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Dairy Cattle And Reproduction

Subjects : industries, dairy
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. ~305 days (altough often longer due to breeding difficulties)






2. 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






3. Duct through penis that carries sperm and urine






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






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






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






7. Boars and stallions-> deliver semen directly into the cervix. bulls and rams-> deliver semen into the vagina.






8. Start of the reproductive tract for the female. located outside of the body






9. Small tubes located at the upper ends of the uterine horns. connects uterine horn to infundibulum. passageway of the egg.






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






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






12. Check feet and legs - look for masculine traits in build such as crest and muscling






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






14. Look for infection - split - and rupture of the penis






15. Sperm is produced here






16. Start of the reproductive tract for the female. located outside of the body






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






18. Luteolysis happens because of the ____________ hormone






19. 1-3 days






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






22. 265-285 days






23. Failure to have both testis (gonads) descend






24. 283 days






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






26. 45-60 days after breeding; re-breed as required






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






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






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






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






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






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






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






34. When are dairy cattle dehorned?






35. (FSH) causes egg to mature in females






36. Why does estrus happen before ovulation?






37. FEED






38. 24 hours before end of estrus cycle






39. (male) pushes the testes outward toward the legs for a cool-down off of the body






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






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






42. Provide nourishment for the developing sperm






43. (FSH) causes egg to mature in females






44. 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.






45. 336 days






46. Important 'landmark' during palpation






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






48. 30-38 hours after estrus cycle begins






49. (LH) stimulates the Leydig cells to produce testosterone






50. 19-23 (21) days