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In an attempt to ensure there is enough MPE to meet the needs of the ration, balanced with the ME supply, many traditionally formulated compounds and blends will oversupply the MPN side of the equation.
Unless the MPE and MPN values are set as the constraints when making the compounds and blends (as they are in FiMLAC diets), a drive to increase the MPE will automatically increase the MPN at a greater rate. The crude protein is driven by the MPN of the feed, not the MPE. It is the MPE that drives milk production.
Example 1 - Balanced Ration (ExampleRationBalancedPtn PDF)
In this ration, the FiMLAC 120M is formulated to have minimum 120g/kg MPE and a maximum 145g/kg MPN (it happens to be about 21% crude protein, but that is by-the-by). This ration is well balanced, providing enough MPE to meet the requirements, in line with the energy supply (see the “Milk Yield Potential” figures at the bottom) and the Excess MPN is 255g/day.
Cows will milk to expectations and get back in calf.
Example 2 - Traditional 20% Nut (ExampleRationHighPtn PDF)
In this case, the compound was formulated to the crude protein content. As you can see, the MPE supply is not enough (“Milk Yield Potential” at the bottom of the page) to meet the requirements. The protein supply is about 3 litres short. On top of this, the type of compound that it is means that the excess MPN is also far too high at 468g/day.
Not enough milk produced and cows not holding to service.
Example 3 - High Protein (ExampleRationHighPtn2 PDF)
This example shows the result of adding even more protein “to get the cows milking” but highlights the longer term issues. The protein supply is now over done – almost 3 litres above the energy supply (“Milk Yield Potential” at the bottom of the page) that will produce milk alright but will start to strip body condition over time. The Excess MPN is also over the top at 370g/day.
Cows will milk but fertility will suffer with poor oestrus behaviour and not holding to service.
The FiMLAC range was started back In 2001 on the back of the DEFRA LINK study, Feed into Milk for Lactating cows.
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