1 / 24

The Effect of Hormones on the Estrous Cycle

The Effect of Hormones on the Estrous Cycle. Hypothalmus - primitive part of the brain that controls other endocrine glands. Stimulates the pituitary Pituitary Gland –at the base of the brain. Regulates hormone secretion throughout the body.

hyman
Télécharger la présentation

The Effect of Hormones on the Estrous Cycle

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Effect of Hormones on the Estrous Cycle • Hypothalmus- primitive part of the brain that controls other endocrine glands. Stimulates the pituitary • Pituitary Gland –at the base of the brain. Regulates hormone secretion throughout the body. • FSH – Follicle Stimulating Hormone. Causes the follicle to mature. • Lutenizing Hormone – causes ovulation and the formation of the corpus luteum.

  2. Hormones • Estrogen- • Prepares the cow for sexual activity. “Heat” • Progesterone, • secreted by the corpora lutea, • Stops the development of follicles • Stops estrogen. • Stops cow from coming into heat. • prepares the uterus to receive the fertilized egg maintains pregnancy. • Follicle stimulating hormone (FSH) and luteninizing hormone (LH) are secreted & travel through the blood to the ovary. • FSH and LH are mediated by gonadotropic releasing hormone (GnRH) coming from the hypothalamus to signal their release from the pituitary. • FSH stimulates the growth, development and function of the follicle, while LH cause the follicle to rupture during ovulation and causes the subsequent development of the corpus luteum. http://www.mothercow.org/bull/barnyard/hormones.jpg

  3. Two organs of reproduction are located in the head hypothalamus controls: Body temperature, and the drive to eat and drink are just a few functions. It sends and receives neural signals through the nervous system and hormonal messages through the endocrine system. pituitary gland, at the base of the brain. The pituitary is divided into two regions: the anterior and posterior pituitaries.

  4. We are going to look into the function of the hypothalamus and the pituitary gland.

  5. Follicle produced by FSH

  6. This follicle will soon rupture(ovulation) with the help of LH

  7. CL (Corpus Luteum) takes the place of the follicle. The CL produces the hormone progesterone.

  8. Estrous • Heat is the time when a female is receptive to the male and will allow breeding to take place • Heat is actually divided into 4 phases of the cycle.

  9. Phases of Estrous • Proestrus: ovary is about to release an egg • Estrus: female receptivity • Metestrus: uterus prepares for pregnancy • fertilized egg attaches to uterus • Diestrus: longest period of cycle • inactive • Estrous Cycles stop after conception, and begin soon after Parturition (birth)

  10. Hormones Estrogen – produced by the ovary • causes secondary sexual characteristics to develop • Causes symptoms of heat Progesterone – produced by the corpus luteum and the uterus in later stages of pregnancy Maintains pregnancy Used to synchronize estrous Progesterone and estrogen are mutually exclusive

  11. Hormones • Oxytocin – causes milk letdown and induces labor • Prolactin - lactation • Adrenaline ( epinephrine) • Secreted by the adrenal glands • Causes a “flight or fight” syndrome • Neutralizes oxytocin

  12. have . This cycle of egg development in cattle is called the estrous cycle.The cow is a non seasonal polyestrous species. Which means a cow can multiple estrous cycles throughout the year.   Two prominent structures are present within the ovary, the follicle and corpora lutea. have

  13. Estrous Cycle • The ovarian changes during a typical 21-deay estrous cycle in which pregnancy does not occur. • The development and regression of the corpus luteum and of the follicles are continuous processes http://www.cahe.nmsu.edu/pubs/_b/b-212.pdf

  14. The Estrous Cycle

  15. Methods of Heat Detection • Visual Appraisal • Gomer Bulls • Electronic device • Ultrasound machine • Marking harness (sheep and goats) • Teaser Stallion

  16. Standing Heat is the best indicator Restlessness Discharge from vulva Swollen vulva Mares will raise tail, and “winking” Symptoms of Estrous

  17. Red, swollen vulva Ears raised with back pressure Stand for back pressure Heat symptoms in sows

  18. Monitors electrical conductivity changes in vaginal mucous Heat Detection Device

  19. Gomer Bulls Have had penis diverted to the side May have had vasectomies

  20. Teaser Stallions • May be lower quality • Are kept near mares to encourage her to “show” heat symptoms

  21. Ink or chalk filled pad Color changed between cycles Marking Harness on Rams

  22. Solar Powered Networked Heat detectors • Electronic device on female, reads pressure and sends signal to headquarters

More Related