2012-01-30 Pregnancy and Cyclicity

2012-01-30 Pregnancy and Cyclicity - Female Reproduction:...

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Female Reproduction: Cyclicity and Pregnancy IOWA STATE UNIVERSITY Dr. N. Matthew Ellinwood, D.V.M., Ph.D. January 30, 2012
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The Bitch and the Queen Historical Aspects - Bitch vs. queen Driving forces of research with dogs and cats Practical aspects Under ideal situations, neither have difficulty becoming pregnant A variety of issues favor greater attention to the bitch for managed reproduction Reproductive physiology Breed characteristics English bulldogs can’t naturally reproduce successfully Management
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Canine and Feline Estrous Cycle Estrus – period of sexual receptivity heat, season, standing Bitch Monestrous Queen Seasonally polyestrous: multiple estrus cycles depending on the season
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Endocrinology of Estrous Cycle Hypothalamic-pituitary-gonadal axis Positive feedback loop Pulsatile secretion of GnRH Pituitary release of FSH and LH Recruitment of ovarian follicles Gonadatrope independent haven’t developed LH and FSH receptors Gonadatrope dependent possessing receptors for LH and FSH
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Estrus Beginning is influenced by estrogen and FSH Escalation of positive feedback loop between ovary hypothalamus and pituitary leads to LH surge Ovulation: 24-48 hours after LH peak Decline of estrogen and rise of progesterone Triggers behavioral estrus in bitch; receptivity
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Trigger for Estrous Cycle Canine Unknown
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2012-01-30 Pregnancy and Cyclicity - Female Reproduction:...

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