Exam Questions on Livestock Feeding and Nutrition, Exams of Animal Biology

Download Exam Questions on Livestock Feeding and Nutrition and more Exams Animal Biology in PDF only on Docsity! ANS 313 EXAM 4 November 4, 1999 Lab: Name: Due November 11, 1999 True/false (1 points each) 1. T F When purchasing commodity feeds, don’t worry about what the feed looks like if you have a report from a feed lab showing its nutrient analysis. 2. T F The most important rule in mixing feeds is to make sure that it does not waste too much of your time. 3. T F Growing heifers should be fed very high energy diets to ensure that they can be bred on time to calve at 20-24 months of age. 4. T F Knowing the dry matter percent of forages is not very important when mixing up a total mixed ration for dairy cattle as long as accurate NDF and CP values are used in the ration. 5. T F The efficiency of feed deposition decreases with age, while the daily body weight gain increases. 6. T F Beef steers at 600 lb should be fed a special source of by-pass protein. 7. T F Lactating sows require 13% CP diet. 8. T F The protein to energy ratio in a swine diet should increase with age. 9. T F When you feed a dairy cow a diet that is high in NDF and low in NEL the first limitation to high energy intake is rumen fill. However, when you feed a diet that is low in NDF and high in NEL other problems such as rumen acidosis can be expected. 10. T F When temperatures exceed 80F, the feed intake of a growing steer will usually decrease. Multiple choice (1 point each, choose only one best answer per question) 11. ____ Lean genetic lines of pigs: a. require more AA daily to maximize their genetic potential b. are more efficient in converting feed to gain c. might not be any more efficient in converting feed energy to tissue energy d. all of the above 12. ____ Which of the following is true regarding the requirement for protein relative to the requirement for energy (the protein to energy ratio in the diet) of horses: a. It decreases as the animal gets older. b. It is greater for pregnant mares than for lactating mares. c. It is greater for exercising horses than for maintenance horses. d. None of the above are true. 13. ____ You can purchase any of the following hays. Which would be most appropriate for a group of young growing horses? a. Alfalfa hay 60% TDN 18% CP $100 / ton b. Mixed alfalfa/grass hay 65% TDN 16% CP $70 / ton c. Mixed alfalfa/grass hay 52% TDN 13% CP $60 / ton d. Alfalfa hay, no nutrient analysis available and the bales are moldy, $60 / ton 14. ____ A good livestock feedlot manager is one who: a. spends most of the time in an office analyzing records and balancing diets b. pays close attention to the animals and their response to management changes c. constantly yells at employees and family members to improve their work efficiency d. spends most of the time actually working, not wasting time on "management" 15. ____ For a growing steer, increasing the TDN of a diet from 60% to 80% would be expected to: a. Increase DM intake and increase energy intake b. Increase DM intake but decrease energy intake c. Decrease DM intake and decrease energy intake d. Decrease DM intake but increase energy intake 16. ____ In which stage of her life cycle does a beef cow require the greatest energy density in her diet? 15 a. Prepuberty b. Postpuberty c. Gestation d. Early lactation 17. ____ As a general rule, to maximize profit in a beef feedlot operation: a. focus on keeping feed costs as low as possible b. focus on maximizing daily gain c. focus on enhancing long-term health d. all of the above e. none of the above 18. ____ Regarding effects of environment on the ratio of protein to energy in a swine or poulty diet: a. during hot weather, the protein to energy ratio should be increased b.during cold weather, the protein to energy ratio should be increased c.during rainy weather, the protein to energy ratio should be increased d.all of the above e. none of the above Fill-in-the-blank. (2 points each. Spell correctly!) 19. __________________ A laying hen is switched from a diet containing 3000 kcal/kg to a new diet containing 3300 kcal/kg. If the diet originally was correctly formulated and contained 0.30% methionine, the new diet should be what % methionine. 20. __________________ Name the metabolic disorder that results from a deficiency of magnesium when cattle are grazing lush grass pasture in early spring. 21. __________________ The first limiting AA in most corn/soy diets fed to growing swine. 22. __________________ This is the single biggest concern that a swine farmer should have if he is purchasing a lot of raw ingredients and mixing diets on a farm rather than purchasing a complete commercial feed. With complete feeding programs, the feed manufacturer takes care of this. 23. __________________ The common name for the smallest amount of any feed that one could expect to be mixed uniformly into a feed in a reasonable length of time. It is different for different types of mixers. 24. __________________ This feedstuff is often fed to sows around parturition because it acts as a laxative. 25. __________________ This problem is likely to occur in baby pigs if they are not given an iron supplement within the first week of life. 26. __________________ The richest natural xanthophyll source, which when fed to laying hens at 34 mg/lb of feed produces orange yolks. 27. __________________ This form of phosphorus is found in plant seeds and is not very available to swine. 28. __________________ Birds are especially sensitive to these toxic compounds, which are frequently found in grains stored during warm and moist conditions. 29. __________________ This type of grazing system will help match grazing activity with vegetative growth, increase animal production per acre, and help keep weeds down. 30. __________________ This livestock species is especially sensitive to copper. Thus, special trace mineral salts that do contain copper should be used to feed it. 31. __________________ This foot problem is associated with feeding too much grain to a cow or a horse. 32. __________________ Production of this enzyme decreases as amylase & maltase increases in the nursery pig's gut. These enzyme changes are why we feed less milk products as pigs grow. 33. __________________ An extra 5 kg milk/day at peak lactation for a dairy cow is associated with how many kg more milk per lactation? 34. __________________ In times of negative energy balance, an animal draws on body stores, particularly from this tissue. 35. __________________ A good alternative feed ingredient for gestating swine when corn prices are high. 37