) days long
Estrus > female shows behavioral changes + observable signs of heat > accepts themale for copulation; Day 0 is the time of estrus
2. Menstrual cycle: 28 (37) days longSpecific sign > mestrual bleeding (menses)Day 0 is the mensesPrimates (+ humans) + elephant have
this type of cycle
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Menstrual cycle (MC) in general
Onset of MC (menstrual periods)
OWM: 4 years of age (rhesus)
Great apes: 8-10 (in captivity: 6-7) years of age
Human: 11-14 years of age
But: genetical factors, nutrition, climate
Duration of MC
Orangutans: 29 days (4-6 days)
Baboon: 32 days (3-4 days)
Gorillas: 30 days (2-3 days)
Chimpanzee: 37 days (10-14 days)
Woman: 28 days (4-7 days)
Big individual differences
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Estrous cycle
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Phases of the estrous cycle
Senger: Pathways to pregnancy and parturition (3rd ed)
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Stages of the estrous cycle
Dog = 9 days
Cow = 1 D
Mare = 5-7 D
Sow = 3 D
Dog = 2 months
Senger: Pathways to pregnancy and parturition (3rd ed)
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Menstrual cycle
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Differences
between the
estrous and
menstrualcycles
Senger: Pathways to pregnancy and parturition (3rd ed)
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Mitotic and meiotic divisonsof oogonies and the oocyte
Senger: Pathways topregnancy and
parturition (3rd ed)
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Main hormones in
female reproduction
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Main hormones in the
regulation of reproduction
P4
Dehydroepiandrosterone, androstenedion, testosterone
E2
Inhibin, activin
PGF2α
Relaxin
Insulin, IGF-2, leptin
Prolactin
FSH, LH, eCG, hCG
Oxytocin, GnRH
Melatonin
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Melatonin is regulated by light
Senger: Pathways to pregnancy and parturition (3rd ed)
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Melatonin
Structure: amino acid derivate
Site of synthesis: Pineal gland (dark hours of the day)
Precursor: produced through many steps from tryptophan
Synthesis:
light stimulation → retina > transmitted through the optic nerve to thesuprachiasmatic nucleus > an inhibitory neuron is stimulated > noradrenergic neurons will be blocked > pinealocytes will not be stimulated > melatonin production ↓;
during dark hours the activity of the inhibitory neuron ↓> norepinephrin + melatonin production ↑
Role in reproduction: regulation of the seasonality of reproduction;
Regulation of the GnRH production and release
Long-day breeders (horse): light > melatonin production ↓ > GnRH ↑
Short-day breeders (sheep): decreasing light stimulation result in increasing melatonin production/release
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Oxytocin and GnRH
Structure:
1) Oxytocin consists of 9 amino-acid (peptide);
2) GnRH consists of 10 amino-acid (decapeptide) > neuropeptides
Synthesis:
1) oxytocin is produced in HYP > paraventricular nucleus,
and is released into blood vessels in the neuro-hypophysis
2) GnRH is produced in the HYP > tonic and surge centers
Oxytocin is also produced by the CL (luteolyses)
Half-life of both hormones are very short!!!
Role in reproduction: smooth muscle contraction, follicular
development, luteolysis, etc.
