ANSC221 Nutrtion Exam 1 (The Sequel)

WOAHHH

Dr. Stephen Babcock proposed an experment in which cows were fed just corn plant or just wheat plant. 1) What were the results of this experiment and 2) what is the historical importance of this experiment (2 major points, according to your instructor). (Extra credit)

Corn-fed cows did well, while wheat-fed cows did poorly and failed to reproduce. Historical importance: 1) first semi-purified diet used with farm animals of economic importance, so people really took note, and this became a very important tool in nutrition. 2) it led to a flurry or research opening the Golden Age of Nutrition with the discovery of the vitamins and minerals.

Explain why Dr. Forsyth's research indicates not to oversupplement baby pigs with iron. What could result from doing that? (Extra credit)

Microbes need iron to grow also, and too much iron can lead to increased microbial growth and increased susceptibility to infection.

Which of the following is a toxic mineral not presently known as essential

Hg (mercury)

What is the most important thing your instructor intends to teach you about feed additives?

The most important thing to know about feed additives is that they are REGULATED and it is important to FOLLOW THE REGULATIONS.

BST improves milk production, but why isn't it effective to feed BST to improve milk production?

BST is a protein and if eaten it would be digested into amino acids. It IS approved by FDA for increasing milk production. It must be injected.

Why would you feed a low calcium diet to help prevent milk fever?

Low Ca ahead of calving will stimulate PTH secretion, which is a slow acting hormone that will increase Ca absorption and release of Ca from bone, raising blood Ca. If you wait until calving, the response time of the hormone is too slow to help. If you feed high Ca ahead of time it send the wrong signal, that more Ca isn't needed, and then when it is there isn't time to adapt.

What happens to the extra protein if we eat more than is required?

The nitrogen is excreted and the rest of the molecule is used for energy

List 4 nutrition deficiencies (besides Vitamin K) that result in anemia as a major symptom, in farm animals:

The 6 major nutrient deficiencies resulting in anemia are B6, B12, Folic Acid, Fe, Cu, Co.

List the 3 Essential Fatty Acids

linoleic, linolenic, arachidonic

List the two predominant long chain saturated fatty acids in beef fat. (do not include the word 'acid')

palmitic and stearic

Define triglyceride:

1 glycerol and 3 fatty acids

List the 3 VFA's (volatile fatty acids):

acetic, propionic, butyric

What are the first two limiting amino acids in corn for pigs, in order of most limiting to least?

1) lysine, 2) tryptophan

Which essential amino acid contains sulfur?

methionine

List the 10 essential amino acids (spelled correctly)

phenylalanine, valine, threonine, tryptophan, isoleucine, methionine, histidine, arginine, leucine, and lysine