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THE MANAGER

ReseaRch Update

The latest version of the Cornell Net Carbohydrate and Protein System contains new biology and whole-farm interface

By Mike Van Amburgh, Larry Chase and Tom Overton

CNCPS gets an update

The Cornell Net Carbohydrate and Protein System (CNCPS) has been in development for nearly 30 years, with various versions or implementations ­ CPM Dairy, AMTS.Cattle or Dalex ­used to evaluate and formulate rations for over 10 years. The new version ­ CNCPS 6.1 ­ is currently in beta test and available at www.cncps.cornell.edu/ downloads.htm. Release is expected late this summer or early fall. CNCPS 6.1 contains new biology and a wholefarm interface. This creates flexibility to set up multiple barns within a dairy and multiple groups within barns to more easily evaluate feed requirements and nutrient excretions across barns or the whole dairy.

What's new

Changes and updates in the biology of the CNCPS have been incorporated into the new version. These changes include: New passage rate equations and adjustments to passage assignments.

Expansion of feeds' carbohydrate fractions. Improvements in the prediction of how different protein fractions in feeds are broken down in the rumen and pass from the rumen to the intestine for potential absorption. From testing and field use, we've learned several things about how the CNCPS 6.1 predicts responses from various types of rations: 1. It appears to better account for protein metabolism and performance of cows fed diets with higher quality alfalfa or grass hay or haylage in which the soluble protein is mostly true protein rather than nonprotein nitrogen. 2. Compared to more recent releases, it will predict more metabolizable protein supply from the same ration. This means the model will predict more protein-allowable milk from the same ration than previous versions. Given this, users can formulate rations that support the same amount of milk with a lower ration crude protein. Remember, however, you'll still need high quality rumen undegradable (escape) protein sources to support high levels of milk production. But the model more accurately predicts requirements for rumen degradable protein from sources such as haylage and soybean meal. Given the high costs of purchased feed and protein sources, this may have implications for reducing feed costs on some farms. As CNCPS 6.1 is released, we'll work with feed industry professionals and consultants to help identify opportunities for implementation of the model as a stand-alone program or within other commercially available nutrition software. Our ultimate goal is to help dairies optimize feed cost and decrease nutrient excretion. xz

FYI

Mike Van Amburgh ([email protected]) is associate professor, Larry Chase ( [email protected]) is professor and Tom Overton ([email protected]) is associate professor in the Department of Animal Science at Cornell University. The website for version 6.1 of CNCPS is www.cncps. cornell.edu/downloads.htm

22 Northeast DairyBusiness · PRO-DAIRY

June 2008

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