Relationship Between Nutrition, Growth, and Puberty in Dairy Heifers
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Questions and Answers

What is the role of leptin in relation to nutritional status?

  • Inhibits GnRH neurons
  • Stimulates Neuropeptide Y neurons (correct)
  • Has no impact on metabolic status
  • Activates glucose sensing neurons

    • How do blood fatty acids relate to GnRH neurons stimulation?

  • Have no effect on GnRH neurons
  • Inhibit the activity of GnRH neurons
  • Indirectly stimulate glucose sensing neurons
  • Directly stimulate GnRH neurons (correct)

    • Which environmental factors influence pubertal onset?

  • Optic and olfactory system (correct)
  • Digestive system
  • Cardiovascular system
  • Endocrine system

    • What does the secretion of leptin by adipocytes indicate?

    <p>High fat levels</p> Signup and view all the answers

    How does blood glucose concentration relate to metabolic status?

    <p>Is an indicator of metabolic status</p> Signup and view all the answers

    What role do blood fatty acids play as an indicator of nutritional status?

    <p>Indirectly stimulate GnRH neurons</p> Signup and view all the answers

    What hormone dominates the secretory phase of the menstrual cycle?

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

    Which phase of the menstrual cycle is characterized by sloughing of the endometrium if pregnancy does not occur?

    <p>Menses phase</p> Signup and view all the answers

    What is the primary difference between the estrous cycle and the menstrual cycle?

    <p>Presence of sexual receptivity</p> Signup and view all the answers

    What hormone dominates the follicular phase of the estrous cycle?

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

    Which factor can cause anestrus in animals?

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

    What is the primary function of Progesterone secreted by the Corpus Luteum?

    <p>Reduce motility/contractions in the myometrium</p> Signup and view all the answers

    How does Progesterone affect the number of GnRH receptors on the Anterior Pituitary?

    <p>Decreases the number of GnRH receptors</p> Signup and view all the answers

    What effect does Progesterone have on GnRH, LH, and FSH secretion?

    <p>Suppresses their secretion</p> Signup and view all the answers

    Which organ does Progesterone primarily target besides the uterus?

    <p>Mammary gland</p> Signup and view all the answers

    What is the key role of Progesterone in the endometrium?

    <p>Provide calming conditions for conceptus attachment</p> Signup and view all the answers

    How does Insufficient luteal function potentially impact reproduction in mammals?

    <p>Contributes to reproductive failure</p> Signup and view all the answers

    What happens when mating does not occur in a queen who is an induced ovulator?

    <p>Ovulation occurs, but CL is not formed</p> Signup and view all the answers

    What causes a marked elevation in progesterone after ovulation in the queen?

    <p>Formation of corpora lutea</p> Signup and view all the answers

    Why does lactational anestrus not occur in cats?

    <p>They exhibit regular estrous cycles during lactation</p> Signup and view all the answers

    What is the primary cause of True anestrus in females?

    <p>Insufficient hormonal stimuli</p> Signup and view all the answers

    What is the role of progesterone upon GnRH secretion?

    <p>It suppresses GnRH secretion</p> Signup and view all the answers

    Which of the following factors can contribute to Anestrus in females?

    <p>Pregnancy, lactation, and stress</p> Signup and view all the answers

    How does PGF2α contribute to luteolysis?

    <p>By inducing death of large luteal cells</p> Signup and view all the answers

    What are the two primary factors that influence the onset of the breeding season?

    <p>Temperature and melatonin production</p> Signup and view all the answers

    What is the outcome of uterectomy in women on ovarian cyclicity?

    <p>Has no influence on ovarian cyclicity</p> Signup and view all the answers

    How does administration of progesterone impact the estrous cycle?

    <p>Suppresses estrus and ovulation</p> Signup and view all the answers

    Which event characterizes luteolysis in women as an intra-ovarian event?

    <p>Loss of large luteal cells during the process</p> Signup and view all the answers

    What is the main impact of PGF2α on blood flow to the corpus luteum?

    <p>Reduces blood flow by causing arteriole contraction</p> Signup and view all the answers

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