Name ________________
Animal Science 320
Fall 2012
Problem Set 4
Due October 3
1. Given the requirements below, balance the diets for the crude protein requirements of
growing pigs in the following weight ranges using corn grain and soybean meal. Then
check the diets of adequacy of Crude protein, Lysine, Methionine, and Tryptophan at
each weight range. Show all work
Requirements:
Crude protein
Lysine
20.9
18.0
1.15
0.95
Weight range,
lb
22 to 44
44 to 110
Methionine
% as-fed
0.3
0.25
Tryptophan
0.21
0.17
Feed composition:
Crude protein
Lysine
9.1
44.0
0.3
2.8
Corn
Soybean meal
Methionine
% as-fed
0.2
0.6
Tryptophan
0.1
0.6
Weight range 1:
Amount
Lb as-fed
Lysine
CP
Corn
SBM
Total
Requirements,
% as-fed
-
1
Methionine
Tryptophan
Weight range 2:
Amount
Lb as-fed
Lysine
CP
Methionine
Tryptophan
Corn
SBM
Total
Requirements,
% as-fed
-
2. Because lysine is the limiting amino acid in swine diets, the total amount of protein in pig
diets can be decreased by lysine supplementation. Calculate the crude protein and lysine
concentrations of a protein supplement containing 98.6% soybean meal and 1.4% Lysine
HCl on an as-fed basis. Then given the requirements below, balance the diets for the
lysine requirements of growing pigs in the following weight ranges using corn grain and
this protein supplement. Then check the diets of adequacy of Crude protein, Lysine,
Methionine, and Tryptophan. Show all work.
Requirements:
Crude protein
Lysine
Methionine
Tryptophan
Weight range,
% as-fed
lb
22 to 44
20.9
1.15
0.3
0.21
44 to 110
18.0
0.95
0.25
0.17
Feed composition:
Corn
Soybean meal
Lysine-HCl
Crude protein
Lysine
9.1
44.0
95.8
0.3
2.8
78.8
98.6%
SBM:1.4%
Lysine HCL
2
Methionine
% as-fed
0.2
0.6
0
Tryptophan
0.1
0.6
0
Weight range 1:
Amount
CP
Lb as-fed
Lysine
Methionine
Tryptophan
CP
Lb as-fed
Lysine
Methionine
Tryptophan
Corn
SBM
Lysine HCl
Total
Requirements,
% as-fed
Weight range 2:
-
Amount
Corn
SBM
Lysine HCl
Total
Requirements,
% as-fed
-
3
3. When balancing rations in practice, usually more than two nutrients need to be
considered. In this case, ingredients that aren’t being considered to balance the primary
nutrient should considered to be fixed ingredients. A good example of this involves
leaving space in the ration for the necessary mineral and vitamin supplements. Given the
requirements below,
A. Balance the diets for the crude protein requirements of growing pigs in the
following weight ranges using corn grain and soybean meal on an as-fed basis
assuming 2% fixed ingredients.
B. Then calculate how much dicalcium phosphate is needed to meet the pigs’
phosphorus requirements
C. Then calculate how much limestone is needed to meet the pig’s requirements for
calcium
D. Then add 0.25% salt and 0.1% trace mineral/vitamin premix on an as-fed basis.
E. Then check the diets of adequacy of Crude protein, Lysine, Calcium, and Phosphorus.
Do all work on the following pages.
Requirements:
Crude protein
Weight range,
lb
22 to 44
44 to 110
Lysine
Calcium
Phosphorus
0.7
.6
0.6
0.5
% as-fed
20.9
18.0
1.15
0.95
Feed composition:
Crude protein
Lysine
Calcium
Phosphorus
0.03
0.3
37
22
0.3
0.7
0
18
% as-fed
Corn
Soybean meal
Limestone
Dicalcium
phosphate
9.1
44.0
0
0
0.3
2.8
0
0
4
Weight range 1:
a. Calculate adjusted CP concentration
b. Balance Corn and SBM for adjusted CP
c. Calculate amounts of dicalcium phosphate and limestone needed and add salt and
trace mineral/vitamin premix
Lb, as-fed basis
Total fed
CP
Lysine
Calcium
Phosphorus
Requirement
100
Corn
Soybean meal
Phosphorus needed from Dicalcium phosphate
Dicalcium
phosphate
Calcium needed from Limestone
Limestone
Salt
Premix
Total
*Do not include values from shaded squares in diet totals.
