ANS 313 Exam 6: Livestock Nutrition, Exams of Animal Biology

Download ANS 313 Exam 6: Livestock Nutrition and more Exams Animal Biology in PDF only on Docsity! ANS 313 Exam 6 December 6, 1999 Lab: ___ Name: ______________________ True/False (2 points each) 1. T F A fat steer generally will eat less than a thin steer if body weight, genetics, level of activity, age, and health are equal. 2. T F In general, the sooner food is digested or passed, the sooner the gut is empty, and the sooner an animal can eat again. 3. T F The two big health problems with most livestock are infections of the digestive tract and infections of the nervous system. Hence, we often give medicated feeds as a prophylactic to control these diseases and improve gains. 4. T F Because somatotropin is a steroid hormone, it can be given as a sustained release injection every 14 days. If it were a protein hormone like somatotropin-releasing hormone, it would have to be injected daily. 5. T F One disadvantage of protein hormones, such as insulin, as metabolic modifiers is that they are susceptible to degradation by proteolytic enzymes in the digestive tract. Thus their biological potency is lost if they are fed. Multiple-choice (only one best answer for each; 2 points each) 6. For a dairy cow in early lactation, nutrients would be partitioned in the following order (with most important first): a. maintenance  muscle deposition  mammary gland  adipose deposition b. maintenance  mammary gland  muscle deposition  adipose deposition c. mammary gland  maintenance  muscle deposition  adipose deposition d. mammary gland muscle deposition adipose deposition  maintenance 7. ___ Which of the following is true regarding the regulation of feed intake? a. body temperature rises during eating (due to Heat Increment) and causes satiety. b. blood glucagon rises during eating and causes satiety. c. bST alters the metabolic setpoint so that a lactating cow will eventually eat more. d. high fiber diets increase feed intake in calves because fiber passes out of the rumen quickly. 8. In a pig fed a well-balanced corn-soy diet: a. glucagon will be at high concentrations b. growth hormone concentrations will be high c. gluconeogenesis will be very low d. concentrations of non-esterified fatty acids in blood will be very high 9. ___ Generally, as total food dry matter intake per day increases, the rate of passage increases and a. the rate of digestion increases. b. the percent of food digested increases. c. the total amount of food digested increases. d. none of the above 10. Which of the following is NOT true regarding the use of ionophores in feedlot diets: a. rumensin and bovatec decrease the production of methane in the rumen b. rumensin and bovatec decrease the incidence of bloat c. rumensin and bovatec increase feed intake d. rumensin and bovatec improve feed efficiency Match the metabolic signal with its metabolic effect (use a letter only once; 2 points each) 11. ____ Low rumen pH a. signals satiety in ruminants only 12. ____ Low blood glucose b. signals satiety 13. ____ High blood insulin c. signals hunger in nonruminants only 14. ____ High blood non-esterified fatty acids d. signals hunger e. has no metabolic effect on intake Fill-in-the-blank (3 points each). 15. ___________________ This recently discovered hormone is produced by adipose tissue. Higher concentrations in blood usually will decrease voluntary feed intake. 16. ___________________ The phenomenon of maintaining high flow of glucose, amino acids, and fatty acids to the mammary gland even when nutrient intake is not adequate to meet the animal’s requirements. 17. ___________________ Before a feed additive is approved for use in livestock, this federal agency must be confident that it is generally safe for animals and for humans and that it is efficacious. 18. ___________________ Name one gastrointestinal hormone. 19. ___________________ This word is defined as the overall acceptability of a food. It is a function of flavor, smell, appearance, color, texture, and even sound. 20. ___________________ These animals are often given synthetic analogs of estrogens, androgens, and/or progesterone to increase growth rates and improve feed efficiency. (Name species and lifecycle phase–for example "lactating dairy cow"). 21. ___________________ Along with having a specific gravity greater than water, this is one of the criteria that will determine if a feed particle will pass out of the rumen and on down the digestive tract. 22. ___________________ Name the major glucose regulatory hormone produced by the pancreas that will be elevated by glucose absorption. 23. ___________________ Name a hormone that will be elevated in response to a long-term fast. 24. Ammonium chloride (NH4Cl) is sometimes fed to dairy cows or sheep. For one of these species, state why it would be fed–what metabolic problem is it supposed to prevent? (10 words or less) Species:____________ Metabolic problem prevented:____________________________ 25. Why would bentonite be added to a feed? (10 words or less) 2 28