Formulation supplementary feed for milk production
Its energy, crude protein, Ca and P content should be identical to
those of milk.
The nutrient content of 1 litre milk containing 4% fat are: 3.1
MJ NEl, 87g crude protein.
Therefore the protein to calorie ratio (PCR) of the
supplementary feed should also be 28 (87/3.1).
(28-PCRl) x NEll
The formula: p = ------------------------------(PCRh-28) x NElh
Where: p = the amount of protein concentrate (PCR>28)
should be given to 1 kg energy source (cereal grain) (PCR<28)
PCRl= PCR value of the energy source
PCRh= PCR value of the protein concentrate
NEll= NEl content of the energy source
NElh= NEl content of the protein concentrate
Formulation supplementary feed for milk production
Example:
d.m.
NEl c. protein. Ca
(g/kg) (MJ/kg d.m.)
(g/kg d.m.)
corn
912
8.57
103
0.2
extr. sunflower meal
896
6.38
412
2.3
P
3.5
NEl
(MJ/kg)
7.82
10.3
5.72
c. protein
94
Ca
(g/kg)
0.18
369
2.1
(28-12) x 7.82
p = ----------------------- = 0.6
(64.5 – 28) x 5.72
So, 0.6 kg sunflower meal has to be given to 1 kg corn.
1 kg corn + 0.6 kg sunflower = 1.6 kg;
1/1.6 = 63% corn
0.6/1.6 = 37% sunflower
P
PCR
3.2
12
9.2
64.5
Formulation supplementary feed for milk production
How much should be given from this feed for one litre milk?
0.63 kg corn
0.37 kg sunflower
In 1 kg feed
Needed for 1 litre milk
NEl
(MJ)
4.93
2.12
7.05
3.1
crude protein
(g)
59
137
196
87
Ca
(g)
0.11
0.78
0.89
2.8
P
(g)
2.0
3.4
5.4
1.7
So for 1 litre milk 3.1/7.05; or 87/196 = 0.44 kg feed needed
Controlling the Ca and P levels
1kg feed contains
0.44 kg feed
requirement :
Ca (g)
0.89
0.39
2.8
P (g)
5.4
2.37
1.7
The 2.41 g calcium deficit can be supplemented by limestone. 1kg limestone contains 380g
Ca (see the table). So, for supplementing 1 g Ca 2.6 g limestone (1000/380) should be given.
So, to 0.44 kg feed 6.27 g (2.41 x 2.6) limestone should be given. Each kg of feed needs
14.25 g (6.27/0.44) limestone supplementation.
Exercise
Prepare supplementary feed for milk production using wheat and soybean meal!
The milk contains 4% fat and 3.3% protein.
How much needed from this feed for one litre milk?
Control the Ca and P level of the feed, use supplementation if needed!
d.m.
NEl c. protein. Ca
(g/kg) (MJ/kg d.m.)
(g/kg d.m.)
wheat
extr. soybean
meal
P
NEl
(MJ/kg)
c. protein
Ca
(g/kg)
P
PCR
Exercise
How much should be given from this feed for one litre milk?
NEl
(MJ)
crude protein
(g)
Ca
(g)
kg wheat
kg soybean
In 1 kg feed
Needed for 1 litre milk
So for 1 litre milk ............................................................kg feed needed
Controlling the Ca and P levels
1kg feed contains
.............. kg feed
requirement :
Ca (g)
P (g)
2.8
1.7
P
(g)
Exercise
A 650 kg weight milking cow, kept in medium quality pasture,
produce milk with 3,8% fat and 3,3% protein.
The daily ration contains the following nutrients:
dry matter :
NEl
crude protein:
crude fibre:
16,5 kg
105,5 MJ
2133 g
3135 g
How much milk can be produced from this ration?