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






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






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






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






6. Provide nourishment for the developing sperm






7. 1-3 days






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






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






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






11. Duct which connects epididymis to urethra of the penis. transports sperm at ejaculation. cut to sterilize male.






12. Days which have decreasing daylight hours

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13. Sperm is produced here






14. 1-3 days






15. 2 month growth cycle. stored in the epididymis of the bull






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






17. Way to know everything is alright with the breeding male






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






19. 336 days






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






21. Luteolysis happens because of the ____________ hormone






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






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






24. Days which have decreasing daylight hours

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25. Scar tissue plugs up chambers of udder






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






27. 19-23 (21) days






28. 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






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






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






31. Depository for semen during insemination. where urine leaves the body






32. 265-285 days






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






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






35. 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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36. 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.






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






38. So when offspring are born - there is more food to be found for energy stores and fat deposits IN THE SPRING






39. Depository for semen during insemination. where urine leaves the body






40. ~60 days before calving






41. 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






42. Why Dairy calves are fed powdered milk.






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






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






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






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






47. 30-38 hours after estrus cycle begins






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






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






50. 24 hours before end of estrus cycle







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