Nutrition lecture 6 - Protein
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Why do we need protein?
To supply AA to build things
What is unque about proteins as a nutrient?
Because of BSE what restriction do we have on animal protein
No feeding ruminant protein to ruminants
Why dont we want to use protein as eneergy? Is it possible?
Yes it is possible but it is the most expensive form in terms of $
What are the main protein sources in monogastrics? Contrast this to ruminants
- Oilseed meals such as soy abd canola as well as legumes such as peas and lentils or animal by products
- In ruminants it can be any of the above but is often in the form of good hay and urea supplementation
Do ruminants often care of the quality of the protein source?
Not in the same way that monos do, because the bacteria just break everything down to ammonia anyways it doesnt really matter cause it is the bacterial protein that ends up digested anyways
How are cereal grains in terms of protein? What does this mean for diet formulation?
- Low and poorly balanced
- Need to be supplemented with another ingredient better in AA
Proteins are polymer ofs?
What bond holds Proteins together?
What can make proteins difficult to digest?
Tertiary structure can be very folded and therefore difficult for digestive enzymes to break down
Why do we need so many enzymes to break down a protein?
Need to be able to break down all different types of peptide bonds
What are the 2 main factors affecting protein qualioty?
What are 5 factors that affect protein digestibility
- Fiber (coats it)
- Type of protein
- AA balance
- Heat treatment
- Anti nutritional factors
Too much heating of proteins and what will happen?
Maillard reaction products (carb binds it very tightly, un utilizable)
What are the 10 essential amino acids?
M.V PITT HALL
What extra essential AA do cats have?
Do ruminants have essential AA?
No the bacteria make everything for them
Most often the 1st limiting amino acid is?
REMEMBER THE STAVES IN THE BARRELL EXAMPLE OF 1ST LIMITING AA
Why dont we often use fish meal?
- IMparts a fishy taste
- way to expensive
Give 4 good examples of uses for proteins
- Growth of new tissue
- Repair fo ol tissue
What are the 2 main sites of protein digestion?
Stomach and small intestine
What digests proteins in the stomach? And they do what specifically
- Pepsin and HCL
- Shorten the protein
What is the main protein digesters in the smll intestine? They do what primarily
- Break down to dipeptides and single AA
What do we do when we feel the bacteria are not letting the ruminant have enough protein?
We use bypass protein
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