CNCPS Biology Model

Cornell Net Carbohydrate and Protein System (CNCPS) was developed and licensed by Cornell University Ruminant Nutrition Modeling Group. AMTS products use the latest version of CNCPS – version 6.5. By obtaining the license to the CNCPS model, AMTS can guarantee that the model is implemented exactly as developed.

Models like the CNCPS are mechanistic models where nutrient utilization, primarily in the rumen, is described by a series of research derived, non-linear equations. Instead of having an NEL(Net Energy of Lactation) and a RUP (Rumen Undegradable Protein) value, feeds are described by their chemical fractions and fermentation characteristics. Then these “pools” are degraded (kd(digestion rate) / (kd + kp(passage rate))) and a microbial yield is predicted. Given differences in animal types, diets, etc., the total ME (Metabolizable Energy) and MP (Metabolizable Protein) is calculated for a diet. This is then partitioned to the animal requirements (maintenance, pregnancy, milk, growth, and reserves). What this allows us to do is more accurately define the diets. In today’s economic conditions and under today’s environmental scrutiny, this increased accuracy allows us to remove ration ‘safety factors’ that, in the past, led to nutrient overfeeding and greater environmental losses.

Proper use of the model has been shown via research to:

  • improve cow health via
    • decreased acidosis (clinical and subclinical)
    • decreased laminitis and other foot problems
    • decreased metabolic diseases incidence
  • improve income over feed costs
  • reduce nitrogen and phosphorus excretion
  • improve animal performance (milk, meat, heifer growth, etc.)
  • improve milk components
  • place a higher farm awareness on forage quality

Key Points About the Nutritionist Series


The presentation is in English using the Zoom Webinars platform and approximately 60 minutes in length.


Spanish, Mandarin, and Portuguese language webinars are simultaneously translated and transmitted through other platforms.


Questions are fielded in all four languages and The flow of the talk is not interrupted for translation.


The audience is global—live attendees were primarily from the Western Hemisphere but also included European, Asian and African attendees.


The talks are non-commercial. They are offered at two times to enable convenient global participation.


Archived talks from 2015 through the present (as they are available) in English, are accessible by topic.

The Nutritionist

These multi language webinars are hosted in English by Mariann Fessenden of AMTS. Globally recognized educators, researchers, and nutritional practitioners speak on a variety of topics with 60 minute presentations. The talk is co-hosted in Spanish by Paula Turiello in Argentina; Tom Long hosts in Mandarin; and Elena Bonfante from Italy. Following the presentation, audience members from each webinar partner are able to ask questions. The webinars started in 2015. Recordings are archived, by year, for on-line listening, or on our vimeo site for downloading. All webinars are converted into podcasts.

Educational Webinars

In January 2017 the United States implemented a program focused on addressing the use of medications in feed animals that, if overused, could contribute to antibiotic resistance in human disease management. We held a webinar for nutritionist as animal caregivers that outlined the requirements for compliance. Dr. Melanie Hemenway for NYSCHAP spoke about the Veterinary Feed Directive on 22 March 2017. A recording of that webinar can be found here.



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