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Understanding Animal Reproduction Cycles: Hormones, Heat Signs & Gestation Periods

Explore the intricate world of animal reproductive systems, from the role of hormones like estrogen and testosterone to the signs of heat and gestation periods in various species. Gain insights into the estrous cycles of swine, cattle, sheep, goats, horses, rabbits, dogs, and cats. Discover the fascinating processes that drive fertility and birthing in these animals.

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Understanding Animal Reproduction Cycles: Hormones, Heat Signs & Gestation Periods

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  1. Reproduction Topic # 3025 Reproductive System Melinda Klockziem

  2. Female Hormones • Estrogen • Produced by follicle and further develops follicle • Progesterone • Produced by CL, sustains pregnancy and inhibits new follicle development

  3. Female Hormones • Prostaglandin • Produced by the uterus and causes CL to regress and new follicle to develop • Relaxin • Produced by the CL and causes ligaments around birth canal to relax • Oxytocin • Produced by the posterior pituitary and causes milk let-down

  4. Male Hormone • Testosterone • Produced by Leydig cell and is critical to normal sperm development

  5. Semen

  6. Swine • Estrous Cycle • 21 day intervals • Signs of Heat • Swollen vulva • Standing heat • Lordosis • Gestation • 114 days average

  7. Cattle • Estrous Cycle • 21 day intervals • Signs of Heat • Standing heat, restless • Gestation • 282 days average

  8. Sheep • Estrous Cycle • 16 days interval • Signs of Heat • Difficult to Detect • Sterile Ram • Chalking device • Gestation • 150 days www.dymark.com.au/packaging&marking/ Rural_Industry.htm

  9. Goats • Estrous Cycle • 21 day intervals • Signs of Heat • Rapid tail wagging • Gestation • 149 days

  10. Horses • Estrous Cycle • 21 day intervals • Signs of Heat • Teasing with Stallion • Squatting • Frequent urination • Winking of vulva • Gestation • 330 days Country Girl Klockziem

  11. Rabbits • Estrous Cycle • Induced ovulation • Signs of Heat • Sometimes aggression • Gestation • 30 days http://www.dutchrabbit.com/graphics/bluec.jpg

  12. Dogs • Estrous Cycle • 4-12 months • Signs of Heat • Standing heat, tail flagging • Gestation • 63 days Winston and Jax Klockziem

  13. Cats • Estrous Cycle • Induced ovulations • Signs of Heat • Vocal, rubbing, rolling, overall annoying behavior • Gestation • 63 days Didi Klockziem

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