Using the CNCPS model to evaluate forage supplements for grazing dairy cows

Abstract

The Cornell Net Carbohydrate and Protein System (CNCPS) model was used to evaluate pasture, maize, lotus, and sulla silage supplements for grazing dairy cows. Base data were obtained from a New Zealand study comparing six dietary treatments. Each treatment consisted of 10 cows and included one ad libitum pasture allowance treatment and a restricted pasture allowance treatment. These data plus digestion kinetic information were used as inputs to the CNCPS model to determine the first-limiting nutrient and to provide information concerning rumen digestion parameters. The value of these silages as either supplementary or complementary feeds for grazing dairy cows was identified.