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






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






3. 30 hours after estrus begins






4. Duct through penis that carries sperm and urine






5. Produce testosterone. located between the seminiferous tubules






6. Milk made by mother which includes antibodies for the calf. MUST be given to the calf within the first 24 hrs of life. also provides calf with energy stores. effectiveness lasts from 4-8 months of age.






7. 2 month growth cycle. stored in the epididymis of the bull






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






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






10. 16-20 hours






11. 45-60 days after breeding; re-breed as required






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






13. Not under a timeline - cow can not be sold as steak






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






15. Duct through penis that carries sperm and urine






16. (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






17. 19-23 (21) days






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






19. Parturition is controlled by...






20. 26 hours after estrus begins






21. Implies the amount of estrogen production






22. 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)






23. FEED






24. Why does estrus happen before ovulation?






25. 10-37 (21) days






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






27. 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)






28. Luteolysis happens because of the ____________ hormone






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






30. 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.






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






32. Animal which has been castrated after puberty






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






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






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






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






37. 30 hours after estrus begins






38. Male on one pin and female on other side






39. Important 'landmark' during palpation






40. Earlier you castrate a male - the easier it is on the animal. the longer you wait - death rates increase






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






42. 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






43. What helps regulate spermatogenesis?






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






45. Sperm is produced here






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






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






48. (switzerland) 2nd in size and milk production - most muscle -






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






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