Nutrition Flashcards
What is dry matter
Food substance without any moisture
Product left once the water has been removed
Factors influencing dry matter needed
Age Body condition Dentition Health problems Weight Gender Life stage
How to calculate dry matter
100- moisture content
Nutrient content divided by step one answer x 100= dry matter content of nutrient
Examples of dry matter calculations
100-8 =92. 20 divided by 92x 100= 21.74
100-8 =92. 5 divided by 92x 100= 5.43
What is metabolisable energy
Total potential energy after we account for energy lost in waste products
Proteins 3.5kcal
Fats 8.5 kcal
Carbohydrates 3.5kcal
How to calculate metabolisable energy
10[( 3.5x protein content) + (8.5x fat content) + (3.5x carbohydrates)]
Examples of metabolisable energy
10 [(3.5x 19) + (8.5x 10) + (3.5x 11)]
10x 66.5+85+38.5
10x 190= 1900
1.9kcal
What is RER
This is the measure of energy required by an animal in a thermometer neutral environment 12 hours after eating
How to calculate RER
Animals 2kg or over- (30 x weight in kg) +70
Animals under 2kg- 70 x (weight of the animal in kg to the power of (0.75)
Examples of RER calculation of an animal over 2kg
30 x 6 =180
180+ 70 =250kcal
Examples of a RER calculation for animals under 2kg
- 5 to the power of (0.75)= 0.6 rounded up
0. 6 x 70= 42kcal
What is gross energy
It is all the energy within feed products before accounting for losses due to normal digestive and metabolic functions
How is gross energy determined
Determined by measuring the amount of heat produced when food products are oxidised in a bomb calorimeter
What are carbohydrates
Molecules made up of carbon hydrogen and oxygen atoms. They are an important source of energy
What are monosaccharides
Often called simple sugars. They include glucose galactose and fructose. These are absorbed quickly and easily by the body after eating. Glucose is the main source of energy and most carbohydrates are broken down into glucose during the digestion process. Monosaccharides are found naturally in fruit and honey
What are disaccharides
Two monosaccharides can combine to create a disaccharide for example sucrose, lactose and maltose.
Sucrose is made from glucose and fructose
Lactose is made from glucose and galactose
Maltose is made from glucose molecules
What are polysaccharides
Many monosaccharides joined together, also known as complex carbohydrates. They include starch, glycogen and cellulose.
Starch
Found in lots of foodstuff such as rice cereals grains and bread. It is made from a form of glucose called alpha glucose it is broken down into glucose during digestion but because it is a complex carbohydrate the process takes much longer
Glycogen
Is created in the body from glucose and is essentially a store of energy. When the body needs energy it can draw upon its glycogen store and break it down into glucose
Cellulose
Made from beta glucose. Makes up the cell walls in plants. It cannot be digested by humans and most animals however ruminant animals have a chamber in their stomach containing bacteria and Protozoa that can break this cellulose into fatty acids which is then digestible. Cellulose is the main source of energy for ruminants. For other animals cellulose is still useful as it ascots as a source of dietary fibre
Proteins
Very long chains of 50 or more amino acids. Proteins can be used by the body as a source of energy if other sources have run out. Excess protein is not stored in the body however it is converted into urea and excreted from the body in urine
What are peptides
Combination of two or more amino acids
What are dipeptide
Specific term for when two amino acids combine
What are polypeptides
When three or more amino acids combine
Amino acids
There are 21 different amino acids which make up proteins that humans and animals need. Proteins are the workhorses of the body and perform many different functions at a cellular level
Fats and pipes
A group of molecules known as fatty acids consists of long chains of hydrogen and carbon atoms arranged in different ways. Fatty acids chemically combine with a molecules called glycerol to form fats