Lecture quiz 05/01/23 (monday)

Question 1

how do we calculate how much protein per gram in cat food?

Answer 1

100 (weight) X cru
weight X crude protein = grams of protein
protein peer gram =

Question 2

why is it important to put the moisture content in cat food?

Question 3

When water is given, how do we get dry matter?

Answer 3

100- moisture

Question 4

What should we know about when preparing for chemical/proximate analysis?

Answer 4

• dry 55-60C = only needed for high/wet moisture samples
• grind (1mm particle size)

Question 5

when do we use 105C when drying?

Answer 5

dry feedstuffs

Question 6

how do we do proximate analysis for ash?

Question 7

what represents the total mineral content of the feed?

Answer 7

ash

Question 8

what method do we use for ash?

Answer 8

combust at 500-600C for 4 hours

Question 9

how do we calculate ash%?

Answer 9

ash remaining wt/ sample wt x 100

Question 10

how do we get the organic matter in ash?

Answer 10

% organic matter = 100 - %ash

Question 11

what aree implications of ash content?

Answer 11

assh tellsss you nothing about the concentration of individual minerals
acts as diluent for other nutrients and enrgy

Question 12

What are the are sourcess of error in ash proximate analysis?

Answer 12

high temp may volatize ssome minerals (zinc, chlorine, selenium and iodine)

Question 13

is there energy in ash?

Answer 13

no it reduces energy intake

Question 14

is ash underestimated?

Answer 14

yess

Question 15

what do we use to combust ash?

Answer 15

muffle furnace then put in a desiccator

Question 16

what is a muffle furnace?

Answer 16

advanced high temp heating elements
programmable temperature controller
temp can go up to 1,200 celsius

• we use crucibles because they are resistant to high temps

Question 17

what does it mean when we say ash is a diluent?

Answer 17

more ash = less of other things (nutrients)

Question 18

what does it mean if ther is more than 12% of ash in feedstuff in horses?

Answer 18

over 12% is alarming not baad but low energy

Question 19

Proximate analysis of ether extract

Answer 19

fat is soluble in ether = extract fat
- EE is supposed to represent the lipids in a feedstuff

Question 20

what is the method in EE?

Answer 20

reflux the sample with boiling ether to remove the fatt

Question 21

what is the calculation used in EE?

Answer 21

%EE = residue after evaporation of ether/ sample wt X 100

Question 22

what are the implications of EE conc?

Answer 22

• EE represents the fraction of feed with the highest energy value, Higher ether extract should imply that the feed has high energy conc.

Question 23

what is the limitation of the procedure?

Answer 23

crude fat contains true fat - in addition it contains non-nutritive EE components (chlorophyll, pigments and waxes)

Question 24

If EE overestimated or underestimated?

Answer 24

Overestimated the fat content

Question 25

what system do we use for crude fat analysis?

Answer 25

Automated Soxtec Extraction System

Question 26

Where are samples placed in for EE?

Answer 26

thimbles