Reproduction and neonatology
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Questions and Answers

Which of the following is seasonally polyestrous, "long day" breeders

  • Cow
  • Ewe
  • Mare (correct)
  • Both A and C

    • Which of the following is polyestrous throughout the year

  • Cow (correct)
  • Mare
  • Ewe
  • Both B and C

    • Which of the following is polyestrous throughout the year

  • Doe
  • Sow (correct)
  • Ewe
  • Both B and C

    • Which of the following is seasonally polyestrous, "short day" breeders

    <p>Both A and B</p> Signup and view all the answers

    Which species has an average estrous cycle duration average of 21 days

    <p>All of the above</p> Signup and view all the answers

    Which species has an estrous cycle duration average of 16 days

    <p>Sheep</p> Signup and view all the answers

    The typical range of estrous cycle for this species is 14-28 days

    <p>Cattle</p> Signup and view all the answers

    The typical range of estrous cycle for this species is 16-26 days

    <p>Pig</p> Signup and view all the answers

    The typical range of estrous cycle for this species is 13-19 days

    <p>Sheep</p> Signup and view all the answers

    The typical range of estrous cycle for this species is 15-26 days

    <p>Horse</p> Signup and view all the answers

    The average length of estrus for this species is 15h

    <p>Cattle</p> Signup and view all the answers

    The average length of estrus for this species is 50h

    <p>Pig</p> Signup and view all the answers

    The average length of estrus for this species is 30h

    <p>Sheep</p> Signup and view all the answers

    The average length of estrus for this species is 7d

    <p>Horse</p> Signup and view all the answers

    The typical length of estrus for this species is

    <p>Cattle = 6-24h Pig = 12-96h Sheep = 18-48h Horse = 2-12d</p> Signup and view all the answers

    The average time of ovulation for this species is

    <p>Cattle = 24-32h Pig = 36-44h Sheep = 24-30h Horse = 5d</p> Signup and view all the answers

    Female reproductive hormones

    <p>Follicle Stimulating Hormone (FSH) = Follicle development/maturation Luteinizing Hormone (LH) = Ovulation Estrogen = Behavioral signs of estrus, psychic heat - attracting male, accepting male Progesterone = Prevents ovulation/maintains pregnancy</p> Signup and view all the answers

    Uterine contractions/milk letdown is due to which hormone

    <p>Oxytocin</p> Signup and view all the answers

    Estrus cycles, species variation

    <p>Equine = Seasonally polyestrus - spring/summer Bovine and porcine = Polyestrus all year Ovine and caprine = Seasonally polyestrus - fall/winter</p> <ul> <li>= -</li> </ul> Signup and view all the answers

    Estrus cycles - species variation

    <p>Equine = Ovarian activity increases with increased daylength and can be induced/manipulated using artificial lighting Beef cattle = Concentrated breeding season/spring calving - minimizes labor costs Dairy cattle = year round breeding and calving</p> <ul> <li>= -</li> </ul> Signup and view all the answers

    Vaginal discharge (blood-tinged or otherwise) is not associated with estrus in any of the species discussed

    <p>True</p> Signup and view all the answers

    Vaginal discharge (blood-tinged or otherwise) is associated with estrus in all of the species discussed

    <p>False</p> Signup and view all the answers

    Veterinary manipulation of the female reproductive cycle

    <p>Prostaglandin F2Alpha (PGF2A) = Lyses Corpus luteum bringing animal into estrus Progesterone (regumate) synthetic progesterone = Suppresses ovaries, prevents estrus, aids in pregnancy maintenance Human Chorionic Gonadotropin (HCG) = comparable to LH, used to induce ovulation for scheduled breedings Oxytocin = induction of labor, must be refrigerated</p> Signup and view all the answers

    Veterinary manipulation of the female estrus cycle

    <p>Oxytocin = Induction of labor, must be refrigerated Dexamethasone = Induction of labor</p> <ul> <li>= -</li> <li>= -</li> </ul> Signup and view all the answers

    Transrectal ultrasonography

    <p>Early pregnancy diagnosis = 14-15 days Twin reduction = &lt;18 days Fetal sex determination = 65 days = = =</p> Signup and view all the answers

    Gestation period

    <p>Equine = 340 days Bovine = 280-290 days (some breed variation) Porcine = 112-115 days Ovine/caprine = ~150 days</p> Signup and view all the answers

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