Agriculture Reference
In-Depth Information
80
70
60
50
40
30
20
10
0
Whey
Maize
Wheat
Barley
Peas
Rapeseed
cake
Soybean
meal
Fish
meal
Fig. 3.4.
Crude protein concentration, percentage in commonly used feedstuffs (as-fed basis)
(Nørgaard, 2012).
60
50
40
30
20
10
0
Whey
Maize
Wheat
Barley
Peas
Rapeseed
cake
Soybean
meal
Fish
meal
Lysine
Valine
Fig. 3.5.
Examples of amino acid concentrations in commonly used feedstuffs, g kg
−1
(as-fed basis)
(Nørgaard, 2012).
introduced in e.g. the EC. Local demands for spe-
cific low-ammonia housing systems for livestock
have been established. However, all things being
equal, the focus on reductions in N excretions by
feeding means has also decreased the emission
of ammonia. Ammonia emission (housing and
manure storage facilities) from the production of
monogastric animals has been covered in many
papers and reviews (e.g. Monteny and Hartung,
2007) and will not be discussed further.
In summary, two major factors are the driv-
ing forces behind the improvement in N use in
