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Reproduction in Dogs
From ANS 316 Species 1 Lecture
11
Veterinary Medicine
Undergraduate 3
06/07/2013

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Cards

Term
Monoestrus
Definition
  • Dogs can have 1,2 or 3 estrous cycles per year
  • little, if any, photoperiod influence in domestic dog
  • Anestrus is part of the estrous cycle
Term
Estrus
Definition
  • Prolonged
  • Onset coincides with the LH surge
  • Ovulation occurs within 3-5 days after estrus onset
  • Ovulation of multiple ova is complete within 24 hours
  • Dog ovulates primary oocytes in metaphase 1 shich are fertilizable for up to 7 days
Term
Estrual Behavior
Definition
  • Female will seek male
  • Lordosis
Term
Metestrus
Definition
  • Included as part of estrus becuase the female is still exhibiting sexual receptivity during the early CL formation
Term
Estrous Cycle
Definition
  • Average length is 7-8 months
  • Average anestrus is 125 days
  • Estrus [metestrus 9-10 days]-->diestrus (75 days) --> anestrus (125 days) --> proestrus (9 days) --> estrus
  • Anestrus can range from 15-265 days depending on the breed and individual female
Term
Diestrus
Definition
  • Prolonged & unusual duration (CL activity longer in diestrus than gestation)
  • Synonymous with pseudopregnancy
  • 2 type of pseudopregnancy
Term
Covert Pseudopregnancy
Definition
no external signs, only high serum progesterone levels and endometrial hypertrophy
Term
Overt Pseudopregnancy
Definition
Same as in covert, but mammary gland development and maternal behavior
Term
Anestrus
Definition
  • Period of ovarian inactivity
  • between diestrus and proestrus
Term
Proestrus
Definition
  • Prolonged
  • swelling of the vulva
  • proestrus bleeding (E2 is high and causes an increased vascularity in the endometrium resulting in red blood cell leakage into the uterine lumen and voiding through the vagina)
Term
Progesterone
Definition
  • Secreted prior ovulation
  • LH surge causes follicle cells to luteinize and P4 secretion commences as follicles begin to undergo ovulation
  • Depending on whether the female is pregnant or not, progesterone secretion will either end at 58-63 days (pregnant) or 75 days (not) from the start of estrus
  • DOGS DO NOT RELY ON PGF-2ALPHA!

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