Animal Reproductive Cycles

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This presentation outlines the estrus cycle of livestock animals. It also outlines common ages of puberty in livestock animals.

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Animal Reproductive Cycles

  1. 1. Estrus and Menstruation
  2. 2. <ul><li>Estrus – Time of ovulation and sexual receptivity in most mammals; known as heat </li></ul><ul><li>Menstruation – the shedding of the thickened lining of the uterus in humans and some primates </li></ul><ul><li>Animals in estrus mate whenever with whomever when in estrus vs. animals with a menstrual cycle choose when and with whom to mate. </li></ul>
  3. 3. <ul><li>Cows 21 days </li></ul><ul><li>Pigs 21 days </li></ul><ul><li>Mares 21 days </li></ul><ul><li>Ewes 16 days </li></ul>
  4. 4. <ul><li>The estrus cycle is the period of days between coming into “heat” </li></ul><ul><li>“ Heat” is the term used to describe estrus or sexual receptivity in livestock </li></ul><ul><li>Estrus is brought on by a drop in progesterone levels and an increase in estrogen levels </li></ul>
  5. 5. <ul><li>Cows 12-24 hrs </li></ul><ul><li>Pigs 24-36 hrs </li></ul><ul><li>Mares 4 days </li></ul><ul><li>Ewes 24 hrs </li></ul>
  6. 6. <ul><li>period following estrus </li></ul><ul><li>when cattle and goats ovulate </li></ul><ul><li>LH is released when the follicle ruptures and stimulates the remaining follicle tissue to form the Corpus Luteum </li></ul><ul><li>Corpus Luteum produces progesterone which maintains pregnancy </li></ul>
  7. 7. <ul><li>period when the system assumes pregnancy </li></ul><ul><li>longest phase of estrus cycle </li></ul>
  8. 8. <ul><li>If pregnancy is not established the CL begins to regress </li></ul><ul><li>Progesterone levels drop </li></ul><ul><li>The body prepares for estrus again </li></ul>
  9. 9. <ul><li>Day 1 – first day of menstruation </li></ul><ul><li>Day 5 – Last day of menstruation </li></ul><ul><li>Day 14 – Ovulation </li></ul><ul><li>** Unpredictability of human body </li></ul>
  10. 12. <ul><li>Time at which animals reach a level of sexual maturity that will sustain reproduction </li></ul><ul><li>Not best time to breed animal, not fully mature </li></ul>
  11. 13. <ul><li>Cows 1-1½ years </li></ul><ul><li>Pigs 5-10 mo </li></ul><ul><li>Horses 1½-2 years </li></ul>
  12. 14. <ul><li>Cows 2-2½ years </li></ul><ul><li>Pigs 1-1½ years </li></ul><ul><li>Horses 2½-3 years </li></ul>

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