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Reproductive Physiology of Beef and Cattle

Reproductive Physiology of Beef and Cattle

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Reproductive Physiology of Beef and Cattle

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  1. Reproductive Physiology of Beef and Cattle Suporn Katawatin Department of Animal Science Khon Kaen University

  2. Reproduction is one of the most important consideration determining the profit of cattle production

  3. RECORD NUTRITION ESTROUS DETECTION MANAGEMENT DAYS OPEN (85 days) HERD HEALTH FEMALE FERTILITY REDUCE AGE AT 1ST CALVING INCREASE % COWS CYCLING TREAT PROBLEM COWS CONTROL GENITAL DISEASE PREGNANCY DIAGNOSIS ARTIFICIAL INSEMINATION IMPROVE AI TECHNIQUE USE GOOD QUALITY SEMEN BREED COWS IN STANDING HEAT

  4. Good reproduction is … to show regular cyclic breeding activity

  5. Reproductive Physiology • Male and Female Reproductive Anatomy • Puberty : age or body weight • Sexual maturity • Estrous Cycle • Mating or Breeding • Calving • Lactation • Recycling

  6. Female Reproductive Characteristics of Cattle and Buffalo

  7. Female Reproductive Characteristics of Cattle and Buffalo

  8. Female Reproductive Characteristics of Cattle and Buffalo

  9. Areas of controlled reproduction in female cattle Control estrus Suppression of estrus Breeding cattle at younger ages Controlled reproduction in cattle Pregnancy testing Induction of twin births Control calving Embryo transfer & in vitro fertilization Control postpartum interval

  10. Heat Detectionor Estrous Detection • Estrous behavior

  11. Before heat(6-10h) Smells other cows Attempts to ride other cows Vulva moist, red slightly swollen

  12. Standing heat (18 h) Stand to be ridden Bawls frequently Nervous & excitable Off feed and milk Vulva moist and red Clear mucous discharge Eye pupil dilated

  13. After heat (10 h) Will not stand Clear mucous discharge from vulva

  14. Hours from the start of estrus Hours 0 6 9 18 24 28 Egg released After heat (10 h) Standing heat (18 h) Life of egg (6-10 h) Before heat (6-10 h) Estrus in cow and associated featured

  15. Approaches to estrus detection in the cow Tail-painting & use of chalk Heat-mount detectors Use of closed circuit television Techniques used in estrous detection Chin-ball devices Cow activity changes Use of teaser animals Progesterone tests Vaginal probes

  16. Hormonal Pattern During Estrous Cycle in Cow

  17. Hormones Used for Induction of Estrus and Ovulation

  18. Hormones Used for Induction of Estrus and Ovulation

  19. Hormones Used for Induction of Estrus and Ovulation

  20. Hormones Used for Induction of Estrus and Ovulation

  21. Protocols for Inducing Estrus and Ovulation in Acyclic Cattle and Buffalo

  22. Techniques for Synchronizing Estrus in Cyclic Cattle

  23. Techniques for Synchronizing Estrus in Cyclic Cattle.

  24. OVSync Breed (cows) GnRH (100ug) GnRH (100ug) PGF2 (35mg) 7 days 48 h 24 h Ovulate follicle Start new follicle wave Ovulate follicle Regress corpora lutea Timing and purpose of hormones to synchronize ovulation in lactating dairy cow (Pursley et al., 1995)

  25. Measure Reproductive Efficiency

  26. Measure Reproductive Efficiency

  27. Book Suggestion • Hafez, E.S.E. and B. Hafez. 2000. Reproduction in Farm Animals. 7th ed. Lippincott Williams & Wilkins, New York. • Gordon, I. 1996. Controlled Reproduction in Cattle & Buffaloes. CAB International. • Bearden, H.J. and J.W. Fuquay. 1997. Applied Animal Reproduction 4th ed. Prentice Hall.