Swine Reproduction: Anatomy of the Reproductive Tract and Estrous Cycle, Slides of Biology

Download Swine Reproduction: Anatomy of the Reproductive Tract and Estrous Cycle and more Slides Biology in PDF only on Docsity! Swine Reproduction Docsity.com What is the point? • Why are we learning about swine reproduction? • We need to breed the gilts in the barn • We will be doing this by artificial insemination • We need to know what we are doing Docsity.com Uterine horns — Bladder Urethra Vagina Oviducts Cervix Docsity.com Ovaries • Primary Structure • Two Major Function: – To produce ova, the female germ cells – To produce the hormones progesterone and estrogen Docsity.com Follicles F * s . Ovaries Docsity.com Uterine Horns • 2 – 3 feet in a non-pregnant sow • Act as a passage way for sperm • Are the site of fetal development • Uterine body is located at junction of the uterine horns Docsity.com Cervix • Muscular junction between the vagina and uteri • Site of semen deposit • It is dilated during heat (estrus) – Constricted during pregnancy and when not in heat Docsity.com Spirette Docsity.com Vulva • External part of the reproductive tract • Becomes red and swollen just prior to estrus Docsity.com Uterine horns — Bladder Urethra Vagina Oviducts Cervix Docsity.com Activity • With a partner, you will put together a model of a gilt’s reproductive tract, just like the picture used during lecture, using play dough. • The supplies will be located at the front of the room. Docsity.com Hypothalamus Pituitary ® Docsity.com Estrus or Heat • Follicles – 6 to 10 will form on each ovary – Growth begins 3 days before estrus • FSH (Follicle Stimulating Hormone) released from the pituitary gland • Maturing ovum is held in each follicle • Estrogen is secreted (responsible for estrus) • Ovulation is stimulated by LH (Luteinizing Hormone) Docsity.com Signs of Estrus • Standing Heat – standing to be mounted or “back pressure test” – Red, swollen vulva – Increased nervous activity – Desire to seek boar – Decrease in appetite – Vaginal mucous Docsity.com Review con’t • Which hormone is responsible for maintaining pregnancy? – Progesterone What are the signs of estrus? • Standing Heat – standing to be mounted or “back pressure test” – Red, swollen vulva – Increased nervous activity – Desire to seek boar – Decrease in appetite – Vaginal mucous Docsity.com Reality!!! • In four days the gilts will be in heat and you all will have a chance to Artificially inseminate one of the gilts. • It is important to understand the reproductive tract and cycles. • Tomorrow we will practice on a model of a gilt Docsity.com