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Potential for 20 % improvement in efficiency of protein use for milk production by amino acid balancing

Published on: 10/14/2019
Author/s : Claudia Parys

Research conducted at the US Dairy Forage Research Center in Madison (WI) has shown the potential for improving milk nitrogen (N) efficiency by more than 20 % through balancing amino acids and reducing crude protein levels fed. Milk nitrogen efficiency is a measure of how much of the protein (hence nitrogen) fed appears in milk versus being wasted and posing environmental challenges. Experimental...

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shimon carmi shimon carmi
zootechnoligy inginer
October 14, 2019

What was the performance of the cows?

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Claudia Parys Claudia Parys
Ruminant Nutritionist - Global Technical Support
Evonik Animal Nutrition Evonik Animal Nutrition
Hessen, Germany
April 3, 2020
shimon carmi
Milk yield was 41 kg/d with 3.5% fat and 3% true protein.
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shimon carmi shimon carmi
zootechnoligy inginer
April 4, 2020

We in Israel use 16.2-16.7 % CP depending on MUN looking to achieve 12-16 MUN flat TMR the entiere lactation as roughage is very expensive.
We do not use ruman protected amino acids but the TMR is much more diverce in protien feedstufs than the Wisconsin diet. We use soy, canola, DDGS, sunflower mill as protein sources, so we are not sure that the Mepron or AminoShure-XM can help improve nitrogen efficiency.

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Syeedmojtaba Syeedmojtaba
Animal Nutritionist
April 28, 2020
well done
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Brian Sloan Brian Sloan
Global Ruminant Business Director
Adisseo Adisseo
Oost-Vlaanderen, Belgium
May 3, 2020
In a follow up experiment with the same team at USDA Wisconsin, a Negative Control treatment was also included to allow a better assessment of what part of the improvements in N-efficiency were simply due to reducing N intake and what part were due to an improvement in performance through amino acid balancing.

Effect of feeding different sources of rumen-protected methionine on milk production and N-utilization in lactating cows : Chen et al J. Dairy Sci. 94 : 1978-1988

Lowering CP content in the ration from 16.8% to 15.6% without any attempt to amino acid balance, did not reduce milk protein but did reduce milk fat. N-efficiency (Milk N/N intake %) was improved from 30.2 to 32.4 (+7.3%). When Smartamine M was added to the 15.6% ration to respect a metabolizable LYS to MET ratio according to NRC 2001 of 3 to 1, daily milk fat yield was improved by 200 grams and milk protein by 90 grams, pushing the N-efficiency up to 34.2 (+13.2% vs the 16.9% CP ration)

Judicious use of Amino acid balancing to lower ration CP levels can improve performance and improve efficiency of N use essential in our goals of sustainable production.

The objective should be to reach at least 40% of intake N being converted into productive N
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Kurt A. Rosentrater
Kurt A. Rosentrater
Associate Professor
  Ames, Iowa, United States
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