25 Questions on Applied Reproduction - Exam 3 | ANSI 3443, Exams of Animal Biology

Download 25 Questions on Applied Reproduction - Exam 3 | ANSI 3443 and more Exams Animal Biology in PDF only on Docsity! 1 ANSI 3443 Exam 3 Wednesday, April 12, 2006 Name____________________________________ Questions 1 thru 15 are worth 2 points each. For each of the following multiple choice items, choose the single most appropriate answer. 1. The apical ridge of the sperm: A. Is where sperm attach to the oocyte/vitelline membrane during fertilization. B. Is a structure not found in degenerate sperm. C. Is a fold of the acrosomal region of the sperm’s head. D. Is the base of the tail that helps attach the tail to the head. 2. The Leydig cells: A. Produce testosterone. B. Are the type of cells most easily damaged during heat stress. C. Produce glucocorticoids. D. Nurse the spermatocytes during spermatogenesis. 3. Timed A.I. 80 hours after a second injection of Lutalyse (11 days apart) will result in about what percentage conception rate in postpubertal heifers? A. 15%. B. 50%. C. 70%. D. 85%. 4. Completion of Meiosis II during oogenesis is stimulated by: A. The LH surge/ovulation. B. Pheromones from the bull. C. The increase in estradiol during estrus. D. Union of the oocyte with a sperm. 5. If you breed A.I. based on estrus after an injection of Lutalyse, about what percentage conception rate in cyclic cows would you expect? A. 30%. B. 50%. C. 70%. D. 100%. 2 6. An enzyme responsible for breaking down the follicle wall (e.g., theca) during ovulation is: A. Acrosin. B. Cystorelin. C. Collagenase. D. Zona Lysin. 7. The thermoneutral zone of most adult farm animals is about: A. 0-15°F. B. 20-40°F. C. 30-70°F. D. 80-90°F. 8. The correct order of spermatogenesis is: A. Spermatogonia → primary spermatocyte → secondary spermatocyte. B. Primary spermatocyte → spermatozoa → spermatids. C. Spermatogonia → secondary spermatocyte → primary spermatocyte. D. Spermatogonia → spermatids → secondary spermatocyte. 9. Mitotic divisions of spermatogenesis in bulls: A. Are inhibited during chronic heat stress. B. Are completed before birth. C. Take about 20 days to complete. D. Take about 43 days to complete. 10. During proestrus of a cow's estrous cycle: A. Corpus luteum size is at a maximum. B. Progesterone levels in blood are increasing. C. Ovulation occurs. D. Luteal regression occurs. 11. Reproduction Enterprises Inc. often uses which of the following devices to determine sperm numbers in an ejaculate: A. Coulter Counter. B. Spectrophotometer. C. Hemocytometer. D. Laser-directed flow cytometer. 12: Purchase cost per 100 cows per year (spread over 5 years) is greatest for: A. KaMar heat patches. B. HeatWatch system. C. Chin-ball markers. D. Lutalyse. 5 Which statement is true: A. None of the cows of Group B would respond to PGF2α. B. Theoretically, 100% of Group C should respond to PGF2α. C. Both. D. Neither. 25. Glycerol is added to semen extenders to: A. Provide an energy source to sperm. B. Block polyspermy. C. Both. D. Neither. 26. Buffers contained in seminal plasma include: A. Bicarbonate. B. Glucose. C. Both. D. Neither. Questions 27 thru 38 (worth 2 points each): Mark answer space (A) if the statement is true. Mark answer space (B) if the statement is false. 27. An average ejaculate volume for a bull would be about 5-6 mL. A. True B. False 28. “CSS” stamped on some straws of bull semen stands for “Certified Semen Services”. A. True B. False 29. Sperm ejaculated into a cow’s reproductive tract would survive about 2 days. A. True B. False 30. A “dry shipper” used to transport frozen semen does not contain any liquid nitrogen. A. True B. False 31. The number of spermatozoa produced from each primary spermatocyte is equal to the number of fertilizable oocytes produced from each primary oocyte. A. True B. False 6 32. Glucose is an energy source found in the semen extenders. A. True B. False 33. The percentage of cows between day 8 and 14 of the estrous cycle that would respond to PGF2α is greater than the percentage of cows that would become pregnant after timed A.I. 80 hours after a second injection of Prostaglandin F2alpha. A. True B. False 34. Progesterone in blood is usually found at 1000 times higher concentration than estradiol in cattle. A. True B. False 35. One advantage of using artificial insemination is that the danger of keeping a bull on the farm is avoided/eliminated. A. True B. False 36. Decapacitation factors are glycoproteins from the epididymis which coat sperm. A. True B. False 37. The KAMAR device is a computerized radiotransmitter detection patch. A. True B. False 38. A hypertonic extender would cause a sperm head to swell and possibly burst. A. True B. False Questions 39 thru 45 are short answer and are worth 2 to 6 points each. Your answers should be written concisely as possible with correct spelling. 39. Define or describe (2 points each; 6 points total). 1st Polar Body: EAZI Breed CIDR: 7 Luteal Phase: 40. Describe one method of determining the concentration of sperm in the ejaculate (2 points). 41. Describe the difference between Progesterone and Prostaglandin-F2α in terms of how each works to synchronize estrus. (3 points) 42. Describe how you would treat a cow with a LUTEAL cyst. In your answer be sure to state which drug is given first (if more than one is used) and the duration between injections (if more than one). (2 points) 43. Describe two ways to manage or reduce the impact of heat stress in cattle (4 points). 1. 2.