The Tractor Engine Example

When buying a tractor (or a car for that matter) it is not just the engine size that is looked at but also the horse power.

Comparing this to the proteins in the compounds and blends, we can liken the litre size odf the engine to the crude protein in the feed. The crude protein is driven by the MPN value – the higher the MPN, the higher the crude protein.

However, for a given engine size in litres, there can be many horse power ratings. The table below is taken from the Massey Ferguson brochure to serve as an example.

massey-ferguson-engines.png

These are all 6 cylinder, 6.6 litre engine tractors. Just like we could have a range of 20% crude protein compounds or blends. The horse power ratings, in this case from 132-185 would be the MPE value in the feed. All the same engine size, quite different in what they will give out.

Just like compounds -  they may have the same crude protein content, but vary markedly in their MPE rating. This is not declared on the label (only the crude protein is). It is the MPE that drives the milk production.

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