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Published online by Cambridge University Press: 24 November 2017
The profitable management of milk production in relation to quota would be greatly aided by an ability to predict responses in milk constituent output to changes in feeding. One pre-requisite for doing so is a knowledge of substitution rates between feeds. The trials described here were the first in a series to aid the development of a mathematical model embracing the inter-relationships between forage quality and type, concentrate level and type, and milk outputs. The objective was to explore further the impact of silage type and quality and a wide range of concentrate level on substitution rate and milk constituent output.