Mark Hanigan

Mark Hanigan

Professor of Animal Science / Virginia Tech
Articles

ARTICLES

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The cost of underfeeding and overfeeding protein for dairy producers

Protein is a costly ration component; precise balancing protects milk production and margins, while over- or underfeeding wastes money. Managed accurately, protein is an investment – not insurance.
January 14, 2026
Leticia Campos, Mark Hanigan, and Izabelle Teixeira

Protein is one of the most expensive nutrients in a dairy ration on a per-unit basis, and it is also one of the easiest places to lose money when diets are not balanced precisely.


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Notable changes to the NASEM dairy nutrient requirements software

The new NASEM report represents an update of the 2001 findings with major revisions for intake predictions, macro-nutrient digestion, macro-nutrient requirements for calves and heifers and amino acid requirements for cows.
November 23, 2022
Mark Hanigan and Jacquelyn Prestegaard-Wilson

The most recent report on dairy cattle nutrient requirements was published by the National Academies of Science, Engineering and Medicine (NASEM) in December 2021.


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