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Pituitary (FSH, LH) and extrapituitary (eCG, hCG)
gonadotropins
Structure: glycoprotein hormones (α and β peptid
chain); the α chain is the same in all four hormones
Site of synthesis: FSH/LH → adenohypophysis; eCG
(PMSG) → endometrial cups, Days 35-140; hCG →
trophoblast cells in the human embryo
Receptors: FSH → granulosa cells of tertiary F3; LH
→ granulosa cells of dominant F - luteal cells of CL
eCG → FSH receptors; hCG → LH receptors
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Prolactin (PRL)
Structure: Protein hormone
Site of synthesis: lactotroph cells in the anterior pituitary,
regulated by dopaminergic neurons of HYP (dopamin
inhibits PRL release)
Role in reproduction: together with growth hormone, E2 and P4 stimulates the development of mammaryglands; induces milk production + placental lactogensecreted by placenta; in dogs it has a luteotropiceffect (supports CL); negative effect on the activity of GnRH neurons (dog, human); high PRL decreaseslibido (e.g. lactating mothers)
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Progesterone
(P4)
Structure: steroid hormone
Site of synthesis: Luteal cells of the CL and the placenta
Synthesis: cholesterol – pregnenolon – P4
Transport in the blood: P4 is in complex withtranscortin/albumin
Metabolism: excreted in the urine and/or faces after hydroxy-
lation and conjugation with glucuronic acid or sulfate
Cholesterol Pregnenolone
Progesterone
P4 + synthetic derivates =
gestagens
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Dehydroepiandrosterone(DHEA), androstenedion,
testosteroneStructure: steroid hormones > androgenes
Site of synthesis: theca cells, follicles;
DHEA + androstenedion in adrenal cortex too;
They can be aromatized into E2 in the ovaries.
Precursor of synthesis: androstenedion can be
synthesized from pregnenolone through P4 or
DHEA, then it is further converted into testosterone
Testosterone dihydrotestosterone
Transport (blood): in complex with globulin SHBG
Metabolism: converted into E2, then conjugated
with glucuronic acid/sulfate, secreted into urine
DHEA
Androstenedione
Testosterone
5α-reductase
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Estradiol (E2)
Structure: steroid hormone
Site of synthesis: granulosa cells of the tertiary follicles + placenta
Precursor of the synthesis: androgens, aromatisation
by the aromatase enzyme, conversion of androgens
into E2
Transport (blood): SHBG + albumin
Metabolism: Estradiol converted into less potentestrone
(E1) or estriol (E3), then conjugated with glucuronic
acid/sulfate, secreted into urine!! or feces
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Inhibin, activin
Structure: protein hormones, built up from two chains and belong
to the family of transforming growth factors (TGFs)
Site of synthesis: granulosa cells of dominant follicles + placenta.
Inhibin is also synthesized by the luteal cells of CL
Role in reproduction: activin receptor, activin – FSH ↑ + follicular
growth; inhibin – FSH ↓
Vaccination against inhibin: FSH ↑, # of preovulatory follicles ↑
Fecundity genes in Booroola breeds (FecB, FecX) decrease the
inhibin level
# of twin pregnancies ↑
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Prostaglandin F2α
Structure: arachidonic acid derivative
Site of synthesis: endometrial tissue
Role in reproduction:
- luteolysis,
- smooth muscle contraction (myometrium) > promotes involution
- side effects (intestines, blood vessels) > horse
- half life: 30 sec
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Prostaglandin E2 (PGE2)
It has role in ovulation (in every species)
Dog: produced by CL, autocrine
luteotrophic factor beside PRL
Horse: supports the migration of the
embryos (relaxes the smooth muscle!!)
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Relaxin
Structure: protein hormone
Site of synthesis: CL and placenta
Role in reproduction: relaxes the uterine smooth
muscles (except the last few weeks), supports
pregnancy, relaxes the pelvic ligament, softens the
cervix and widens the pelvic bones before
parturition
In canine, the relaxin is pregnancy specific → indicates
pregnancy
Pregnancy determination in canine: US + relaxin test
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Insulin, IGF-2, leptin
Structure: protein hormones
Site of synthesis:
- Insulin: B-cells of pancreatic Langerhans-islets;
- IGF-2 (insulin-like growth factor 2): hepatocytes +
ovarian theca cells (induced by growth hormone);
- Leptin: mature adipocytes
Role in reproduction:
- Insulin + leptin are indicators of the nutritional status;
- Leptin takes part in the induction of puberty stimulatesGnRH-release (well fed females show cyclicity);
- IGF-2 takes part in the regulation of follicular growth