Pharmalogical control of reproduction in females
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Questions and Answers

Which of the following is a method used to control reproduction in female animals?

  • Stimulation of the HPO axis (correct)
  • Lengthening of the luteal phase
  • Suppression of the HPO axis
  • Increase in melatonin levels

    • What is the purpose of synchronizing a group of animals?

  • To resolve ovarian pathology
  • To prevent breeding
  • To induce ovulation
  • To hasten return of cyclicty (correct)

    • Which hormone is blocked to prevent breeding in animals?

  • Estrogen
  • Gonadotrophins
  • Melatonin
  • Progesterone (correct)

    • What is the purpose of lengthening or mimicking the luteal phase?

    <p>To cause negative feedback on the HPG axis</p> Signup and view all the answers

    Which hormone is stimulated by a melatonin implant in sheep during the summer months?

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

    What is the purpose of using progestogen sponges in combination with eCG/GnRH in sheep?

    <p>To stimulate early onset of cyclicity</p> Signup and view all the answers

    Which hormone is responsible for resetting the HPG axis in sheep?

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

    What is the purpose of inducing ovulation in animals?

    <p>To stimulate early onset of cyclicity</p> Signup and view all the answers

    Which hormone can be blocked to shorten the luteal phase in animals?

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

    What is the purpose of suppressing the HPO axis in animals?

    <p>To prevent breeding</p> Signup and view all the answers

    Which hormone can be used to hasten ovulation in dogs during AI/mating?

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

    What is a potential risk of using progestogen depots in dogs to suppress oestrus?

    <p>Increased risk of pyometra</p> Signup and view all the answers

    Which hormone can be used to induce ovulation in cats?

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

    What is the purpose of the Ovsynch protocol in resolving anovulatory anoestrus?

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

    What is the recommended treatment for cystic ovarian disease in animals?

    <p>Resolution of pre-disposing factors</p> Signup and view all the answers

    Which vaccine has limited efficacy in carnivores for preventing conception?

    <p>Zona pellucida vaccines</p> Signup and view all the answers

    What is the recommended treatment for pseudopregnancy in dogs and cats?

    <p>Terminate luteal function</p> Signup and view all the answers

    Which hormone can be used to induce luteinisation in follicular cystic ovarian disease?

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

    What is the main cause of persistent CL/prolonged dioestrus?

    <p>Lack of endometrial PGF2A</p> Signup and view all the answers

    What is the potential effect of anti-GnRH vaccines in cattle and horses?

    <p>Reversible suppression</p> Signup and view all the answers

    What is the purpose of synchronizing breeding in animals?

    <p>To make management easier</p> Signup and view all the answers

    Which hormone is commonly used in pigs for breeding synchronization?

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

    Why is it unable to use two doses of PGF in pigs?

    <p>Pigs only respond to PGF after day 11</p> Signup and view all the answers

    Which protocol is commonly used for oestrus detection and management in cattle?

    <p>Ovsynch without P4</p> Signup and view all the answers

    What is the purpose of inserting a PRID or CIDR in cattle breeding synchronization?

    <p>To elevate progesterone levels</p> Signup and view all the answers

    What is the purpose of administering prostaglandin in the Ovsynch protocol for cattle?

    <p>To prevent luteolysis</p> Signup and view all the answers

    What is the purpose of using a progesterone device in the Ovsynch protocol for heifers?

    <p>To maintain high progesterone levels</p> Signup and view all the answers

    What is the purpose of suppressing oestrus in horses?

    <p>To enable training and performance</p> Signup and view all the answers

    What is the common method used to stimulate the onset of cyclicity in horses during the early breeding season?

    <p>Daylight exposure</p> Signup and view all the answers

    What is the purpose of using the Ram effect in pigs?

    <p>To induce oestrus behavior and synchronize breeding for management purposes.</p> Signup and view all the answers

    What are the advantages of synchronizing a group of sows or gilts in pigs?

