AnimalDairy Science 434 Lec 2 Female comparative anatomy

Animal/Dairy Science 434 Lec 2: Female comparative anatomy; History of Reproductive Physiology Kangaroo Rat Human

Ovarian Differences Mare Cow Sow

Cow Cow, Sow, Ewe, Human • Cortex on outside • Ovulation can occur on any point of the ovary Mare • Inversion of the cortex and medulla. • Ovulation occurs at the Ovulation Fossa Preovulatory Tertiary Follicle Internal CL Mare Sow Blood vessels and connective tissue in medulla

Uterine and Cervical Differences Sow Cow Mare

Advanced Duplex (Opossum) Duplex (Rabbit, Mouse) Two Uterine Horns Two Cervices Bicornuate (Pig) Two Uterine Horns (long) Two Cervices One Vagina Common Uterine Body One Cervix Two Vaginas One Vagina Smaller Uterine Horns Bicornuate (Cow, Ewe, Doe) No Uterine Horn, All Uterine Body Simplex (Human) Larger Uterine Body with Smaller Uterine Horns Bicornuate (Mare)

Human Tract

Human Tract

Mare SOW Uterine Body Longitudinal Folds There are no obstacles in the mare after the fornix vagina Cervix Sow cervix has many interdigitating pads Note: Sow does not have fornix vagina Os Cervix Fornix Vagina

Cervix COW Internal Os Cervical Ring Fornix External Os Anterior Vagina EWE Fornix Anterior Vagina

Cervix Cervical Folds FV IP Sow Mare

External Genitalia Mare Cow Sow Ewe

Human Tract

External Genitalia

Vagina Anterior Vagina Posterior Vagina (Vestibule) Cervix Fornix Columnar Epithelium Urethra Stratified Squamous Epithelium Vulva. Vaginal Sphincter Mucosa Submucosa

Avian Female Anatomy Ovary Infundibulum perivitelline membrane chalazae albumen Magnum Oviduct shell membrane Isthmus Uterus Shell Gland Intestine Right Oviduct cleaving blastodisc vagina shell cloaca Left side of Reproductive Tract Develops!!

Chicken Ovary Hierarchical Follicular Status

Chicken Tract Shell Gland Oviduct Ovary

Historical Development of Reproductive Physiology Aristotle 384 -322 BC • Fetus arises from Generation of Animals menstrual blood • Seminal plasma initiates the conversion of menstrual blood • Semen from all parts of body

Historical Development of Reproductive Physiology • Fallopius (1562) – Describes the oviduct • Coiter (1573) – Describes the corpus luteum • Regnier de Graff (1672) – Describes the antral follicle (Graafian Follicle) • van Leewenhoek (1677) – Develops the microscope – Describes spermatozoa in semen

Historical Development of Reproductive Physiology • Spallanzani (1780) – Sperm were the fertilizing agent in semen – Successful artificial insemination of a dog • Dumas (1825) – Proves sperm the fertilizing agent

Modern Reprod. Physiology • • • Gonads produce steroid hormones Cyclicity in females Radioimmunoassay (RIA) Artificial Insemination Semen Cryopreservation Prostaglandin used to control estrous cycles • Biotechnology

Approach to Applications • Develop basic knowledge of how system works • Investigate methods that can perturb the system • Manipulate the system to improve reproduction

Enhancing Reproduction • Small improvements have profound effects on production – 3% improvement in birth rate results in an additional: • 1 million beef calves/year • 3. 2 million pigs/year • 3. 7 million gallons of milk/year

Current Trends Metabolic and Production Physiologic Changes Reproduction • Continuing need to: – improve reproductive performance – understand how to apply new technology

Limiting Reproduction Insects Humans Wildlife Pets