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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. (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






2. ~60 days before calving






3. Front feet and head first. (except for hogs and dogs)






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






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






6. 45-60 days after breeding; re-breed as required






7. The more stressed out the male is - the less sperm he is going to produce






8. FEED






9. 147 days






10. Important 'landmark' during palpation






11. Microscopic - make sure not sterile - very few bulls are actually tested






12. When she is pregnant in her last trimester because she needs the energy to carry around and deliver the calf. and when the calf is born because the cow needs the fat to be deposit it into her milk for the calf's energy stores.






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






14. 336 days






15. 1. sperm is not implanted in egg until hours after breeding. 2. fetal growth has not yet finished.






16. 16-20 hours






17. Implies the amount of estrogen production






18. BST given to dairy cattle makes the mammary gland more persistent - helps produce more milk. good as Long-term because it does not cause cow to bulk up - provides more milk/cow Which means less cows needed - less cows need to be given feed - lower co






19. 336 days






20. 24 hours before end of estrus cycle






21. Animals which have many estrous periods per year (ex: cow - sow)






22. 1-2 days






23. Largest dairy cow - largest udder - highly vascular - eat 40-50% dry matter (eat alot) - most total butterfat






24. Allows extension of penis without fibro-elastic penis






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






26. 14-19 (17) days






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






28. Parturition is controlled by...






29. Cycle that lasts weeks (ovulation->hormone cycles->ovulation)






30. 4-6 days






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






32. Failure to have one testis (gonad) to descend






33. 45-60 days after breeding; re-breed as required






34. Pulls sperm and egg together - gets body ready for pregnany - stimulates growth cells - develops mammary glands - starts to deposit fat.






35. 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.






36. 114 days






37. FEED






38. 147 days






39. 1. seminiferous tubules - 2. sertoli cells - 3. leydid or interstitial cells






40. Actual heat cycle (period)






41. Superior genes are _______ to multiply






42. 283 days






43. Serves as a bone cradle for the reproductive system. used greatly in palpation as a 'landmark'.






44. Contains and regulates the temp of the testes for sperm production






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






46. What makes the milk flow through the mammary glands?






47. 283 days






48. Duct through penis that carries sperm and urine






49. Why Dairy calves are fed powdered milk.






50. 1-3 days