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Reproduction and neonatology

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26 Questions

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

Mare

Which of the following is polyestrous throughout the year

Cow

Which of the following is polyestrous throughout the year

Sow

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

Both A and B

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

All of the above

Which species has an estrous cycle duration average of 16 days

Sheep

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

Cattle

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

Pig

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

Sheep

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

Horse

The average length of estrus for this species is 15h

Cattle

The average length of estrus for this species is 50h

Pig

The average length of estrus for this species is 30h

Sheep

The average length of estrus for this species is 7d

Horse

The typical length of estrus for this species is

Cattle = 6-24h Pig = 12-96h Sheep = 18-48h Horse = 2-12d

The average time of ovulation for this species is

Cattle = 24-32h Pig = 36-44h Sheep = 24-30h Horse = 5d

Female reproductive hormones

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

Uterine contractions/milk letdown is due to which hormone

Oxytocin

Estrus cycles, species variation

Equine = Seasonally polyestrus - spring/summer Bovine and porcine = Polyestrus all year Ovine and caprine = Seasonally polyestrus - fall/winter

  • = -

Estrus cycles - species variation

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

  • = -

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

True

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

False

Veterinary manipulation of the female reproductive cycle

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

Veterinary manipulation of the female estrus cycle

Oxytocin = Induction of labor, must be refrigerated Dexamethasone = Induction of labor

  • = -
  • = -

Transrectal ultrasonography

Early pregnancy diagnosis = 14-15 days Twin reduction = <18 days Fetal sex determination = 65 days = = =

Gestation period

Equine = 340 days Bovine = 280-290 days (some breed variation) Porcine = 112-115 days Ovine/caprine = ~150 days

Test your knowledge on seasonal polyestrous breeders and their reproductive physiology. Identify which animals are 'long day' breeders and exhibit seasonal polyestrous behavior.

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