Lecture quiz 4/19/23 (wednesday)

Question 1

What is a limiting amino acid?

Answer 1

• for a protein to be synthesized, all require amino acids must be present at the time of synthesis.
• if an amino acids is in short supply, it will limit the process - it will be the limiting amino acid

Question 2

What is the definition of a limiting amino acid?

Answer 2

EAA in a feedstuff that is in the lowest amount relative to what the animal requires

Question 3

What is another way of describing a limiting amino acid

Answer 3

-protein barrel and the essential amino acid as the individual staves making up the barrel
-if one stave is short than the other it will be limiting since the barrel can only be filled to the level of the shortest stave
- If one amino acid is deficient, proteins can only be synthesized to the level of availability of that amino acid

Question 4

What is the first limiting amino acid for most animals?

Answer 4

LYSINE

Question 5

In poultry, what is the limiting amino acid?

Answer 5

methionine which contains sulfur = this is beacuse if the connective tissue in feathers

Question 6

What are added into the commercial swine and poultry diets to meet the requirements of limiting amino acids?

Answer 6

supplemental amino acids

Question 7

What is protein quality?

Answer 7

• the nutritional value of proteins in feed ingredients varies
• primarily dependent on the composition of amino acids and the digestibility of the protein

Question 8

T/F animal proteins have a higher quality than plant proteins

Answer 8

T

Question 9

What is the exception?

Answer 9

soy protein most plant based proteins lack one or more EAA

Question 10

What is an example of a good all balanced source of amino acids?

Answer 10

egg whites

Question 11

What do we watch out for in ruminants?

Answer 11

• we only care for protein quantity not quality
• some of the npn in rumenants there is bacteria that makes npn to EAAA

MAKE SURE ONLY GIVE LITTLE NPN IN THE DIET CAUSE ITS DEADLY IF TOO MUCH

Question 12

What are minerals?

Answer 12

• makes uo 3-5% of the body dry weight = depends on what species
  calcium is 50% phosphorus 25% and other minerals 25

Question 13

calcium is responssible for ?

Answer 13

bones and teeth formation, milk and egg shell

Question 14

phosphorus is responssible for?

Answer 14

bone and teeth + others like metabolism, phospholipids and other complex molecules

Question 15

what is the ratio of Ca:P

Answer 15

1:1 to 2:1
young and dairy = 1.5:1 to 2:1
hens = 6:1 cause of egg shells

Question 16

What are the two mineral classificationss?

Answer 16

major and minor

Question 17

What are considered as major mineralss?

Answer 17

greater levels or need in large amounts in diet = Ca,P,Na,Cl,Mg,K,S

Question 18

what are trace minerals?

Answer 18

low levels in animal body = small amounts in the diet
Co,Cu,F,Fe,Mn,Mo,Se,Zn

Question 19

What are natural sources of minerals?

Answer 19

forage plants = grains fair source of P and low in others
lots pf phosphorus present in grains = phytate in the grain = can be utilized by ruminants = not well in non ruminants
s

Question 20

What is added in swime and poultry diet
?

Answer 20

phytase enzyme = splits phosphorus from phytate

= facilitates the hydrolysis to plant phytate and releases is P for utilization

Question 21

What are the importantt functtions of mineralss?

Answer 21

structural - primary component of bones and teeth
activators or components of enzyme systems
- maintain of osmotic pressure = regulate exchange of water and solutess within the animal body (Na,Cl and K)
- constituents of organic compounds = proteins and lipidss