    <p>Easier management and enables batch farrowing to occur.</p> Signup and view all the answers

    What is the recommended treatment for synchronizing breeding in pigs?

    <p>Progestogen (oral) for 14-18 days with or without eCG just before P4 removal.</p> Signup and view all the answers

    What is the recommended treatment for synchronizing breeding in cattle?

    <p>Multiple different protocols exist, such as Ovsynch (with or without P4), Progestogen plus PGF2a, or fixed-time AI.</p> Signup and view all the answers

    What is the purpose of using a PRID or CIDR in cattle breeding synchronization?

    <p>To elevate progesterone for at least a week before removing the progesterone protocol.</p> Signup and view all the answers

    What is the purpose of using a progesterone device in the Ovsynch protocol for heifers?

    <p>To ensure a high level of progesterone during the 7-day period to enable a rapid fall of progesterone once given prostaglandin.</p> Signup and view all the answers

    What are some methods of pharmacological control of reproduction in females?

    <p>Stimulation of the HPO axis, control of oestrus/ovulation, resolution of ovarian pathology, treatment of pseudopregnancy/termination of pregnancy, parturition and lactation.</p> Signup and view all the answers

    How can we stimulate optimal/controlled mating in animals?

    <p>By synchronizing a group of animals, inducing ovulation, and hastening the return of cyclicity (i.e. after parturition, season, lactation).</p> Signup and view all the answers

    What are some ways to suppress breeding in animals?

    <p>Influencing photoperiod or its control, mimicking release of gonadotrophins for down-regulation purposes, lengthening or mimicking the luteal phase, blocking progesterone, and shortening the luteal phase (with PGF or prolactin inhibitor).</p> Signup and view all the answers

    How can early onset of cyclicity be stimulated in sheep during the early breeding season?

    <p>By using a melatonin implant in summer months and progestogen sponges for approximately 14 days in combination with eCG/GnRH.</p> Signup and view all the answers

    What is the purpose of using a melatonin implant in sheep during the summer months?

    <p>To stimulate the early onset of cyclicity.</p> Signup and view all the answers

    What is the purpose of progestogen sponges in sheep breeding synchronization?

    <p>To ensure the animal has the luteal phase that resets the HPG axis.</p> Signup and view all the answers

    What are the different methods for managing AI/mating in animals?

    <p>Progestogen based protocol, PGF when active CL is present, hasten ovulation with hCG/GnRH</p> Signup and view all the answers

    What are the methods for prevention of oestrus in dogs?

    <p>Progestogen depots for 6+ months, GnRH agonist implant, testosterone in Greyhounds</p> Signup and view all the answers

    What are the methods for induction of oestrus in dogs?

    <p>Prolactin inhibitors for 2-5 weeks, GnRH agonist implant, hCG to induce ovulation</p> Signup and view all the answers

    What are the methods for prevention of oestrus in cats?

    <p>GnRH agonist implant, GnRH antagonists, melatonin implants</p> Signup and view all the answers

    What are the methods for induction of oestrus in cats?

    <p>Exposure to daylight, hCG to induce ovulation, avoid the need for multiple matings</p> Signup and view all the answers

    What are the principles for resolving anovulatory anoestrus in animals?

    <p>Ensure animals are in breeding window, stimulate ovarian follicle wave development, control time of ovulation, ensure induced CL is functionally normal</p> Signup and view all the answers

    What are the treatment principles for cystic ovarian disease in animals?

    <p>Resolution of predisposing factors, diagnosis critical to successful treatment, luteinise if a follicular structure, suppress the hypothalamus-pituitary axis, stimulate luteolysis/regression of luteal tissue</p> Signup and view all the answers

    What are the methods for immunoconception in animals?

    <p>Vaccination against key reproductive proteins, zona pellucida vaccines, anti-GnRH vaccines</p> Signup and view all the answers

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