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2012-02-02 Breeding Management

2012-02-02 Breeding Management - Breeding Management and...

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Breeding Management and Assisted Reproduction IOWA STATE UNIVERSITY COLLEGE OF AGRICULTURE AND LIFE Dr. N. Matthew Ellinwood, D.V.M., Ph.D. February 2, 2012
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Breeding Management How soon, i.e. what age How often Breeding techniques
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Introduction
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Bitch Review First Cycle 6 to 18 months of age Proestrus Vaginal discharge to standing heat Estrus Standing heat to refusal Diestrus Refusal of breeding to whelping Anestrus Whelping to onset of next cycle
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Endocrinology of the Cycle Review Proestrus Estrogen, produced by follicles Growth and bleeding in the uterus Cellular thickening of vaginal canal Estrus Estrogen is decreasing, while progesterone is increasing Standing heat, 48 hours post LH peak (ovulation) ~95% superficial cells Diestrus Pregnancy/pseudopregnancy, progesterone dominant hormone Behavior: the bitch refuses to stand for breeding Cytology: decline in % of superficial cells on vaginal cytology Most reliable non-hormonal milestone of cycle
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Other clues to onset of estrus Not 100 % reliable Vulva may become less swollen and/or turgid Bloody vaginal discharge may change to a straw colored discharge While these can help, the most reliable method will remain monitoring vaginal cytology and behavior changes in the bitch and the male
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Overview of the cycle http://arbl.cvmbs.colostate.edu/hbooks/pathphys/reprod/vc/
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First Breedings > 2 years of age for stud and bitch Hip certification and other health screenings Bitch No more often than every other cycle Every two years recommended Stud Avoid overuse Population Progeny evaluation
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Primary cause of “infertility” Most bitches who fail to conceive have normal fertility Most males who fail to settle a bitch with pups have normal fertility The single greatest cause of infertility is failure to breed at the right time
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Tools and concepts necessary for successful breedings The average bitch does not exist Trusting to “chemistry” . . . How to assess normal courting and mating behavior Vaginal cytology . . . The tried and true method in simple breeding management The power of the pen . . . Keeping records for the lifetime of your bitch
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