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Dairy Cattle And Reproduction

Subjects : industries, dairy
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. (LH) stimulates the Leydig cells to produce testosterone






2. Failure to have both testis (gonads) descend






3. (male) definition: duct located outside of the testes. 3 parts: head - body - tail. 4 Functions:concentrate sperm - store sperm - transport sperm - site of sperm maturation. entire process takes ~40-60 days






4. Prevent the cow from getting an infection from the calve






5. Failure to have both testis (gonads) descend






6. 24 hours before end of estrus cycle






7. 26 hours after estrus begins






8. Supply nutrients for the sperm following ejaculation and deposition into the female reproductive tract






9. Supply nutrients for the sperm following ejaculation and deposition into the female reproductive tract






10. When are steers and heifers weaned from bottle feeding?






11. Scar tissue plugs up chambers of udder






12. (from Jersey Islands in Great Britain) Smallest cow - least milk - highest butterfat %






13. 1. to eliminate breeding the females at an early age - 2. makes animals less lean and provides a better cut for the market






14. 19-23 (21) days






15. Days which have decreasing daylight hours


16. Reproduction. more offspring leads to more feed costs - but is offset by reproduction numbers






17. What about the sperm for a bull which has been castrated but still has testicles?






18. Milk ~305 days - dry 60 days prior to calving






19. % of fat in milk. makes cheeses and ice cream. regulates cost of milk






20. 1. need to be restricted in amt of grain - 2. no more than 70% of ration can be concentrates. 3. *Acidic acid has to be produced in order for milk synthesis to occur (30% forages)






21. S-shaped inside body - relaxes to be exposed for breeding. Disadvantges: muscles weaken with age - cannot always hold it in - exposed to harsh outside conditions or stepped on.


22. Luteolysis happens because of the ____________ hormone






23. Completes uterine growth initiated by estrogen and prepares the uterus for nourishment of developing embryo if pregnancy occurs - supports pregnancy by maintaining quiescent state of reproductive tract and suppresses mating behavior - prevents ovulat






24. Animals which have many estrous periods during certain periods per year (ex: mare - ewe)






25. 1. bring in new genes - 2. replace males with leg problems (difficulty breeding) Note: culling has a much greater emphasis in the dairy industry vs the beef industry.






26. Castration tool which clamps down on the vans deferens. causes the sperm to not reach the penis to be ejaculated






27. When are dairy cattle dehorned?






28. ~305 days (altough often longer due to breeding difficulties)






29. Sperm production






30. (FSH) helps to regulate puberty - needed every day - stimulates the sertoli cells to produce nutrients for the sperm






31. To remove/separate testicles from animal's body before animal reaches puberty






32. Animal which has been castrated after puberty






33. 2 month growth cycle. stored in the epididymis of the bull






34. 4-6 days






35. Larger the cow - more milk is produced; smaller the cow - less milk is produced






36. 283 days






37. 1. visual evaluation - 2. scrotal circumference - 3. penis and prepuce observation - 4. rectal palpation - 5. libido test - 6. semen evaluation






38. Hold the penis in the bulls body when not in use. releases penis before ejaculation or urination.






39. Located directly in front of the cervix. fertilized egg implants here. connected to two uterine horns. implantation occurs on the same side as ovulation occurred.






40. Indicator of sperm production. the bigger the scrotal circumference the bigger volume of sperm because more seminal vesicles available to produce the sperm






41. Animals which have only one estrous cycle (ex: dog - fox)






42. Can produce 200 calves naturally (~100 bulls) - top 1-2% will grade like him. everything left to chance if no AI performed






43. Constitute 50-90% of the volume of the ejaculate. (3 glands total: seminal vesicles - prostate gland - cowper's gland)






44. Examine accessory glands - also to know how big the pelvic opening is->heritable->relates to how much dystocia that bull's daughter has






45. Cleans and lubricates the urethra ahead of the sperm. (if not - the urine in the urethra has a high salt content and would cause sperm to rupture and die)






46. Can survive ~7 days in cow. vast majority <48 hours






47. Birthing process (termination of gestation)






48. Head - neck - mid-piece - tail. genetic material - has an enzyme covering that allows it to penetrate the egg






49. 1. brain function - 2. blood flow - 3. willing female






50. Organ of copulation - provides passageway for semen and urine - muscular organ characterized especially by its spongy - erectile tissue that fills with blood