5
Weight range 2:
a. Calculate adjusted CP concentration
b. Balance Corn and SBM for adjusted CP
c. Calculate amounts of dicalcium phosphate and limestone needed and add salt and
trace mineral/vitamin premix
Lb, as-fed basis
Total fed
CP
Lysine
Calcium
Phosphorus
Requirement
100
Corn
Soybean meal
Phosphorus needed from Dicalcium phosphate
Dicalcium
phosphate
Calcium needed from Limestone
Limestone
Salt
Premix
Total*
*Do not include values from shaded squares in diet totals.
6
-
4. Often some of the fixed ingredients will contribute to the primary nutrient. Therefore,
their contribution must be subtracted from the requirement before balancing the primary
nutrient. Although this could occur when balancing the ration for any species, a good
example is considering the contribution of animal protein concentrates to the diet of
growing pigs before balancing the corn and soybean meal. Given the requirements below,
a. Balance the diets for the lysine requirements of growing pigs in the following
weight ranges using corn grain and soybean meal on an as-fed basis, assuming that
each diet will contain 4% fish meal, 3% spray-dried animal plasma, and 1.5% other
fixed ingredients.
b. Then calculate how much dicalcium phosphate is needed to meet the pigs’
phosphorus requirements
c. Then calculate how much limestone is needed to meet the pig’s requirements for
calcium
d. Then add 0.25% salt and 0.1% trace mineral/vitamin premix on an as-fed basis.
e. Then check the diets of adequacy of Crude protein, Lysine, Methionine, Calcium, and
Phosphorus. Do all work on the following pages.
Requirements:
Crude
protein
Weight
range, lb
22 to 44
44 to 110
Lysine
Methionine
Calcium
Phosphorus
% as-fed
20.9
18.0
1.15
0.95
.3
.25
0.7
.6
0.6
0.5
Crude
protein
Lysine
Methionine
62
78
4.8
6.8
1.8
.7
5.2
.15
3.0
1.5
9.1
44.0
0.3
2.8
.2
.6
0.03
0.3
0.3
0.7
0
0
0
0
0
0
37
22
0
18
Feed composition:
Calcium
Phosphorus
% as-fed
Fish meal
Spray-dried
blood plasma
Corn
Soybean
meal
Limestone
Dicalcium
phosphate
7
Weight range 1.
a. Adjust lysine requirement for lysine from fixed ingredients
Lb, as-fed
Feed
CP
Lysine
Methionine
intake
Amounts
required
Fish meal
Spray-dried
plasma
Other fixed
ingredients
Amounts
needed
corn/SBM mix
Adjusted
lysine
concentration
needed in
corn/SBM mix
-
Ca
P
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Balance for adjusted lysine concentration in corn/SBM mix:
8
b, c, d, and e. Calculate amounts of dicalcium phosphate, limestone, salt and trace
mineral/vitamin Pre-mix required and check for adequacy.
Lb, as-fed
Total fed
CP
Lysine
Methionine
Ca
P
Amounts
required
Fish meal
Spray-dried
plasma
Corn grain
Soybean
meal
Amount of supplemental P needed from Dicalcium phosphate
Dicalcium
phosphate
Amount of supplemental Ca needed from Limestone
Limestone
Salt
Premix
Total*
Requirements
*Do not include values from shaded squares in diet totals.
9
-
Weight range 2.
b. Adjust lysine requirement for lysine from fixed ingredients
Lb, as-fed
Feed
CP
Lysine
Methionine
intake
Amounts
required
Fish meal
Spray-dried
plasma
Other fixed
ingredients
Amounts
needed
corn/SBM mix
Adjusted
lysine
concentration
needed in
corn/SBM mix
-
Ca
P
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Balance for adjusted lysine concentration in corn/SBM mix:
10
b, c, d, and e. Calculate amounts of dicalcium phosphate, limestone, salt and trace
mineral/vitamin Pre-mix required and check for adequacy.
Lb, as-fed
Total fed
CP
Lysine
Methionine
Ca
P
Amounts
required
Fish meal
Spray-dried
plasma
Corn grain
Soybean
meal
Amount of supplemental P needed from Dicalcium phosphate
Dicalcium
phosphate
Amount of supplemental Ca needed from Limestone
Limestone
Salt
Premix
Total*
Requirements
*Do not include values from shaded squares in diet totals.
11
-