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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. Castration tool that uses a band around the testicles which cuts off circulation and eventually the testicles fall off






2. Luteolysis happens because of the ____________ hormone






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






4. (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






5. Knife-loose ~1wk of growth. band-loose ~2wks of growth.






6. Milk is 15% ________ and 85% __________.






7. 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)






8. 26 hours after estrus begins






9. Failure to have both testis (gonads) descend






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






11. Provide nourishment for the developing sperm






12. 30-38 hours after estrus cycle begins






13. Not being bred back into herd. horses are seasonal breeders vs. cows as anytime breeders






14. ~60 days before calving






15. 30-38 hours after estrus cycle begins






16. Animal which has been castrated after puberty






17. (male) Primary sex organ - produces sperm (male gamete) and male sex hormones - 2 total






18. 24 hours before end of estrus cycle






19. 336 days






20. Implies the amount of estrogen production






21. 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.






22. 26 hours after estrus begins






23. Superior genes are _______ to multiply






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






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






26. 2 month growth cycle. stored in the epididymis of the bull






27. 114 days






28. (LH) causes female's egg to break (her period)






29. Scar tissue plugs up chambers of udder






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






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






32. FEED






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






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






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






36. 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






37. 14-19 (17) days






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






39. 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.






40. Why Dairy calves are fed powdered milk.






41. 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.

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






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






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






45. Why does estrus happen before ovulation?






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






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






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






49. 10-37 (21) days






50. 336 days