Nutrient Requirements
What is optimal feeding rate following?
"Marginal Rate of Return"
In humans, dietary reference intakes here previously referred to as what?
"Recommended Daily Allowances"
RDA is expressed as a what?
% (coefficient)
What did the NRC Committees view as important factors affecting nutrient requirements?
- 1984 Nutrient Requirements of Beef Cattle - 2006 Nutrient Requirements of Dogs and Cats - 1989 Nutrient Requirements of Horses (see in-class worksheet)
What do DRI's include?
-EAR -RDA -AI -UL
What is the AI?
-cannot determine any other requirement so determine what is assumed to be "adequate" -is the recommended avg. daily intake level based on observed or experimentally determined approximations or estimates of nutrient intake by a group (or groups) of apparently healthy...
What 2 things must you know to determine the RDA?
1) know the requirement 2) know the variance around the requirement
What do you need to know to determine EAR?
1) the requirement
What does AI stand for?
Adequate Intake
What complex is Co a part of?
B12 (cobalamin)
In humans, dietary reference intakes are now referred to as what?
DRI's
What do DRI's stand for?
Dietary Reference Intakes
What does EAR stand for?
Estimated Average Requirement
True or False: Males deposit more protein and more fat and are therefore larger than females.
False: males deposit more protein & LESS fat
What does RDA stand for?
Recommended Dietary Allowance
True or False: There is no minimum requirement for fat.
True
What does UL stand for?
[Tolerable] Upper Intake Level
Which nutrient is involved in the fracking process? How does it affect it?
choline; increasing cost (economic circumstances)
Nutrient intakes represent a _____________.
continuum
As animals mature, what happens to the rates of protein deposition?
declines
Feed restriction reduces _____ deposition and increases __________ deposition.
fat; protein
As animals mature, what happens to the rates of fat deposition?
increase
How do you determine the requirement for EAR?
it's the same as the average for the group (50% of the population)
High protein means _____ fat.
low
Do humans have a nutrient requirement for Co?
no
What are the major factors affecting nutrient requirements?
physiological state & climate
What is the RDA?
the avg. daily dietary nutrient intake level sufficient to meet the nutrient..
What is the EAR?
the avg. daily nutrient intake level estimated to meet the requirement of HALF the healthy individuals in a particular...
What is the UL?
the highest avg. daily nutrient intake level that is likely to pose no risk of adverse health effects to almost all individuals in the general population
What is UL similar to?
toxicity level
Nutrient requirements are __________.
variable
When is feeding rate optimal?
when change in cost is equal to change in value ("Marginal Rate of Return" equals 1)