Review of Reproductive Review of Reproductive Physiology Physiology Jeffrey S. Stevenson, Ph.D. Jeffrey S. Stevenson, Ph.D. Ontario Association of Ontario Association of Bovine Practitioners Bovine Practitioners Reproductive Symposium Reproductive Symposium Department of Animal Sciences and Industry
Ontario Association of Bovine Practitioners Reproductive Symposium. Department of Animal Sciences and Industry. Review of Reproductive Physiology. Jeffrey S. Stevenson, Ph.D. State of Kansas. #1 in wheat #1 cattle slaughtered #1 in sorghum grain (milo) #1 in sorghum silage produced - PowerPoint PPT Presentation
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Review of Reproductive Review of Reproductive PhysiologyPhysiology
Jeffrey S. Stevenson, Ph.D.Jeffrey S. Stevenson, Ph.D.
Ontario Association ofOntario Association ofBovine PractitionersBovine Practitioners
Reproductive SymposiumReproductive Symposium
Department of Animal Sciences
and Industry
20 inches(508 mm) 20-24 inches
(508-640 mm)28-32 inches(711-813 mm)
32-36 inches(813-914
mm)36-40 inches
(914-1016 mm)
>40 inches(>1016 mm)
24-28 inches(640-711 mm)
Annual Precipitation
State of KansasState of Kansas#1 in wheat#1 cattle slaughtered#1 in sorghum grain (milo)#1 in sorghum silage produced#2 in acres of crop land#2 cattle and calves#5 in agricultural exports#10 in milk yield per dairy cow#18 in milk produced
(GnRH)(GnRH)• Secreted by the GnRH-secreting neurons of
the anterior and medial basal hypothalamus• Stimulates release of LH• Stimulates release of FSH• Induces ovulation through LH release• Marketed as gonadorelins: Cystorelin,
Factrel, Fertagyl, and OvaCyst or as GnRH agonist: Buserelin or Receptal
Hypothalamus
Follicle-Follicle-Stimulating Stimulating
Hormone (FSH)Hormone (FSH)
• Secreted by the anterior pituitary gland• Initiates cyclic waves of follicle growth• Recruits pre-antral follicles to develop an
antrum and become antral follicles• Stimulates biosynthesis of estrogen by
granulosa cells from thecal cell derived androgen precursors
Hypothalamus
• Secreted by the anterior pituitary gland• Stimulates antral follicle maturation• Induces ovulation of mature antral or
pre-ovulatory follicles• Stimulates secretion of androgens by
theca cells from cholesterol• Stimulates secretion of progesterone